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chore: stop using retired claude-sonnet-4-5 - #138

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sanchitrk merged 3 commits into
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claude/intelligent-proskuriakova-37265a
Nov 6, 2026
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sanchitrk merged 3 commits into
canaryfrom
claude/intelligent-proskuriakova-37265a

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@sanchitrk sanchitrk commented Nov 4, 2026 •

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Anthropic retires Claude Sonnet 4.5 (claude-sonnet-4-5) from the Claude API on 2026-11-30, 9AM PT, and it has been degraded since 2026-10-30. This stops us offering or testing against it.

  • Catalog: modelgen skips anthropic/claude-sonnet-4-5 and anthropic/claude-sonnet-4-5-20250929, through the existing models.dev skip list. In baseline.json, only the regenerated anthropic section is taken, which removes exactly those two entries; the live OpenRouter listing's unrelated churn is left out. The modelgen test output is regenerated.
  • Tests: the harness thread test and the codework CLI/ACP tests use Claude Sonnet 5.5 (claude-sonnet-5-5, openrouter/anthropic/claude-sonnet-5.5), with their saved output regenerated. The aikit budget-thinking wire fixtures use claude-haiku-4-5, because the fixture needs a model that doesn't use adaptive thinking, and Sonnet 5.5 does.

Left as is:

  • Other providers that still serve Sonnet 4.5 (OpenRouter, Vertex, Azure, gateways). The announcement covers the Claude API only.
  • The Sonnet 4.5 200k context-window rule in modelgen, which still applies to those providers.
  • packages/tui (paused) and CHANGELOG.md.

Checks: vp check, vp run typecheck, the aikit suite, and the harness thread and codework acp/cli tests pass. Live tests were skipped (no credentials).

🤖 Generated with Claude Code

Anthropic retires Claude Sonnet 4.5 from the Claude API on 2026-11-30.
Tests that picked it now use Claude Sonnet 5.5; the budget-thinking wire
fixtures use Claude Haiku 4.5, which still takes budget_tokens.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@sanchitrk
sanchitrk changed the base branch from main to canary November 4, 2026 18:41
sanchitrk and others added 2 commits November 5, 2026 00:16
modelgen now skips anthropic/claude-sonnet-4-5 and its dated id, which
Anthropic retires from the Claude API on 2026-11-30. The baseline takes
only the regenerated anthropic section; OpenRouter's listing is unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
@sanchitrk
sanchitrk merged commit 422ed1d into canary Nov 6, 2026
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@sanchitrk
sanchitrk deleted the claude/intelligent-proskuriakova-37265a branch November 6, 2026 07:50
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