Sonnet 5.5 keeps $2/$10 per million tokens; thinking always on, `between_tools` disables it
ClaudeDevs · x · 2026-09-29
Claude Sonnet 5.5 is priced the same as Sonnet 5: $2/$10 per million tokens with cache reads at $0.20.
Migration guide highlights: thinking now runs by default (adaptive mode), and you can use betweentools to turn off upfront thinking. Five legacy settings return 400 errors: thinking budgets, sampling parameters, assistant prefill, forced tool choice, and thinking: {"type": "disabled"}. Anthropic provides per-model migration checklists from Sonnet 5/4.6/4.5/4/3.7 and Haiku 4.5.
Related event: Anthropic Launches Claude Sonnet 5.5: Over 30% Faster, Up to 30% Cheaper(58 posts)→
More from coding & agent
- AI prototype unreliable? Scope it down: let the agent do less, then grow — brandon_galang · 2026-11-13
- Porting an Unreal game to iPhone and iPad with Claude Code, no manual Xcode work — chongdashu · 2026-11-13
- Influzer launches an instant MCP server inspector: paste any URL to see its tools — Fine_Airline_6832 · 2026-11-13
- Open-source getmcp-cli turns 1,280-endpoint OpenAPI specs into 25-tool MCP servers, cutting tool tokens from 263k to 6k — Worried-Barracuda845 · 2026-11-13
- Who's paying for unused AI coding seats? Per-seat billing is quietly leaking money — rcleffke · 2026-11-13
- Formal verification is the Rust of software correctness — LLMs are making people write specs — arpit_bhayani · 2026-11-13