{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/claude-opus-4-6/","md":"https://postcutoff.com/m/claude-opus-4-6/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-opus-4-6","name":"Claude Opus 4.6","org":"Anthropic","family":"Claude 4","released":"2026-02-05","status":"legacy","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":"2025-05","pricing":{"input":5,"output":25,"cache_read":0.5,"unit":"per 1M tokens (USD); Batch API 50% off","source":"https://platform.claude.com/docs/en/about-claude/pricing"},"price_line":"$5 in, $25 out per 1M tokens","access":[{"provider":"Anthropic API (Claude API)","model_id":"claude-opus-4-6","endpoint":"https://api.anthropic.com/v1/messages","docs":"https://platform.claude.com/docs/en/models/opus-4-6/overview"},{"provider":"AWS Bedrock (InvokeModel)","model_id":"anthropic.claude-opus-4-6-v1","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-on-amazon-bedrock-legacy"},{"provider":"Google Cloud Vertex AI","model_id":"claude-opus-4-6","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai"},{"provider":"Microsoft Foundry (Azure)","model_id":"claude-opus-4-6","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry"},{"provider":"Claude Platform on AWS","model_id":"claude-opus-4-6","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws"},{"provider":"OpenRouter","model_id":"anthropic/claude-opus-4.6","url":"https://openrouter.ai/anthropic/claude-opus-4.6"},{"provider":"Web app","url":"https://claude.ai"}],"capabilities":[{"name":"1M-token context for Opus","detail":"First Opus with a 1M-token context window (launched in beta). Scored 76% on MRCR v2 long-context retrieval versus 18.5% for Sonnet 4.5.","first":true,"discovered":"launch","source":"https://www.anthropic.com/news/claude-opus-4-6"},{"name":"Adaptive thinking","detail":"Introduced adaptive thinking: the model decides when and how much to think, steered by effort.","first":true,"discovered":"launch","source":"https://www.anthropic.com/news/claude-opus-4-6"},{"name":"Agent teams","detail":"Research preview of multiple Claude instances coordinating in parallel (in Claude Code).","first":true,"discovered":"launch","source":"https://www.anthropic.com/news/claude-opus-4-6"},{"name":"Knowledge work (GDPval-AA)","detail":"About 144 Elo above GPT-5.2 on GDPval-AA. Also led Terminal-Bench 2.0 at launch.","first":false,"discovered":"launch","source":"https://www.anthropic.com/news/claude-opus-4-6"}],"entry":null,"notes":"First dateless-ID Opus; adaptive thinking (budget_tokens deprecated). Training data cutoff Aug 2025. Bedrock via InvokeModel only. Retirement not sooner than 2027-02-05.","verified":"2026-09-29","body_md":"Legacy Opus; migrate to `claude-opus-5-5`.\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-opus-4-6\",\"max_tokens\":16000,\"messages\":[{\"role\":\"user\",\"content\":\"Hello\"}]}'\n```\n\nSources:\n- Model page: https://platform.claude.com/docs/en/models/opus-4-6/overview\n- Announcement: https://www.anthropic.com/news/claude-opus-4-6\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-opus-4-6/","events_after":2019,"major_after":467,"historic_after":89,"missing_at_launch":77,"events_since_release":null,"you_url":"https://postcutoff.com/you/claude-opus-4-6/","briefings":{"xs":"https://postcutoff.com/briefings/cutoff-2025-05-xs.md","s":"https://postcutoff.com/briefings/cutoff-2025-05-s.md","m":"https://postcutoff.com/briefings/cutoff-2025-05-m.md","full":"https://postcutoff.com/briefings/cutoff-2025-05.md"}}