[BUG] API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"max_tokens: 128001 > 64000, which is the maximum allowed number of output tokens for claude-opus-4-5-20251101"},"request_id":"req_011CXxg3eqF8ZMvqtkKHNjKQ"}

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"max_tokens: 128001 > 64000, which is the maximum allowed number of
output tokens for claude-opus-4-5-20251101"},"request_id":"req_011CXxg3eqF8ZMvqtkKHNjKQ"}

What Should Happen?

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"max_tokens: 128001 > 64000, which is the maximum allowed number of
output tokens for claude-opus-4-5-20251101"},"request_id":"req_011CXxg3eqF8ZMvqtkKHNjKQ"}

Error Messages/Logs

Steps to Reproduce

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"max_tokens: 128001 > 64000, which is the maximum allowed number of
output tokens for claude-opus-4-5-20251101"},"request_id":"req_011CXxg3eqF8ZMvqtkKHNjKQ"}

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

latest

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_