{"schema":"postcutoff/model@1","as_of":"2026-10-08T23:45:00+02:00","url":"https://postcutoff.com/m/claude-haiku-5-5/","md":"https://postcutoff.com/m/claude-haiku-5-5/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"Adam Bicz","policy":"https://postcutoff.com/about/"},"license":null,"id":"claude-haiku-5-5","name":"Claude Haiku 5.5","org":"Anthropic","family":"Claude 5","released":"2026-10-07","status":"current","type":"reasoning-llm","modality_in":["text","image"],"modality_out":["text"],"open_weights":false,"model_license":"proprietary","context_window":1000000,"max_output":128000,"knowledge_cutoff":"2026-06","pricing":{"input":0.1,"output":0.5,"cache_read":0.01,"unit":"per 1M tokens (USD) for prompts up to 100K tokens; above 100K: $0.50 input / $2.50 output / $0.05 cache read; 5-min cache write $0.125 ($0.625 >100K); Batch API 50% off","source":"https://platform.claude.com/docs/en/models/haiku-5-5/overview"},"price_line":"$0.10 in, $0.50 out per 1M tokens","access":[{"provider":"Anthropic API (Claude API)","model_id":"claude-haiku-5-5","endpoint":"https://api.anthropic.com/v1/messages","docs":"https://platform.claude.com/docs/en/models/haiku-5-5/overview"},{"provider":"AWS Bedrock","model_id":"anthropic.claude-haiku-5-5","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock"},{"provider":"Google Cloud Vertex AI","model_id":"claude-haiku-5-5","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai"},{"provider":"Microsoft Foundry (Azure)","model_id":"claude-haiku-5-5","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry"},{"provider":"Claude Platform on AWS","model_id":"claude-haiku-5-5","docs":"https://platform.claude.com/docs/en/build-with-claude/claude-platform-on-aws"},{"provider":"Web app","url":"https://claude.ai"}],"capabilities":[{"name":"First Haiku with effort control","detail":"Adaptive thinking steered by the effort parameter (low, medium, high, xhigh, max; default medium); thinking: {type: disabled} works at high effort or below and returns 400 at xhigh/max; per-message effort changes in beta.","first":true,"discovered":"launch","source":"https://platform.claude.com/docs/en/build-with-claude/effort"},{"name":"Two-tier long-context pricing","detail":"$0.10/$0.50 per MTok up to 100K prompt tokens, five times that above 100K; 90% below Haiku 4.5 and equal to GPT-6 Luna at the low tier.","first":false,"discovered":"launch","source":"https://platform.claude.com/docs/en/models/haiku-5-5/overview"},{"name":"Frontier-level prompt-injection robustness in a small model","detail":"System card: Gray Swan IPI attack success at k=15 of 7.1% (Haiku 4.5: 83.2%); 0.08% against the Shade adaptive coding attacker (Haiku 4.5: 58.40%).","first":false,"discovered":"launch","source":"https://www.anthropic.com/document/claude-haiku-5-5-system-card"},{"name":"Strong computer use for its price","detail":"Anthropic reports OSWorld 2.1 at 72.4%, versus 48.9% for GPT-6 Luna.","first":false,"discovered":"launch","source":"https://www.anthropic.com/claude-haiku-5-5"}],"entry":"2026-10-07-claude-haiku-5-5","notes":"Anthropic's fastest and cheapest current model, for classification, extraction, routing and subagents. Uses the Claude 4.7+ tokenizer (~30% more tokens than Haiku 4.5 for the same text). Migrating from Haiku 4.5: manual extended thinking (budget_tokens) returns 400; responses can begin with thinking blocks. Non-default temperature/top_p/top_k return 400. Batch API supports 300K output with the output-300k-2026-03-24 beta header. Retirement not sooner than 2027-10-07.","verified":"2026-10-08","body_md":"Cheapest Claude 5.5 model; the long-context surcharge starts at 100K prompt tokens.\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-haiku-5-5\",\"max_tokens\":4000,\"output_config\":{\"effort\":\"low\"},\"messages\":[{\"role\":\"user\",\"content\":\"Classify: ...\"}]}'\n```\n\nSources:\n- Model page: https://platform.claude.com/docs/en/models/haiku-5-5/overview\n- Announcement: https://www.anthropic.com/claude-haiku-5-5\n- System card: https://www.anthropic.com/document/claude-haiku-5-5-system-card\n- Models overview: https://platform.claude.com/docs/en/about-claude/models/overview","page_url":"https://postcutoff.com/m/claude-haiku-5-5/","events_after":711,"major_after":174,"historic_after":36,"missing_at_launch":671,"events_since_release":null,"you_url":"https://postcutoff.com/you/claude-haiku-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"}}