diff --git a/src/agents/pi-embedded-subscribe.ts b/src/agents/pi-embedded-subscribe.ts
index 1c92d65e89..a48a2de71c 100644
--- a/src/agents/pi-embedded-subscribe.ts
+++ b/src/agents/pi-embedded-subscribe.ts
@@ -32,10 +32,10 @@ import {
   promoteThinkingTagsToBlocks,
 } from "./pi-embedded-utils.js";
 
-const THINKING_TAG_RE = /<\s*\/?\s*think(?:ing)?\s*>/gi;
-const THINKING_OPEN_RE = /<\s*think(?:ing)?\s*>/i;
-const THINKING_CLOSE_RE = /<\s*\/\s*think(?:ing)?\s*>/i;
-const THINKING_TAG_SCAN_RE = /<\s*(\/?)\s*think(?:ing)?\s*>/gi;
+const THINKING_TAG_RE = /<\s*\/?\s*(?:think(?:ing)?|thought|antthinking)\s*>/gi;
+const THINKING_OPEN_RE = /<\s*(?:think(?:ing)?|thought|antthinking)\s*>/i;
+const THINKING_CLOSE_RE = /<\s*\/\s*(?:think(?:ing)?|thought|antthinking)\s*>/i;
+const THINKING_TAG_SCAN_RE = /<\s*(\/?)\s*(?:think(?:ing)?|thought|antthinking)\s*>/gi;
 const TOOL_RESULT_MAX_CHARS = 8000;
 const log = createSubsystemLogger("agent/embedded");
 const RAW_STREAM_ENABLED = process.env.CLAWDBOT_RAW_STREAM === "1";
diff --git a/src/agents/pi-embedded-utils.ts b/src/agents/pi-embedded-utils.ts
index 370be2d4e8..f52ccbe40c 100644
--- a/src/agents/pi-embedded-utils.ts
+++ b/src/agents/pi-embedded-utils.ts
@@ -52,12 +52,12 @@ export function splitThinkingTaggedText(
   // with a think tag (common for local/OpenAI-compat providers that emulate
   // reasoning blocks via tags).
   if (!trimmedStart.startsWith("<")) return null;
-  const openRe = /<\s*think(?:ing)?\s*>/i;
-  const closeRe = /<\s*\/\s*think(?:ing)?\s*>/i;
+  const openRe = /<\s*(?:think(?:ing)?|thought|antthinking)\s*>/i;
+  const closeRe = /<\s*\/\s*(?:think(?:ing)?|thought|antthinking)\s*>/i;
   if (!openRe.test(trimmedStart)) return null;
   if (!closeRe.test(text)) return null;
 
-  const scanRe = /<\s*(\/?)\s*think(?:ing)?\s*>/gi;
+  const scanRe = /<\s*(\/?)\s*(?:think(?:ing)?|thought|antthinking)\s*>/gi;
   let inThinking = false;
   let cursor = 0;
   let thinkingStart = 0;
@@ -136,7 +136,7 @@ export function promoteThinkingTagsToBlocks(message: AssistantMessage): void {
 
 export function extractThinkingFromTaggedText(text: string): string {
   if (!text) return "";
-  const scanRe = /<\s*(\/?)\s*think(?:ing)?\s*>/gi;
+  const scanRe = /<\s*(\/?)\s*(?:think(?:ing)?|thought|antthinking)\s*>/gi;
   let result = "";
   let lastIndex = 0;
   let inThinking = false;
@@ -157,8 +157,8 @@ export function extractThinkingFromTaggedStream(text: string): string {
   const closed = extractThinkingFromTaggedText(text);
   if (closed) return closed;
 
-  const openRe = /<\s*think(?:ing)?\s*>/gi;
-  const closeRe = /<\s*\/\s*think(?:ing)?\s*>/gi;
+  const openRe = /<\s*(?:think(?:ing)?|thought|antthinking)\s*>/gi;
+  const closeRe = /<\s*\/\s*(?:think(?:ing)?|thought|antthinking)\s*>/gi;
   const openMatches = [...text.matchAll(openRe)];
   if (openMatches.length === 0) return "";
   const closeMatches = [...text.matchAll(closeRe)];