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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.0.77 6 Jan 2026

Claude Sonnet 4 with 1M Context Beta Support

What

The max tokens calculation now correctly handles Claude Sonnet 4 models using the 1M context beta.

Details

Previously only models with [1m] in the name got 1M max tokens
Now also applies when context-1m-2025-08-07 beta header is used with claude-sonnet-4 models
Enables proper token limits for Sonnet 4 + 1M context combinations

Evidence

R$() at line 1818 (max tokens calculation, contains "claude-sonnet-4" and T8A)

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.0.77 →