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* fix(models): keep the OAuth betas when a Claude request sends its own betas ClaudeChatModel put the Claude Code OAuth betas (oauth-2025-04-20, ...) only in the client's default anthropic-beta header. A request whose payload carries betas is sent through beta.messages.create, and the Anthropic SDK turns that list into a per-request anthropic-beta header that replaces the default. So a configured betas list (even []), per-call betas, or a server tool for which langchain-anthropic appends a beta sent the request without oauth-2025-04-20, and Anthropic rejects the Bearer token. _get_request_payload now puts the OAuth betas first in any request betas list before the thinking budget resolves the header. Requests without betas keep the default header, and API-key models are unchanged. The list is rebuilt because the payload's betas can be self.betas. Fixes #8060 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * docs(changelog): link the Claude OAuth betas fix to #8061 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * fix(models): keep the OAuth betas in a caller's anthropic-beta extra header The Anthropic SDK lets a request's extra_headers override both the client default and the header built from betas. An anthropic-beta in extra_headers, from model_kwargs or passed per call, therefore still dropped the OAuth betas and Anthropic rejected the Bearer token. _apply_oauth_betas now gives that header the same merge as betas: the OAuth betas go first and the caller's betas follow without repeats. The headers dict is copied because it can be the one in model_kwargs. API-key models are unchanged. Refs #8060 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: AochenShen99 <sac1063467113@hotmail.com>