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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 v2.1.227

Bedrock and Vertex share one stale-model check

Under the hood
Useful2 Signal1
Elsewhere

Bedrock and Vertex now share one check for outdated pinned model variables.

What

The duplicated per-provider code that checks whether your pinned model environment variables lag the current defaults is now a single shared routine.

Details
  • Covers ANTHROPIC_DEFAULT_SONNET_MODEL, ANTHROPIC_DEFAULT_OPUS_MODEL, and ANTHROPIC_SMALL_FAST_MODEL / ANTHROPIC_DEFAULT_HAIKU_MODEL.
  • The Bedrock path now emits tengu_bedrock_upgrade_check before resolving model IDs instead of after.
Evidence

tengu_bedrock_upgrade_check

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 v2.1.227 →