{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/gpt-5-6-sol/","md":"https://postcutoff.com/m/gpt-5-6-sol/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-5-6-sol","name":"GPT-5.6 Sol","org":"OpenAI","family":"GPT-5.6","released":"2026-07-09","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":"2026-02","pricing":{"input":4,"cached_input":0.4,"output":20,"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":"$4 in, $20 out per 1M tokens","access":[{"provider":"OpenAI API","model_id":"gpt-5.6-sol","endpoint":"https://api.openai.com/v1/responses","docs":"https://developers.openai.com/api/docs/models/gpt-5.6-sol"},{"provider":"Azure OpenAI (Microsoft Foundry)","model_id":"gpt-5.6-sol","docs":"https://learn.microsoft.com/en-us/azure/foundry/foundry-models/concepts/models-sold-directly-by-azure"},{"provider":"OpenRouter","model_id":"openai/gpt-5.6-sol","url":"https://openrouter.ai/openai/gpt-5.6-sol"},{"provider":"Web app","url":"https://chatgpt.com"}],"capabilities":[{"name":"Named-tier family","detail":"GPT-5.6 introduced the Sol/Terra/Luna tier names (flagship/balanced/fast) replacing pro/mini/nano naming.","first":false,"discovered":"launch","source":"https://developers.openai.com/api/docs/changelog"},{"name":"Max reasoning effort","detail":"Reasoning effort none/low/medium/high/xhigh/max.","first":false,"discovered":"launch","source":"https://developers.openai.com/api/docs/models/gpt-5.6-sol"},{"name":"Fast mode long context","detail":"Fast mode extended to long-context requests on Aug 5 2026.","first":false,"discovered":"later","source":"https://developers.openai.com/api/docs/changelog"}],"entry":null,"notes":"GPT-5.6 flagship; the gpt-5.6 alias routes here. Superseded by GPT-6 Sol/Astra but still offered. OpenRouter lists $2/$10, lower than OpenAI list price $4/$20.","verified":"2026-09-29","body_md":"Previous flagship; replacement target for deprecated gpt-5/o3 snapshots.\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-5.6-sol\",\"input\":\"Hello\"}'\n```\n\nSources:\n- https://developers.openai.com/api/docs/models/gpt-5.6-sol\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-5-6-sol/","events_after":1919,"major_after":439,"historic_after":85,"missing_at_launch":138,"events_since_release":null,"you_url":"https://postcutoff.com/you/gpt-5-6-sol/","briefings":{"xs":"https://postcutoff.com/briefings/cutoff-2026-02-xs.md","s":"https://postcutoff.com/briefings/cutoff-2026-02-s.md","m":"https://postcutoff.com/briefings/cutoff-2026-02-m.md","full":"https://postcutoff.com/briefings/cutoff-2026-02.md"}}