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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 v2.1.247

One helper now answers what effort levels a model supports

Under the hood
Useful2 Signal3
Models

One lookup now decides which effort levels a model supports, defaulting unknown models to low, medium and high.

What

Scattered per-capability checks were replaced by a single lookup reporting whether a model supports effort settings at all and which of the higher tiers it allows, plus the default. Unknown models fall back to low, medium and high with effort unsupported.

Evidence

supportsUltra

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 →