{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/claude-sonnet-5-5/","md":"https://postcutoff.com/m/claude-sonnet-5-5/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"claude-sonnet-5-5","name":"Claude Sonnet 5.5","org":"Anthropic","family":"Claude 5","released":"2026-09-28","status":"current","type":"reasoning-llm","modality_in":["text","image","pdf"],"modality_out":["text"],"open_weights":false,"model_license":"proprietary","context_window":1000000,"max_output":128000,"knowledge_cutoff":"2026-06","pricing":{"input":2,"output":10,"cache_read":0.1,"unit":"per 1M tokens (USD); Batch API 50% off","source":"https://platform.claude.com/docs/en/about-claude/pricing"},"price_line":"$2 in, $10 out per 1M tokens","access":[{"provider":"Anthropic API (Claude API)","model_id":"claude-sonnet-5-5","endpoint":"https://api.anthropic.com/v1/messages","docs":"https://platform.claude.com/docs/en/models/sonnet-5-5/overview"},{"provider":"AWS Bedrock (Messages API / Mantle)","model_id":"anthropic.claude-sonnet-5-5","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock"},{"provider":"Google Cloud Vertex AI","model_id":"claude-sonnet-5-5","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai"},{"provider":"Microsoft Foundry (Azure)","model_id":"claude-sonnet-5-5","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry"},{"provider":"Claude Platform on AWS","model_id":"claude-sonnet-5-5","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws"},{"provider":"OpenRouter","model_id":"anthropic/claude-sonnet-5.5","url":"https://openrouter.ai/anthropic/claude-sonnet-5.5"},{"provider":"Web app","url":"https://claude.ai"}],"capabilities":[{"name":"Opus-level knowledge work at Sonnet price","detail":"Scores nearly level with Opus 5.5 on GDPval-AA (1844 vs 1846 Elo), at $2/$10 per MTok.","first":false,"discovered":"launch","source":"https://www.anthropic.com/claude-sonnet-5-5"},{"name":"Large agentic-coding jump","detail":"Anthropic reports 70.6% on Terminal-Bench 4.0, up from 10.3% for Sonnet 5, and up to 30% lower cost per task.","first":false,"discovered":"launch","source":"https://www.anthropic.com/claude-sonnet-5-5"},{"name":"Beat Pokemon Red from screenshots","detail":"Anthropic says it is the first Sonnet model to finish Pokemon Red using only screenshots.","first":true,"discovered":"launch","source":"https://www.anthropic.com/claude-sonnet-5-5"},{"name":"between_tools thinking mode","detail":"New thinking type that turns off up-front thinking while still reasoning between tool calls; it replaces thinking: disabled.","first":true,"discovered":"launch","source":"https://platform.claude.com/docs/en/models/sonnet-5-5/overview"},{"name":"Token efficiency","detail":"A Balyasny test used 121k tokens per task, versus 497k for Sonnet 5.","first":false,"discovered":"launch","source":"https://www.anthropic.com/claude-sonnet-5-5"}],"entry":null,"notes":"Best speed/intelligence balance. Adaptive thinking on by default (effort default high); thinking {type: disabled} returns 400, use {type: between_tools} at effort high or below; forced tool_choice any/tool returns 400; non-default temperature/top_p/top_k return 400. Batch $1/$5. Cache-read price cut from $0.20 to $0.10 per MTok on Oct 7, 2026 (5% of base input).","verified":"2026-10-08","body_md":"Everyday coding, agents and enterprise workloads at Sonnet pricing; successor to Claude Sonnet 5 at the same price.\n\n```bash\ncurl https://api.anthropic.com/v1/messages \\\n -H \"x-api-key: $ANTHROPIC_API_KEY\" -H \"anthropic-version: 2023-06-01\" -H \"content-type: application/json\" \\\n -d '{\"model\":\"claude-sonnet-5-5\",\"max_tokens\":16000,\"messages\":[{\"role\":\"user\",\"content\":\"Hello\"}]}'\n```\n\nSources:\n- Model page: https://platform.claude.com/docs/en/models/sonnet-5-5/overview\n- Announcement: https://www.anthropic.com/claude-sonnet-5-5\n- Pricing: https://platform.claude.com/docs/en/about-claude/pricing\n- Models overview: https://platform.claude.com/docs/en/about-claude/models/overview\n- Deprecations: https://platform.claude.com/docs/en/about-claude/model-deprecations","page_url":"https://postcutoff.com/m/claude-sonnet-5-5/","events_after":1795,"major_after":409,"historic_after":81,"missing_at_launch":470,"events_since_release":null,"you_url":"https://postcutoff.com/you/claude-sonnet-5-5/","briefings":{"xs":"https://postcutoff.com/briefings/cutoff-2026-06-xs.md","s":"https://postcutoff.com/briefings/cutoff-2026-06-s.md","m":"https://postcutoff.com/briefings/cutoff-2026-06-m.md","full":"https://postcutoff.com/briefings/cutoff-2026-06.md"}}