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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 v2.1.195

Model Catalog: New and Updated Models

What

The model catalog has been reworked into a structured, versioned manifest (schema_version: 1) covering all current models. Several new models are now registered.

Details
  • New model entries added: claude-sonnet-4-6 (Sonnet 4.6, knowledge cutoff August 2025), claude-opus-4-6 (Opus 4.6, knowledge cutoff May 2025 with fast_mode), claude-opus-4-7 (Opus 4.7, native 1M context, xhigh_effort, knowledge cutoff January 2026, default effort xhigh), claude-opus-4-8 (Opus 4.8, native 1M context, lean_prompt, mid_conv_system, default effort high), claude-fable-5 (Fable 5, native 1M context, rejects_disabled_thinking, fable_5_mitigations).
  • Family aliases updated: opus → claude-opus-4-8, sonnet → claude-sonnet-4-6, fable → claude-fable-5.
  • All models include provider IDs for first_party, bedrock, vertex, foundry, anthropic_aws, mantle, and gateway.
  • Capability flags now include effort, max_effort, xhigh_effort, adaptive_thinking, context_management, fast_mode, lean_prompt, and mid_conv_system.
Evidence

New model catalog object with schema_version: 1 (search for "Generated by \bun run generate:model-catalog\", "claude-sonnet-4-6", "claude-fable-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 v2.1.195 →