{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/claude-sonnet-4-5/","md":"https://postcutoff.com/m/claude-sonnet-4-5/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-4-5","name":"Claude Sonnet 4.5","org":"Anthropic","family":"Claude 4","released":"2025-09-29","status":"deprecated","type":"reasoning-llm","modality_in":["text","image","pdf"],"modality_out":["text"],"open_weights":false,"model_license":"proprietary","context_window":200000,"max_output":64000,"knowledge_cutoff":"2025-01","pricing":{"input":3,"output":15,"cache_read":0.3,"unit":"per 1M tokens (USD); Batch API 50% off","source":"https://platform.claude.com/docs/en/about-claude/pricing"},"price_line":"$3 in, $15 out per 1M tokens","access":[{"provider":"Anthropic API (Claude API)","model_id":"claude-sonnet-4-5-20250929","alias":"claude-sonnet-4-5","endpoint":"https://api.anthropic.com/v1/messages","docs":"https://platform.claude.com/docs/en/models/sonnet-4-5/overview"},{"provider":"AWS Bedrock (InvokeModel)","model_id":"anthropic.claude-sonnet-4-5-20250929-v1:0","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-on-amazon-bedrock-legacy"},{"provider":"Google Cloud Vertex AI","model_id":"claude-sonnet-4-5@20250929","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai"},{"provider":"Microsoft Foundry (Azure)","model_id":"claude-sonnet-4-5","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry"},{"provider":"Claude Platform on AWS","model_id":"claude-sonnet-4-5","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws"},{"provider":"OpenRouter","model_id":"anthropic/claude-sonnet-4.5","url":"https://openrouter.ai/anthropic/claude-sonnet-4.5"},{"provider":"Web app","url":"https://claude.ai"}],"capabilities":[{"name":"30+ hour autonomous tasks","detail":"Anthropic reported it maintained focus for more than 30 hours on complex multi-step tasks.","first":false,"discovered":"launch","source":"https://www.anthropic.com/news/claude-sonnet-4-5"},{"name":"SOTA SWE-bench Verified at launch","detail":"77.2% on SWE-bench Verified; billed as 'the best coding model in the world' at release.","first":false,"discovered":"launch","source":"https://www.anthropic.com/news/claude-sonnet-4-5"},{"name":"Computer use lead","detail":"61.4% on OSWorld, up from 42.2% for Sonnet 4.","first":false,"discovered":"launch","source":"https://www.anthropic.com/news/claude-sonnet-4-5"}],"entry":null,"notes":"Snapshot claude-sonnet-4-5-20250929 (alias claude-sonnet-4-5). Extended thinking only. Training data cutoff Jul 2025. Deprecated on 2026-09-30; retirement on the Claude API scheduled for 2026-11-30 (Anthropic recommends migrating to Claude Sonnet 5.5). Source: https://platform.claude.com/docs/en/release-notes/overview","verified":"2026-10-02","body_md":"Legacy Sonnet; migrate to `claude-sonnet-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-sonnet-4-5\",\"max_tokens\":16000,\"messages\":[{\"role\":\"user\",\"content\":\"Hello\"}]}'\n```\n\nSources:\n- Model page: https://platform.claude.com/docs/en/models/sonnet-4-5/overview\n- Announcement: https://www.anthropic.com/news/claude-sonnet-4-5\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-4-5/","events_after":2037,"major_after":476,"historic_after":90,"missing_at_launch":43,"events_since_release":null,"you_url":null,"briefings":{"xs":"https://postcutoff.com/briefings/cutoff-2025-01-xs.md","s":"https://postcutoff.com/briefings/cutoff-2025-01-s.md","m":"https://postcutoff.com/briefings/cutoff-2025-01-m.md","full":"https://postcutoff.com/briefings/cutoff-2025-01.md"}}