{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/claude-opus-4-5/","md":"https://postcutoff.com/m/claude-opus-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-opus-4-5","name":"Claude Opus 4.5","org":"Anthropic","family":"Claude 4","released":"2025-11-24","status":"legacy","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":"2025-05","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-4-5-20251101","alias":"claude-opus-4-5","endpoint":"https://api.anthropic.com/v1/messages","docs":"https://platform.claude.com/docs/en/models/opus-4-5/overview"},{"provider":"AWS Bedrock (InvokeModel)","model_id":"anthropic.claude-opus-4-5-20251101-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-opus-4-5@20251101","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai"},{"provider":"Microsoft Foundry (Azure)","model_id":"claude-opus-4-5","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry"},{"provider":"Claude Platform on AWS","model_id":"claude-opus-4-5","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws"},{"provider":"OpenRouter","model_id":"anthropic/claude-opus-4.5","url":"https://openrouter.ai/anthropic/claude-opus-4.5"},{"provider":"Web app","url":"https://claude.ai"}],"capabilities":[{"name":"Beat all human candidates on Anthropic's engineering exam","detail":"Scored higher than any human candidate on Anthropic's take-home engineering exam within the 2-hour limit.","first":true,"discovered":"launch","source":"https://www.anthropic.com/news/claude-opus-4-5"},{"name":"Effort parameter","detail":"First model with the effort parameter. At medium effort it matched Sonnet 4.5's best score with 76% fewer output tokens.","first":true,"discovered":"launch","source":"https://www.anthropic.com/news/claude-opus-4-5"},{"name":"Prompt-injection robustness","detail":"Anthropic claimed it was harder to trick with prompt injection than any other frontier model at the time.","first":false,"discovered":"launch","source":"https://www.anthropic.com/news/claude-opus-4-5"},{"name":"Opus price cut","detail":"Opus-class pricing dropped to $5/$25 per MTok, from $15/$75.","first":false,"discovered":"launch","source":"https://www.anthropic.com/news/claude-opus-4-5"}],"entry":null,"notes":"Snapshot claude-opus-4-5-20251101 (alias claude-opus-4-5). Extended thinking (budget_tokens); effort low/medium/high. Training data cutoff Aug 2025. Retirement not sooner than 2026-11-24.","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-4-5\",\"max_tokens\":16000,\"messages\":[{\"role\":\"user\",\"content\":\"Hello\"}]}'\n```\n\nSources:\n- Model page: https://platform.claude.com/docs/en/models/opus-4-5/overview\n- Announcement: https://www.anthropic.com/news/claude-opus-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-opus-4-5/","events_after":2019,"major_after":467,"historic_after":89,"missing_at_launch":45,"events_since_release":null,"you_url":"https://postcutoff.com/you/claude-opus-4-5/","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"}}