{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/claude-opus-4-8/","md":"https://postcutoff.com/m/claude-opus-4-8/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-4-8","name":"Claude Opus 4.8","org":"Anthropic","family":"Claude 4","released":"2026-05-28","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":"2026-01","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-4-8","endpoint":"https://api.anthropic.com/v1/messages","docs":"https://platform.claude.com/docs/en/models/opus-4-8/overview"},{"provider":"AWS Bedrock (Messages API / Mantle)","model_id":"anthropic.claude-opus-4-8","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock"},{"provider":"Google Cloud Vertex AI","model_id":"claude-opus-4-8","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai"},{"provider":"Microsoft Foundry (Azure)","model_id":"claude-opus-4-8","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry"},{"provider":"Claude Platform on AWS","model_id":"claude-opus-4-8","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws"},{"provider":"OpenRouter","model_id":"anthropic/claude-opus-4.8","url":"https://openrouter.ai/anthropic/claude-opus-4.8"},{"provider":"Web app","url":"https://claude.ai"}],"capabilities":[{"name":"Code honesty","detail":"About 4x less likely than Opus 4.7 to let flaws in its own code pass without comment.","first":false,"discovered":"launch","source":"https://www.anthropic.com/news/claude-opus-4-8"},{"name":"Browser agents","detail":"Scored 84% on Online-Mind2Web, ahead of Opus 4.7 and GPT-5.5.","first":false,"discovered":"launch","source":"https://www.anthropic.com/news/claude-opus-4-8"},{"name":"Legal agent benchmark","detail":"Anthropic says it was the first model to exceed 10% on the Legal Agent Benchmark all-pass standard.","first":true,"discovered":"launch","source":"https://www.anthropic.com/news/claude-opus-4-8"},{"name":"Cheaper fast mode","detail":"Fast mode runs up to 2.5x faster, at a lower premium than earlier fast mode.","first":false,"discovered":"launch","source":"https://www.anthropic.com/news/claude-opus-4-8"}],"entry":null,"notes":"Last Opus 4.x. Adaptive thinking only (omit thinking = no thinking); sampling params and budget_tokens removed. Fast mode $10/$50 (Claude API only). Retirement not sooner than 2027-05-28.","verified":"2026-09-29","body_md":"Legacy; common fallback target for refusals on Claude 5 models.\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-4-8\",\"max_tokens\":16000,\"messages\":[{\"role\":\"user\",\"content\":\"Hello\"}]}'\n```\n\nSources:\n- Model page: https://platform.claude.com/docs/en/models/opus-4-8/overview\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-4-8/","events_after":1945,"major_after":444,"historic_after":85,"missing_at_launch":110,"events_since_release":null,"you_url":"https://postcutoff.com/you/claude-opus-4-8/","briefings":{"xs":"https://postcutoff.com/briefings/cutoff-2026-01-xs.md","s":"https://postcutoff.com/briefings/cutoff-2026-01-s.md","m":"https://postcutoff.com/briefings/cutoff-2026-01-m.md","full":"https://postcutoff.com/briefings/cutoff-2026-01.md"}}