diff --git a/src/agents/agent-scope.test.ts b/src/agents/agent-scope.test.ts
index 585c7bca90..bc06bde9ce 100644
--- a/src/agents/agent-scope.test.ts
+++ b/src/agents/agent-scope.test.ts
@@ -57,7 +57,7 @@ describe("resolveAgentConfig", () => {
         defaults: {
           model: {
             primary: "anthropic/claude-sonnet-4",
-            fallbacks: ["openai/gpt-4.1"],
+            fallbacks: ["openai/gpt-5-nano"],
           },
         },
         list: [
diff --git a/src/agents/model-fallback.test.ts b/src/agents/model-fallback.test.ts
index ea846eabbe..dbffd54810 100644
--- a/src/agents/model-fallback.test.ts
+++ b/src/agents/model-fallback.test.ts
@@ -8,7 +8,7 @@ function makeCfg(overrides: Partial<ClawdbotConfig> = {}): ClawdbotConfig {
     agents: {
       defaults: {
         model: {
-          primary: "openai/gpt-4.1-mini",
+          primary: "openai/gpt-5-nano",
           fallbacks: ["anthropic/claude-haiku-3-5"],
         },
       },
@@ -29,7 +29,7 @@ describe("runWithModelFallback", () => {
       runWithModelFallback({
         cfg,
         provider: "openai",
-        model: "gpt-4.1-mini",
+        model: "gpt-5-nano",
         run,
       }),
     ).rejects.toThrow("bad request");
@@ -46,7 +46,7 @@ describe("runWithModelFallback", () => {
     const result = await runWithModelFallback({
       cfg,
       provider: "openai",
-      model: "gpt-4.1-mini",
+      model: "gpt-5-nano",
       run,
     });
 
@@ -68,7 +68,7 @@ describe("runWithModelFallback", () => {
     const result = await runWithModelFallback({
       cfg,
       provider: "openai",
-      model: "gpt-4.1-mini",
+      model: "gpt-5-nano",
       run,
     });
 
@@ -92,7 +92,7 @@ describe("runWithModelFallback", () => {
     const result = await runWithModelFallback({
       cfg,
       provider: "openai",
-      model: "gpt-4.1-mini",
+      model: "gpt-5-nano",
       run,
     });
 
@@ -129,7 +129,7 @@ describe("runWithModelFallback", () => {
       agents: {
         defaults: {
           model: {
-            primary: "openai/gpt-4.1-mini",
+            primary: "openai/gpt-5-nano",
           },
         },
       },
@@ -173,13 +173,13 @@ describe("runWithModelFallback", () => {
       cfg,
       provider: "anthropic",
       model: "claude-opus-4-5",
-      fallbacksOverride: ["openai/gpt-4.1"],
+      fallbacksOverride: ["openai/gpt-5-nano"],
       run: async (provider, model) => {
         calls.push({ provider, model });
         if (provider === "anthropic") {
           throw Object.assign(new Error("nope"), { status: 401 });
         }
-        if (provider === "openai" && model === "gpt-4.1") {
+        if (provider === "openai" && model === "gpt-5-nano") {
           return "ok";
         }
         throw new Error(`unexpected candidate: ${provider}/${model}`);
@@ -189,7 +189,7 @@ describe("runWithModelFallback", () => {
     expect(res.result).toBe("ok");
     expect(calls).toEqual([
       { provider: "anthropic", model: "claude-opus-4-5" },
-      { provider: "openai", model: "gpt-4.1" },
+      { provider: "openai", model: "gpt-5-nano" },
     ]);
   });
 
@@ -234,7 +234,7 @@ describe("runWithModelFallback", () => {
     const result = await runWithModelFallback({
       cfg,
       provider: "openai",
-      model: "gpt-4.1-mini",
+      model: "gpt-5-nano",
       run,
     });
 
@@ -254,7 +254,7 @@ describe("runWithModelFallback", () => {
     const result = await runWithModelFallback({
       cfg,
       provider: "openai",
-      model: "gpt-4.1-mini",
+      model: "gpt-5-nano",
       run,
     });
 
@@ -269,7 +269,7 @@ describe("runWithModelFallback", () => {
       agents: {
         defaults: {
           model: {
-            primary: "openai/gpt-4.1-mini",
+            primary: "openai/gpt-5-nano",
             fallbacks: [],
           },
         },
@@ -292,6 +292,6 @@ describe("runWithModelFallback", () => {
     expect(result.result).toBe("ok");
     expect(run).toHaveBeenCalledTimes(2);
     expect(result.provider).toBe("openai");
-    expect(result.model).toBe("gpt-4.1-mini");
+    expect(result.model).toBe("gpt-5-nano");
   });
 });
diff --git a/src/agents/model-selection.test.ts b/src/agents/model-selection.test.ts
index c054d64b87..73e59da276 100644
--- a/src/agents/model-selection.test.ts
+++ b/src/agents/model-selection.test.ts
@@ -13,8 +13,8 @@ import {
 const catalog = [
   {
     provider: "openai",
-    id: "gpt-4",
-    name: "GPT-4",
+    id: "gpt-5-nano",
+    name: "GPT-5 Nano",
   },
 ];
 
@@ -24,7 +24,7 @@ describe("buildAllowedModelSet", () => {
       agents: {
         defaults: {
           models: {
-            "openai/gpt-4": { alias: "gpt4" },
+            "openai/gpt-5-nano": { alias: "gpt5nano" },
           },
         },
       },
@@ -38,7 +38,9 @@ describe("buildAllowedModelSet", () => {
     });
 
     expect(allowed.allowAny).toBe(false);
-    expect(allowed.allowedKeys.has(modelKey("openai", "gpt-4"))).toBe(true);
+    expect(allowed.allowedKeys.has(modelKey("openai", "gpt-5-nano"))).toBe(
+      true,
+    );
     expect(allowed.allowedKeys.has(modelKey("claude-cli", "opus-4.5"))).toBe(
       true,
     );
@@ -57,7 +59,9 @@ describe("buildAllowedModelSet", () => {
     });
 
     expect(allowed.allowAny).toBe(true);
-    expect(allowed.allowedKeys.has(modelKey("openai", "gpt-4"))).toBe(true);
+    expect(allowed.allowedKeys.has(modelKey("openai", "gpt-5-nano"))).toBe(
+      true,
+    );
     expect(allowed.allowedKeys.has(modelKey("claude-cli", "opus-4.5"))).toBe(
       true,
     );
@@ -236,7 +240,7 @@ describe("resolveAllowedModelRef", () => {
       agents: {
         defaults: {
           models: {
-            "openai/gpt-4": { alias: "GPT4" },
+            "openai/gpt-5-nano": { alias: "GPT5NANO" },
           },
         },
       },
@@ -244,12 +248,12 @@ describe("resolveAllowedModelRef", () => {
     const resolved = resolveAllowedModelRef({
       cfg,
       catalog: [
-        { provider: "openai", id: "gpt-4", name: "GPT-4" },
+        { provider: "openai", id: "gpt-5-nano", name: "GPT-5 Nano" },
         { provider: "anthropic", id: "claude-sonnet-4-1", name: "Sonnet" },
       ],
       raw: "anthropic/claude-sonnet-4-1",
       defaultProvider: "openai",
-      defaultModel: "gpt-4",
+      defaultModel: "gpt-5-nano",
     });
     expect(resolved).toEqual({
       error: "model not allowed: anthropic/claude-sonnet-4-1",
diff --git a/src/agents/pi-embedded-runner-extraparams.test.ts b/src/agents/pi-embedded-runner-extraparams.test.ts
index d1243da61f..b9e2a8d584 100644
--- a/src/agents/pi-embedded-runner-extraparams.test.ts
+++ b/src/agents/pi-embedded-runner-extraparams.test.ts
@@ -207,11 +207,11 @@ describe("resolveExtraParams", () => {
       expect(result).toBeUndefined();
     });
 
-    it("returns undefined for openai/gpt-4 with no config", () => {
+    it("returns undefined for openai/gpt-5-nano with no config", () => {
       const result = resolveExtraParams({
         cfg: undefined,
         provider: "openai",
-        modelId: "gpt-4",
+        modelId: "gpt-5-nano",
       });
 
       expect(result).toBeUndefined();
@@ -223,7 +223,7 @@ describe("resolveExtraParams", () => {
           agents: {
             defaults: {
               models: {
-                "openai/gpt-4": {
+                "openai/gpt-5-nano": {
                   params: {
                     logprobs: true,
                     top_logprobs: 5,
@@ -234,7 +234,7 @@ describe("resolveExtraParams", () => {
           },
         },
         provider: "openai",
-        modelId: "gpt-4",
+        modelId: "gpt-5-nano",
       });
 
       expect(result).toEqual({
diff --git a/src/auto-reply/reply.block-streaming.test.ts b/src/auto-reply/reply.block-streaming.test.ts
index 9a13e65cca..2ffdb1843e 100644
--- a/src/auto-reply/reply.block-streaming.test.ts
+++ b/src/auto-reply/reply.block-streaming.test.ts
@@ -42,7 +42,7 @@ describe("block streaming", () => {
     piEmbeddedMock.runEmbeddedPiAgent.mockReset();
     vi.mocked(loadModelCatalog).mockResolvedValue([
       { id: "claude-opus-4-5", name: "Opus 4.5", provider: "anthropic" },
-      { id: "gpt-4.1-mini", name: "GPT-4.1 Mini", provider: "openai" },
+      { id: "gpt-5-nano", name: "GPT-5 Nano", provider: "openai" },
     ]);
   });
 
diff --git a/src/auto-reply/reply.directive.test.ts b/src/auto-reply/reply.directive.test.ts
index fc499fd02b..efba1748f8 100644
--- a/src/auto-reply/reply.directive.test.ts
+++ b/src/auto-reply/reply.directive.test.ts
@@ -61,7 +61,7 @@ describe("directive behavior", () => {
     vi.mocked(loadModelCatalog).mockResolvedValue([
       { id: "claude-opus-4-5", name: "Opus 4.5", provider: "anthropic" },
       { id: "claude-sonnet-4-1", name: "Sonnet 4.1", provider: "anthropic" },
-      { id: "gpt-4.1-mini", name: "GPT-4.1 Mini", provider: "openai" },
+      { id: "gpt-5-nano", name: "GPT-5 Nano", provider: "openai" },
     ]);
   });
 
@@ -143,7 +143,7 @@ describe("directive behavior", () => {
         {
           agents: {
             defaults: {
-              model: "openai/gpt-4.1-mini",
+              model: "openai/gpt-5-nano",
               workspace: path.join(home, "clawd"),
             },
           },
@@ -1655,7 +1655,7 @@ describe("directive behavior", () => {
               workspace: path.join(home, "clawd"),
               models: {
                 "anthropic/claude-opus-4-5": {},
-                "openai/gpt-4.1-mini": {},
+                "openai/gpt-5-nano": {},
               },
             },
           },
@@ -1666,7 +1666,7 @@ describe("directive behavior", () => {
       const text = Array.isArray(res) ? res[0]?.text : res?.text;
       expect(text).toContain("anthropic/claude-opus-4-5");
       expect(text).toContain("Pick: /model <#> or /model <provider/model>");
-      expect(text).toContain("gpt-4.1-mini — openai");
+      expect(text).toContain("gpt-5-nano — openai");
       expect(text).not.toContain("claude-sonnet-4-1");
       expect(runEmbeddedPiAgent).not.toHaveBeenCalled();
     });
@@ -1687,7 +1687,7 @@ describe("directive behavior", () => {
               workspace: path.join(home, "clawd"),
               models: {
                 "anthropic/claude-opus-4-5": {},
-                "openai/gpt-4.1-mini": {},
+                "openai/gpt-5-nano": {},
               },
             },
           },
@@ -1697,7 +1697,7 @@ describe("directive behavior", () => {
 
       const text = Array.isArray(res) ? res[0]?.text : res?.text;
       expect(text).toContain("anthropic/claude-opus-4-5");
-      expect(text).toContain("openai/gpt-4.1-mini");
+      expect(text).toContain("openai/gpt-5-nano");
       expect(text).not.toContain("claude-sonnet-4-1");
       expect(text).toContain("auth:");
       expect(runEmbeddedPiAgent).not.toHaveBeenCalled();
@@ -1719,7 +1719,7 @@ describe("directive behavior", () => {
               workspace: path.join(home, "clawd"),
               models: {
                 "anthropic/claude-opus-4-5": {},
-                "openai/gpt-4.1-mini": {},
+                "openai/gpt-5-nano": {},
               },
             },
           },
@@ -1730,7 +1730,7 @@ describe("directive behavior", () => {
       const text = Array.isArray(res) ? res[0]?.text : res?.text;
       expect(text).toContain("Pick: /model <#> or /model <provider/model>");
       expect(text).toContain("claude-opus-4-5 — anthropic");
-      expect(text).toContain("gpt-4.1-mini — openai");
+      expect(text).toContain("gpt-5-nano — openai");
       expect(runEmbeddedPiAgent).not.toHaveBeenCalled();
     });
   });
@@ -1751,7 +1751,7 @@ describe("directive behavior", () => {
               workspace: path.join(home, "clawd"),
               models: {
                 "anthropic/claude-opus-4-5": {},
-                "openai/gpt-4.1-mini": {},
+                "openai/gpt-5-nano": {},
               },
             },
           },
@@ -1762,7 +1762,7 @@ describe("directive behavior", () => {
       const text = Array.isArray(res) ? res[0]?.text : res?.text;
       expect(text).toContain("Pick: /model <#> or /model <provider/model>");
       expect(text).toContain("claude-opus-4-5 — anthropic");
-      expect(text).toContain("gpt-4.1-mini — openai");
+      expect(text).toContain("gpt-5-nano — openai");
       expect(runEmbeddedPiAgent).not.toHaveBeenCalled();
     });
   });
@@ -1778,7 +1778,7 @@ describe("directive behavior", () => {
           id: "claude-opus-4-5",
           name: "Claude Opus 4.5",
         },
-        { provider: "openai", id: "gpt-4.1-mini", name: "GPT-4.1 mini" },
+        { provider: "openai", id: "gpt-5-nano", name: "GPT-5 Nano" },
       ]);
       const storePath = path.join(home, "sessions.json");
 
@@ -1792,7 +1792,7 @@ describe("directive behavior", () => {
               workspace: path.join(home, "clawd"),
               models: {
                 "anthropic/claude-opus-4-5": {},
-                "openai/gpt-4.1-mini": {},
+                "openai/gpt-5-nano": {},
                 "minimax/MiniMax-M2.1": { alias: "minimax" },
               },
             },
@@ -1813,7 +1813,7 @@ describe("directive behavior", () => {
 
       const text = Array.isArray(res) ? res[0]?.text : res?.text;
       expect(text).toContain("claude-opus-4-5 — anthropic");
-      expect(text).toContain("gpt-4.1-mini — openai");
+      expect(text).toContain("gpt-5-nano — openai");
       expect(text).toContain("MiniMax-M2.1 — minimax");
       expect(runEmbeddedPiAgent).not.toHaveBeenCalled();
     });
@@ -1853,7 +1853,7 @@ describe("directive behavior", () => {
       const storePath = path.join(home, "sessions.json");
 
       await getReplyFromConfig(
-        { Body: "/model openai/gpt-4.1-mini", From: "+1222", To: "+1222" },
+        { Body: "/model openai/gpt-5-nano", From: "+1222", To: "+1222" },
         {},
         {
           agents: {
@@ -1862,7 +1862,7 @@ describe("directive behavior", () => {
               workspace: path.join(home, "clawd"),
               models: {
                 "anthropic/claude-opus-4-5": {},
-                "openai/gpt-4.1-mini": {},
+                "openai/gpt-5-nano": {},
               },
             },
           },
@@ -1871,7 +1871,7 @@ describe("directive behavior", () => {
       );
 
       assertModelSelection(storePath, {
-        model: "gpt-4.1-mini",
+        model: "gpt-5-nano",
         provider: "openai",
       });
       expect(runEmbeddedPiAgent).not.toHaveBeenCalled();
@@ -1889,10 +1889,10 @@ describe("directive behavior", () => {
         {
           agents: {
             defaults: {
-              model: { primary: "openai/gpt-4.1-mini" },
+              model: { primary: "openai/gpt-5-nano" },
               workspace: path.join(home, "clawd"),
               models: {
-                "openai/gpt-4.1-mini": {},
+                "openai/gpt-5-nano": {},
                 "anthropic/claude-opus-4-5": { alias: "Opus" },
               },
             },
@@ -2209,10 +2209,10 @@ describe("directive behavior", () => {
         {
           agents: {
             defaults: {
-              model: { primary: "openai/gpt-4.1-mini" },
+              model: { primary: "openai/gpt-5-nano" },
               workspace: path.join(home, "clawd"),
               models: {
-                "openai/gpt-4.1-mini": {},
+                "openai/gpt-5-nano": {},
                 "anthropic/claude-opus-4-5": { alias: "Opus" },
               },
             },
@@ -2242,10 +2242,10 @@ describe("directive behavior", () => {
         {
           agents: {
             defaults: {
-              model: { primary: "openai/gpt-4.1-mini" },
+              model: { primary: "openai/gpt-5-nano" },
               workspace: path.join(home, "clawd"),
               models: {
-                "openai/gpt-4.1-mini": {},
+                "openai/gpt-5-nano": {},
                 "anthropic/claude-opus-4-5": { alias: "Opus" },
               },
             },
@@ -2278,7 +2278,7 @@ describe("directive behavior", () => {
         {
           agents: {
             defaults: {
-              model: { primary: "openai/gpt-4.1-mini" },
+              model: { primary: "openai/gpt-5-nano" },
               workspace: path.join(home, "clawd"),
             },
           },
@@ -2309,7 +2309,7 @@ describe("directive behavior", () => {
         {
           agents: {
             defaults: {
-              model: { primary: "openai/gpt-4.1-mini" },
+              model: { primary: "openai/gpt-5-nano" },
               workspace: path.join(home, "clawd"),
             },
           },
@@ -2336,7 +2336,7 @@ describe("directive behavior", () => {
 
       const res = await getReplyFromConfig(
         {
-          Body: "please sync /model openai/gpt-4.1-mini now",
+          Body: "please sync /model openai/gpt-5-nano now",
           From: "+1004",
           To: "+2000",
         },
@@ -2348,7 +2348,7 @@ describe("directive behavior", () => {
               workspace: path.join(home, "clawd"),
               models: {
                 "anthropic/claude-opus-4-5": {},
-                "openai/gpt-4.1-mini": {},
+                "openai/gpt-5-nano": {},
               },
             },
           },
diff --git a/src/auto-reply/reply.triggers.test.ts b/src/auto-reply/reply.triggers.test.ts
index 9925b27bf0..5cf6f20703 100644
--- a/src/auto-reply/reply.triggers.test.ts
+++ b/src/auto-reply/reply.triggers.test.ts
@@ -41,7 +41,7 @@ const modelCatalogMocks = vi.hoisted(() => ({
       name: "Claude Opus 4.5 (OpenRouter)",
       contextWindow: 200000,
     },
-    { provider: "openai", id: "gpt-4.1-mini", name: "GPT-4.1 mini" },
+    { provider: "openai", id: "gpt-5-nano", name: "GPT-5 Nano" },
     { provider: "openai", id: "gpt-5.2", name: "GPT-5.2" },
     { provider: "openai-codex", id: "gpt-5.2", name: "GPT-5.2 (Codex)" },
     { provider: "minimax", id: "MiniMax-M2.1", name: "MiniMax M2.1" },
@@ -320,7 +320,7 @@ describe("trigger handling", () => {
 
       const res = await getReplyFromConfig(
         {
-          Body: "/model openai/gpt-4.1-mini",
+          Body: "/model openai/gpt-5-nano",
           From: "telegram:111",
           To: "telegram:111",
           ChatType: "direct",
@@ -336,11 +336,11 @@ describe("trigger handling", () => {
       );
 
       const text = Array.isArray(res) ? res[0]?.text : res?.text;
-      expect(text).toContain("Model set to openai/gpt-4.1-mini");
+      expect(text).toContain("Model set to openai/gpt-5-nano");
 
       const store = loadSessionStore(cfg.session.store);
       expect(store[targetSessionKey]?.providerOverride).toBe("openai");
-      expect(store[targetSessionKey]?.modelOverride).toBe("gpt-4.1-mini");
+      expect(store[targetSessionKey]?.modelOverride).toBe("gpt-5-nano");
       expect(store[slashSessionKey]).toBeUndefined();
 
       vi.mocked(runEmbeddedPiAgent).mockResolvedValue({
@@ -368,7 +368,7 @@ describe("trigger handling", () => {
       expect(vi.mocked(runEmbeddedPiAgent).mock.calls[0]?.[0]).toEqual(
         expect.objectContaining({
           provider: "openai",
-          model: "gpt-4.1-mini",
+          model: "gpt-5-nano",
         }),
       );
     });
diff --git a/src/auto-reply/status.test.ts b/src/auto-reply/status.test.ts
index 9273e187fb..32cc8e4745 100644
--- a/src/auto-reply/status.test.ts
+++ b/src/auto-reply/status.test.ts
@@ -122,7 +122,7 @@ describe("buildStatusMessage", () => {
         sessionId: "override-1",
         updatedAt: 0,
         providerOverride: "openai",
-        modelOverride: "gpt-4.1-mini",
+        modelOverride: "gpt-5-nano",
         modelProvider: "anthropic",
         model: "claude-haiku-4-5",
         contextTokens: 32_000,
@@ -133,7 +133,7 @@ describe("buildStatusMessage", () => {
       modelAuth: "api-key",
     });
 
-    expect(normalizeTestText(text)).toContain("Model: openai/gpt-4.1-mini");
+    expect(normalizeTestText(text)).toContain("Model: openai/gpt-5-nano");
   });
 
   it("keeps provider prefix from configured model", () => {
diff --git a/src/auto-reply/thinking.test.ts b/src/auto-reply/thinking.test.ts
index 6bc85a93ba..74d52a3ba9 100644
--- a/src/auto-reply/thinking.test.ts
+++ b/src/auto-reply/thinking.test.ts
@@ -25,9 +25,7 @@ describe("listThinkingLevels", () => {
   });
 
   it("excludes xhigh for non-codex models", () => {
-    expect(listThinkingLevels(undefined, "gpt-4.1-mini")).not.toContain(
-      "xhigh",
-    );
+    expect(listThinkingLevels(undefined, "gpt-5-nano")).not.toContain("xhigh");
   });
 });
 
diff --git a/src/commands/agent.test.ts b/src/commands/agent.test.ts
index 3f66c78a76..75294ee793 100644
--- a/src/commands/agent.test.ts
+++ b/src/commands/agent.test.ts
@@ -152,10 +152,10 @@ describe("agentCommand", () => {
     await withTempHome(async (home) => {
       const store = path.join(home, "sessions.json");
       mockConfig(home, store, {
-        model: { primary: "openai/gpt-4.1-mini" },
+        model: { primary: "openai/gpt-5-nano" },
         models: {
           "anthropic/claude-opus-4-5": {},
-          "openai/gpt-4.1-mini": {},
+          "openai/gpt-5-nano": {},
         },
       });
 
@@ -163,7 +163,7 @@ describe("agentCommand", () => {
 
       const callArgs = vi.mocked(runEmbeddedPiAgent).mock.calls.at(-1)?.[0];
       expect(callArgs?.provider).toBe("openai");
-      expect(callArgs?.model).toBe("gpt-4.1-mini");
+      expect(callArgs?.model).toBe("gpt-5-nano");
     });
   });
 
diff --git a/src/commands/agents.test.ts b/src/commands/agents.test.ts
index 64ea85501b..aece00dcef 100644
--- a/src/commands/agents.test.ts
+++ b/src/commands/agents.test.ts
@@ -27,7 +27,7 @@ describe("agents helpers", () => {
             name: "Work",
             workspace: "/work-ws",
             agentDir: "/state/agents/work/agent",
-            model: "openai/gpt-4.1",
+            model: "openai/gpt-5-nano",
           },
         ],
       },
diff --git a/src/commands/models.list.test.ts b/src/commands/models.list.test.ts
index 3a5b34ef05..76c0b0847c 100644
--- a/src/commands/models.list.test.ts
+++ b/src/commands/models.list.test.ts
@@ -157,8 +157,8 @@ describe("models list/status", () => {
       },
       {
         provider: "openai",
-        id: "gpt-4.1-mini",
-        name: "GPT-4.1 mini",
+        id: "gpt-5-nano",
+        name: "GPT-5 Nano",
         input: ["text"],
         baseUrl: "https://api.openai.com/v1",
         contextWindow: 128000,
@@ -199,8 +199,8 @@ describe("models list/status", () => {
       },
       {
         provider: "openai",
-        id: "gpt-4.1-mini",
-        name: "GPT-4.1 mini",
+        id: "gpt-5-nano",
+        name: "GPT-5 Nano",
         input: ["text"],
         baseUrl: "https://api.openai.com/v1",
         contextWindow: 128000,
@@ -241,8 +241,8 @@ describe("models list/status", () => {
       },
       {
         provider: "openai",
-        id: "gpt-4.1-mini",
-        name: "GPT-4.1 mini",
+        id: "gpt-5-nano",
+        name: "GPT-5 Nano",
         input: ["text"],
         baseUrl: "https://api.openai.com/v1",
         contextWindow: 128000,
diff --git a/src/config/config.test.ts b/src/config/config.test.ts
index a42e08cf44..2b0447cac0 100644
--- a/src/config/config.test.ts
+++ b/src/config/config.test.ts
@@ -1603,10 +1603,10 @@ describe("legacy config detection", () => {
     const res = migrateLegacyConfig({
       agent: {
         model: "anthropic/claude-opus-4-5",
-        modelFallbacks: ["openai/gpt-4.1-mini"],
-        imageModel: "openai/gpt-4.1-mini",
+        modelFallbacks: ["openai/gpt-5-nano"],
+        imageModel: "openai/gpt-5-nano",
         imageModelFallbacks: ["anthropic/claude-opus-4-5"],
-        allowedModels: ["anthropic/claude-opus-4-5", "openai/gpt-4.1-mini"],
+        allowedModels: ["anthropic/claude-opus-4-5", "openai/gpt-5-nano"],
         modelAliases: { Opus: "anthropic/claude-opus-4-5" },
       },
     });
@@ -1615,10 +1615,10 @@ describe("legacy config detection", () => {
       "anthropic/claude-opus-4-5",
     );
     expect(res.config?.agents?.defaults?.model?.fallbacks).toEqual([
-      "openai/gpt-4.1-mini",
+      "openai/gpt-5-nano",
     ]);
     expect(res.config?.agents?.defaults?.imageModel?.primary).toBe(
-      "openai/gpt-4.1-mini",
+      "openai/gpt-5-nano",
     );
     expect(res.config?.agents?.defaults?.imageModel?.fallbacks).toEqual([
       "anthropic/claude-opus-4-5",
@@ -1627,7 +1627,7 @@ describe("legacy config detection", () => {
       res.config?.agents?.defaults?.models?.["anthropic/claude-opus-4-5"],
     ).toMatchObject({ alias: "Opus" });
     expect(
-      res.config?.agents?.defaults?.models?.["openai/gpt-4.1-mini"],
+      res.config?.agents?.defaults?.models?.["openai/gpt-5-nano"],
     ).toBeTruthy();
     expect(res.config?.agent).toBeUndefined();
   });
diff --git a/src/cron/isolated-agent.test.ts b/src/cron/isolated-agent.test.ts
index 713bfd4d71..1c579bc48e 100644
--- a/src/cron/isolated-agent.test.ts
+++ b/src/cron/isolated-agent.test.ts
@@ -213,7 +213,7 @@ describe("runCronIsolatedAgentTurn", () => {
         job: makeJob({
           kind: "agentTurn",
           message: "do it",
-          model: "openai/gpt-4.1-mini",
+          model: "openai/gpt-5-nano",
         }),
         message: "do it",
         sessionKey: "cron:job-1",
@@ -226,7 +226,7 @@ describe("runCronIsolatedAgentTurn", () => {
         model?: string;
       };
       expect(call?.provider).toBe("openai");
-      expect(call?.model).toBe("gpt-4.1-mini");
+      expect(call?.model).toBe("gpt-5-nano");
     });
   });
 
diff --git a/src/gateway/hooks-mapping.test.ts b/src/gateway/hooks-mapping.test.ts
index 2a013e0fb1..d1b497ad2e 100644
--- a/src/gateway/hooks-mapping.test.ts
+++ b/src/gateway/hooks-mapping.test.ts
@@ -46,7 +46,7 @@ describe("hooks mapping", () => {
           match: { path: "gmail" },
           action: "agent",
           messageTemplate: "Subject: {{messages[0].subject}}",
-          model: "openai/gpt-4.1-mini",
+          model: "openai/gpt-5-nano",
         },
       ],
     });
@@ -58,7 +58,7 @@ describe("hooks mapping", () => {
     });
     expect(result?.ok).toBe(true);
     if (result?.ok && result.action.kind === "agent") {
-      expect(result.action.model).toBe("openai/gpt-4.1-mini");
+      expect(result.action.model).toBe("openai/gpt-5-nano");
     }
   });
 
diff --git a/src/gateway/server.hooks.test.ts b/src/gateway/server.hooks.test.ts
index 07b863062f..1ec642baaa 100644
--- a/src/gateway/server.hooks.test.ts
+++ b/src/gateway/server.hooks.test.ts
@@ -88,7 +88,7 @@ describe("gateway server hooks", () => {
       body: JSON.stringify({
         message: "Do it",
         name: "Email",
-        model: "openai/gpt-4.1-mini",
+        model: "openai/gpt-5-nano",
       }),
     });
     expect(res.status).toBe(202);
@@ -96,7 +96,7 @@ describe("gateway server hooks", () => {
     const call = cronIsolatedRun.mock.calls[0]?.[0] as {
       job?: { payload?: { model?: string } };
     };
-    expect(call?.job?.payload?.model).toBe("openai/gpt-4.1-mini");
+    expect(call?.job?.payload?.model).toBe("openai/gpt-5-nano");
     drainSystemEvents(resolveMainKey());
     await server.close();
   });