feat(providers): add Claude Opus 5.5

[waleedlatif1]

Summary

• Add claude-opus-5-5 to the Anthropic catalog: $4 / $20 per MTok, $0.20 cache read, 1M context, 128K max output, 512-token cache minimum, released 2026-09-22
• Adaptive thinking is always on with a medium default effort; forced tool_choice is rejected by the API, so the entry sets forcedToolUse: false and the adapter falls back to auto with a warning (same path as Fable 5.1)
• Mark Opus 5.5 as the recommended Opus and move Opus 5 to legacy, matching the Anthropic models overview
• Regenerate the Agent block streamed-thinking docs table

Type of Change

• New feature

Testing

• Every value verified against the live Anthropic model page, models overview, pricing page, and what's-new page; input/output/context/release date cross-checked on Artificial Analysis
• providers/models.test.ts, anthropic/core.thinking.test.ts, anthropic/core.request.test.ts, providers/utils.test.ts, providers/index.test.ts: 392 passing
• bun run lint, bun run type-check, check:audits (47 audits), agent-stream-docs:check, docs-manifest:check all pass

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

[vercel]

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Project	Deployment	Actions	Updated
docs	Ready	Preview	Sep 22, 2026 5:31pm UTC

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with no concrete correctness, security, or repository-rule violations identified.

Summary

Adds Claude Opus 5.5 to the Anthropic model catalog and integrates its capabilities with existing request behavior.

• Defines pricing, token limits, caching, structured-output, adaptive-thinking, and tool-choice metadata.
• Marks Opus 5.5 as recommended and moves Opus 5 to legacy status.
• Extends request and capability tests for adaptive thinking and forced-tool fallback.
• Regenerates the Agent block streamed-thinking documentation.

_{Reviews (1) · Last reviewed commit: "feat(providers): add Claude Opus 5.5"}

[cubic-dev-ai]

No issues found across 6 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}