From b81b4195b8ebd0d8c26d8e85cdc31152f6ebe9b7 Mon Sep 17 00:00:00 2001
From: Edmund Walsh <ewalsh@economicdatasciences.com>
Date: Mon, 30 Mar 2026 09:51:40 +0000
Subject: [PATCH] fix: remove unsupported anthropic_beta flag from Bedrock
 Converse API

The Bedrock provider was unconditionally sending
`anthropic_beta: ["fine-grained-tool-streaming-2025-05-14"]` in
additionalModelRequestFields for all Claude models. The Bedrock
Converse API does not support Anthropic beta flags, causing all
Claude requests to fail with "invalid beta flag".

Fixes #8297
---
 core/llm/llms/Bedrock.ts | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/core/llm/llms/Bedrock.ts b/core/llm/llms/Bedrock.ts
index bc9566cbecc..62c74bfb3d0 100644
--- a/core/llm/llms/Bedrock.ts
+++ b/core/llm/llms/Bedrock.ts
@@ -348,9 +348,6 @@ class Bedrock extends BaseLLM {
               budget_tokens: options.reasoningBudgetTokens,
             }
           : undefined,
-        anthropic_beta: options.model.includes("claude")
-          ? ["fine-grained-tool-streaming-2025-05-14"]
-          : undefined,
       },
     };
   }