From d65547dcaa3e79764d30668ff11065287693889c Mon Sep 17 00:00:00 2001
From: municorn <municorn@musicaloft.com>
Date: Mon, 20 Oct 2025 15:09:59 -0600
Subject: [PATCH] fix(anthropic): remove `top_p` parameter for Claude 4.5
 models

Fixes #520.
---
 src/engine/anthropic.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/engine/anthropic.ts b/src/engine/anthropic.ts
index 7dbc593..880e400 100644
--- a/src/engine/anthropic.ts
+++ b/src/engine/anthropic.ts
@@ -37,9 +37,14 @@ export class AnthropicEngine implements AiEngine {
       system: systemMessage,
       messages: restMessages,
       temperature: 0,
-      top_p: 0.1,
       max_tokens: this.config.maxTokensOutput
     };
+
+    // add top_p for non-4.5 models
+    if (!params.model.includes('-4-5')) {
+      params.top_p = 0.1;
+    }
+
     try {
       const REQUEST_TOKENS = messages
         .map((msg) => tokenCount(msg.content as string) + 4)