{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/gpt-oss-20b/","md":"https://postcutoff.com/m/gpt-oss-20b/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-oss-20b","name":"gpt-oss-20b","org":"OpenAI","family":"gpt-oss","released":"2025-08-05","status":"current","type":"reasoning-llm","modality_in":["text"],"modality_out":["text"],"open_weights":true,"model_license":"apache-2.0","context_window":131072,"max_output":131072,"knowledge_cutoff":"2024-06","pricing":null,"price_line":"Price not published","access":[{"provider":"Hugging Face","url":"https://huggingface.co/openai/gpt-oss-20b"},{"provider":"OpenAI API (docs)","model_id":"gpt-oss-20b","endpoint":"https://api.openai.com/v1/responses","docs":"https://developers.openai.com/api/docs/models/gpt-oss-20b"},{"provider":"Azure OpenAI (Microsoft Foundry)","model_id":"gpt-oss-20b","docs":"https://learn.microsoft.com/en-us/azure/foundry/foundry-models/concepts/models-sold-directly-by-azure"},{"provider":"OpenRouter","model_id":"openai/gpt-oss-20b","url":"https://openrouter.ai/openai/gpt-oss-20b"}],"capabilities":[{"name":"Laptop-class open reasoning","detail":"21B total / 3.6B active MoE in MXFP4; runs in ~16GB memory.","first":false,"discovered":"launch","source":"https://huggingface.co/openai/gpt-oss-20b"},{"name":"Fine-tunable on consumer hardware","detail":"Apache 2.0 weights, fine-tunable locally; function calling and structured outputs.","first":false,"discovered":"launch","source":"https://huggingface.co/openai/gpt-oss-20b"}],"entry":null,"notes":"Open weights (Apache 2.0). Azure lists it as Preview. Safety-classifier variant openai/gpt-oss-safeguard-20b also on OpenRouter.","verified":"2026-09-29","body_md":"Local/on-device reasoning.\n\n```bash\nollama run gpt-oss:20b\n```\n\nSources:\n- https://huggingface.co/openai/gpt-oss-20b\n- https://developers.openai.com/api/docs/models/gpt-oss-20b\n- Models overview: https://developers.openai.com/api/docs/models","page_url":"https://postcutoff.com/m/gpt-oss-20b/","events_after":2060,"major_after":490,"historic_after":98,"missing_at_launch":51,"events_since_release":null,"you_url":"https://postcutoff.com/you/gpt-oss-20b/","briefings":{"xs":"https://postcutoff.com/briefings/cutoff-2024-06-xs.md","s":"https://postcutoff.com/briefings/cutoff-2024-06-s.md","m":"https://postcutoff.com/briefings/cutoff-2024-06-m.md","full":"https://postcutoff.com/briefings/cutoff-2024-06.md"}}