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Claude Opus 5.5

github.com273 points2 comments
Screenshot of Claude Opus 5.5

Code changes add first-class support for Claude Opus 5.5 to a Swift client and its documentation, examples, and tests. README snippets and usage examples are updated to reference the new model identifier (.opus5_5 / "claude-opus-5-5") in places that show model construction, fixed effort levels, fallbacks, and user-profile wiring. Explanatory text about model identifiers and dateless/pinned snapshots is adjusted to mention the new 5.5 identifier. Examples that pin effort (e.g., .xhigh), specify fallback chains, and attach user profile IDs now show .opus5_5, and guidance about which effort and reasoning hints map to API effort levels is preserved.

A new ClaudeModel constant opus5_5 is defined with its ID and explicit capabilities: supported effortLevels (low, medium, high, xhigh, max), adaptiveThinking, structuredOutput, and imageInput. Minor policy/tooling notes are updated to say Opus 5.5 (and related models) reject forced tool use. Tests for the request builder are extended to include .opus5_5 in the set of models exercised, ensuring request construction and adaptive thinking behavior are validated for the new model. Overall, the changes integrate Opus 5.5 into the client surface so developers can select and program against that pinned model.

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