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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 v2.1.197

Claude Sonnet 5 Is Now the Default Model

What

Claude Sonnet 5 (claude-sonnet-5) becomes the default Sonnet tier model, replacing Claude Sonnet 4.6. The sonnet alias now resolves to claude-sonnet-5.

Details
  • Model ID: claude-sonnet-5
  • 1M context window, 64K default output tokens, 128K max output tokens
  • Full adaptive thinking support (max effort level enabled)
  • Available on all providers: first-party Anthropic API, Bedrock (us.anthropic.claude-sonnet-5), Vertex (claude-sonnet-5), Foundry, Gateway, and Mantle (anthropic.claude-sonnet-5)
  • Sonnet 4.6 is retained in the model picker as "Sonnet 4.6 ยท Previous Sonnet version"
  • Hook examples in settings/CLAUDE.md now reference claude-sonnet-5
Evidence

SONNET_ID constant updated (search for "claude-sonnet-5" in model constants; SONNET_NAME: "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 v2.1.197 →