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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.

← All of v2.1.247 Home All releases ←olderv2.1.246 v2.1.248newer→
Claude Code v2.1.247

Sonnet 5 default context window raised to 1,000,000 tokens

You'll notice
Useful5 Signal3
Models Notable

Sonnet 5's default context window is now a full million tokens, up from 967,000.

claude-sonnet-5
What

The built-in context size for claude-sonnet-5 went from 967,000 to 1,000,000 tokens. The smaller 500,000 limits used for remote cowork and local agent runs are unchanged.

Evidence

"claude-sonnet-5"

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.247 →