{"schema":"postcutoff/model@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/m/gpt-oss-120b/","md":"https://postcutoff.com/m/gpt-oss-120b/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-120b","name":"gpt-oss-120b","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-120b"},{"provider":"OpenAI API (docs)","model_id":"gpt-oss-120b","endpoint":"https://api.openai.com/v1/responses","docs":"https://developers.openai.com/api/docs/models/gpt-oss-120b"},{"provider":"Azure OpenAI (Microsoft Foundry)","model_id":"gpt-oss-120b","docs":"https://learn.microsoft.com/en-us/azure/foundry/foundry-models/concepts/models-sold-directly-by-azure"},{"provider":"OpenRouter","model_id":"openai/gpt-oss-120b","url":"https://openrouter.ai/openai/gpt-oss-120b"}],"capabilities":[{"name":"Single-GPU open MoE","detail":"117B total / 5.1B active MoE with MXFP4 weights; runs on one 80GB H100/MI300X.","first":false,"discovered":"launch","source":"https://huggingface.co/openai/gpt-oss-120b"},{"name":"Open reasoning with full CoT","detail":"Configurable low/medium/high reasoning with full chain-of-thought access, harmony format.","first":false,"discovered":"launch","source":"https://huggingface.co/openai/gpt-oss-120b"}],"entry":null,"notes":"Open weights (Apache 2.0). OpenRouter from ~$0.04/$0.17 per 1M (provider-dependent). No first-party OpenAI pricing listed.","verified":"2026-09-29","body_md":"Self-hosted reasoning/agents via vLLM, Transformers, Ollama, LM Studio.\n\n```bash\nvllm serve openai/gpt-oss-120b\n```\n\nSources:\n- https://huggingface.co/openai/gpt-oss-120b\n- https://developers.openai.com/api/docs/models/gpt-oss-120b\n- Models overview: https://developers.openai.com/api/docs/models","page_url":"https://postcutoff.com/m/gpt-oss-120b/","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-120b/","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"}}