Model page
GPT OSS 120b
OpenAI's open-weight 117B MoE via Fireworks. Production-grade reasoning, agentic tasks, function calling. 131k context. Does not support web search or image input.
Key dates
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ChatGPT
GPT‑4o retirement (ChatGPT)
OpenAI is retiring GPT‑4o inside ChatGPT on February 13, 2026. This does not automatically imply API removal.