[BUG] claude with model sonnet[1m] doesn't accept single messages > 200.000 tokens

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?

When I try to send a message to claude with model sonnet[1m] in batch mode, I get an api error 400 with the error message, that this execeeds context limit (see below).

What Should Happen?

claude should accept and process the message

Error Messages/Logs

$ cat mylongprompt.md | claude --model=sonnet[1m] -p
API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"input length and `max_tokens` exceed context limit: 199139 + 21333 > 200000, decrease input length or `max_tokens` and try again"},"request_id":"req_xxx"}

Steps to Reproduce

take a long text file and pipe it to "claude --model=sonnet[1m] -p

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

1.0.112

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Non-interactive/CI environment

Additional Information

_No response_