Fix Anthropic/Gemini providers; add latest curated models - #2
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- Anthropic: send valid `anthropic-version: 2023-06-01` header (was a branding string that Anthropic rejects with HTTP 400); move branding to User-Agent. - Gemini: send tool results (functionResponse parts) in a `user` turn instead of `model`; Gemini only accepts user/model roles. - Add regression tests for both fixes. - Curated models: add OpenAI GPT-5.6, Gemini 3.6 Flash and 3.5 Flash-Lite, Anthropic Opus 4.7/4.6; default Gemini preset -> 3.6 Flash. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Summary
Two provider bug fixes plus refreshed curated model lists. Builds clean; 35/35 tests pass (33 existing + 2 new regression tests).
Fixed
anthropic-versionheader — was sending the branding stringLLMProviderKit/1.0, which the Anthropic API rejects with HTTP 400 (invalid anthropic-version). Now sends the required dated value2023-06-01; branding moved toUser-Agent. This unblocks the Anthropic provider against the live API.functionResponseparts were sent in amodelturn. Gemini only acceptsuser/modelroles and expects function responses in auserturn (docs); sending them asmodelis rejected/mishandled. Now usesuser.Added (latest models, July 2026)
gpt-5.6, alias → Sol) as flagship.gemini-3.6-flash, new flagship) and 3.5 Flash-Lite (gemini-3.5-flash-lite); default Gemini preset bumped to 3.6 Flash; reasoning heuristic extended togemini-3.6-.claude-opus-4-7) and Opus 4.6 (claude-opus-4-6).Tests
anthropicSendsValidVersionHeader,geminiSendsToolResultsAsUserRole.🤖 Generated with Claude Code