{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/gpt-5-5/","md":"https://postcutoff.com/m/gpt-5-5/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":"gpt-5-5","name":"GPT-5.5","org":"OpenAI","family":"GPT-5","released":"2026-04-24","status":"legacy","type":"reasoning-llm","modality_in":["text","image"],"modality_out":["text"],"open_weights":false,"model_license":"proprietary","context_window":1050000,"max_output":128000,"knowledge_cutoff":"2025-12","pricing":{"input":5,"cached_input":0.5,"output":30,"unit_note":"prompts >272K input tokens billed 2x input / 1.5x output","unit":"per 1M tokens (USD), standard tier","source":"https://developers.openai.com/api/docs/pricing"},"price_line":"$5 in, $30 out per 1M tokens","access":[{"provider":"OpenAI API","model_id":"gpt-5.5","endpoint":"https://api.openai.com/v1/responses","docs":"https://developers.openai.com/api/docs/models/gpt-5.5"},{"provider":"Azure OpenAI (Microsoft Foundry)","model_id":"gpt-5.5","docs":"https://learn.microsoft.com/en-us/azure/foundry/foundry-models/concepts/models-sold-directly-by-azure"},{"provider":"OpenRouter","model_id":"openai/gpt-5.5","url":"https://openrouter.ai/openai/gpt-5.5"},{"provider":"Web app","url":"https://chatgpt.com"}],"capabilities":[{"name":"xhigh reasoning effort","detail":"Reasoning effort none/low/medium/high/xhigh.","first":false,"discovered":"launch","source":"https://developers.openai.com/api/docs/models/gpt-5.5"},{"name":"1M context","detail":"1.05M context window with 128K output.","first":false,"discovered":"launch","source":"https://developers.openai.com/api/docs/models/gpt-5.5"}],"entry":null,"notes":"Snapshot gpt-5.5-2026-04-23. Superseded by GPT-5.6 and GPT-6; still available.","verified":"2026-09-29","body_md":"```bash\ncurl https://api.openai.com/v1/responses \\\n -H \"Authorization: Bearer $OPENAI_API_KEY\" -H \"Content-Type: application/json\" \\\n -d '{\"model\":\"gpt-5.5\",\"input\":\"Hello\"}'\n```\n\nSources:\n- https://developers.openai.com/api/docs/models/gpt-5.5\n- https://developers.openai.com/api/docs/pricing\n- https://developers.openai.com/api/docs/changelog\n- Models overview: https://developers.openai.com/api/docs/models","page_url":"https://postcutoff.com/m/gpt-5-5/","events_after":1962,"major_after":449,"historic_after":85,"missing_at_launch":93,"events_since_release":null,"you_url":"https://postcutoff.com/you/gpt-5-5/","briefings":{"xs":"https://postcutoff.com/briefings/cutoff-2025-12-xs.md","s":"https://postcutoff.com/briefings/cutoff-2025-12-s.md","m":"https://postcutoff.com/briefings/cutoff-2025-12-m.md","full":"https://postcutoff.com/briefings/cutoff-2025-12.md"}}