{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/gpt-6-astra/","md":"https://postcutoff.com/m/gpt-6-astra/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-6-astra","name":"GPT-6 Astra","org":"OpenAI","family":"GPT-6","released":"2026-09-03","status":"current","type":"reasoning-llm","modality_in":["text","image"],"modality_out":["text"],"open_weights":false,"model_license":"proprietary","context_window":1050000,"max_output":128000,"knowledge_cutoff":"2026-04","pricing":{"input":10,"cached_input":1,"output":50,"cache_write":12.5,"unit_note":"prompts >272K input tokens billed at 2x input and cache rates","unit":"per 1M tokens (USD), standard tier","source":"https://developers.openai.com/api/docs/pricing"},"price_line":"$10 in, $50 out per 1M tokens","access":[{"provider":"OpenAI API","model_id":"gpt-6-astra","endpoint":"https://api.openai.com/v1/responses","docs":"https://developers.openai.com/api/docs/models/gpt-6-astra"},{"provider":"Azure OpenAI (Microsoft Foundry)","model_id":"gpt-6-astra","docs":"https://learn.microsoft.com/en-us/azure/foundry/foundry-models/concepts/models-sold-directly-by-azure"},{"provider":"OpenRouter","model_id":"openai/gpt-6-astra","url":"https://openrouter.ai/openai/gpt-6-astra"},{"provider":"Web app","url":"https://chatgpt.com"}],"capabilities":[{"name":"Max reasoning effort","detail":"reasoning.effort adds a new \"max\" level above xhigh (low/medium/high/xhigh/max).","first":false,"discovered":"launch","source":"https://developers.openai.com/api/docs/models/gpt-6-astra"},{"name":"1M-token context","detail":"1.05M context window (922K max input) with 128K output on the flagship.","first":false,"discovered":"launch","source":"https://developers.openai.com/api/docs/models/gpt-6-astra"},{"name":"Restricted cyber behaviour","detail":"Released as a restricted version that rejects certain cybersecurity prompts; separate Cyber/Daybreak models exist for that domain.","first":false,"discovered":"launch","source":"https://en.wikipedia.org/wiki/GPT-6_Astra"},{"name":"Recurrent-depth reasoning","detail":"Reported new \"recurrent depth\" technique that obscures some of the reasoning, raising monitorability concerns among safety researchers.","first":false,"discovered":"later","source":"https://en.wikipedia.org/wiki/GPT-6_Astra"},{"name":"Ultrafast service tier","detail":"From Sept 29 2026, service_tier \"ultrafast\" gives up to 6x faster generation in the API (8x / ~300 tok/s in Codex) at 6x price: $60 input / $6 cached / $75 cache write / $300 output per 1M tokens (<=272K ctx); default limits 500K-5M TPM.","first":false,"discovered":"later","source":"https://developers.openai.com/api/docs/guides/ultrafast-mode"},{"name":"Powers dots always-on agents","detail":"OpenAI's dots (launched Sept 29 2026) run on GPT-6 Astra, each with its own cloud computer; also the default model in Agents API computer-use examples.","first":false,"discovered":"later","source":"https://openai.com/index/introducing-dots/"}],"entry":null,"notes":"OpenAI flagship (\"most capable model, built for the hardest end-to-end work\"). API changelog: Sep 3 2026 (limited preview Sep 3, public Sep 4). Single snapshot gpt-6-astra. OpenRouter also lists openai/gpt-6-astra-pro = same model with reasoning.mode pro. Endpoints: Chat Completions, Responses, Batch.","verified":"2026-09-29","body_md":"Hardest end-to-end work: long-horizon agentic coding, research, analysis, computer use.\n\n```bash\ncurl https://api.openai.com/v1/responses \\\n -H \"Authorization: Bearer $OPENAI_API_KEY\" -H \"Content-Type: application/json\" \\\n -d '{\"model\":\"gpt-6-astra\",\"input\":\"Hello\"}'\n```\n\nSources:\n- https://developers.openai.com/api/docs/models/gpt-6-astra\n- https://developers.openai.com/api/docs/pricing\n- https://developers.openai.com/api/docs/changelog\n- https://en.wikipedia.org/wiki/GPT-6_Astra\n- Ultrafast: https://developers.openai.com/api/docs/guides/ultrafast-mode\n- Models overview: https://developers.openai.com/api/docs/models","page_url":"https://postcutoff.com/m/gpt-6-astra/","events_after":1863,"major_after":426,"historic_after":83,"missing_at_launch":271,"events_since_release":null,"you_url":"https://postcutoff.com/you/gpt-6-astra/","briefings":{"xs":"https://postcutoff.com/briefings/cutoff-2026-04-xs.md","s":"https://postcutoff.com/briefings/cutoff-2026-04-s.md","m":"https://postcutoff.com/briefings/cutoff-2026-04-m.md","full":"https://postcutoff.com/briefings/cutoff-2026-04.md"}}