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Posts tagged "Claude Opus 5.5"
3 posts
Claude Opus 5.5 API Guide: Model ID, Endpoints, First Call
Claude Opus 5.5 on Router One: the claude-opus-5-5 id, 1M context, always-on thinking, plan coverage, and first calls on /v1/messages and Chat Completions.
Router One Team
Claude Code on Opus 5.5: Default Model, Plans and 1M Context
Claude Code 2.1.280 defaults to Opus 5.5, which no Router One plan covers as of 2026-09-24. Pin Opus 5 for plan quota and move background tasks to Haiku 4.5.
Router One Team
Migrating to Claude Opus 5.5: Breaking Changes and 400 Fixes
Move Opus 5 code to claude-opus-5-5: four breaking changes, the exact 400 errors, before/after JSON, what Router One normalizes, and which SDKs are ready.
Router One Team