Source Intelligence

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 v2.1.248

Per-surface context limits for claude-sonnet-5

Under the hood
Useful3 Signal4
Models Notable

Context limits for claude-sonnet-5 are 500,000 on two surfaces and a million elsewhere.

What

A limits table keyed by surface gives claude-sonnet-5 a 500,000 context default on the remote-cowork and local-agent surfaces and 1,000,000 everywhere else. Nothing visible gates the table itself.

Details
  • A separate group covering claude-sonnet-4-6, claude-opus-4-6, claude-opus-4-8 and claude-opus-5 is used for a capability check whose consumers are not settled by this code.
Evidence

remote_cowork

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 v2.1.248 →