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Copilot upstream returns model_not_supported when the client sends dash-form Claude IDs (claude-sonnet-4-6, claude-sonnet-4-6[1m]) while /models only accepts dot form (claude-sonnet-4.6, -1m suffix). - Add copilot_model_map: syntax normalize (dash->dot, [1m]->-1m) plus live /models exact match and family-version fallback, reusing the existing 5 min auth cache. Returns None when the whole family is absent so upstream surfaces an explicit error instead of silently switching families. - Wire into forwarder Copilot hook; runs before anthropic_to_openai conversion. - Default Opus slot in the Copilot preset maps to Sonnet 4.6: Pro dropped all Opus on 2026-04-20 and Pro+ bills Opus 4.7 at 7.5x. Users who want real Opus can switch manually in the UI. Refs: https://github.com/farion1231/cc-switch/issues/2016