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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

Sonnet 5 Added to the 1M Context Picker

What

A "Sonnet 5 (1M context)" option now appears in the extended-context model picker, and the previous "Sonnet (1M context)" entry is renamed to "Sonnet 4.6 (1M context)".

Details
  • New entry: value: "sonnet[1m]" → "Sonnet 5 (1M context)" — "Sonnet 5 with 1M context window - for long sessions with large codebases"
  • Renamed entry: value: "claude-sonnet-4-6[1m]" → "Sonnet 4.6 (1M context)"
  • Sonnet 5 has native_1m support on all 3rd-party providers (Bedrock, Vertex, Foundry, Gateway); availability is checked per-provider against a new native_1m_3p capability flag
  • The "not available for your account" error message updated from "Sonnet 4.6 with 1M context is not available…" to "Sonnet with 1M context is not available…"
Evidence

New picker option (search for "Sonnet 5 (1M context)"); renamed entry (search for "Sonnet 4.6 (1M context)"); availability check function (search for "native_1m_3p")

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 →