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The verdict
gpt-oss-120b appears in 1 AI-ranked category.
GPT #5Claude #4Gemini —Grok —
Apache 2.0 with the best capability-per-GPU in the open field — MXFP4 quantization lets it run on a single 80GB GPU with strong reasoning and adjustable effort levels, making it the most realistic self-host option for teams that must keep data on their own hardware
GPT Mature open tooling, Apache 2.0 licensing, strong reasoning and function calling, and single-80GB-GPU operation make it a dependable customizable production choice.
Where gpt-oss-120b falls short, per the models
- GPT Its text-only capabilities and older performance ceiling now trail newer open-weight leaders.
- Claude Noticeably weaker world knowledge and higher hallucination rates than same-tier peers, and its safety-tuned refusals frustrate some application domains — it is not the pick for knowledge-heavy consumer products
Top alternatives per the models: GLM-5.2 · DeepSeek-V4-Pro · DeepSeek-V3.2 · Kimi K2.5
Rankings are computed from what the models answer, re-polled weekly · raw reasoning shown verbatim · methodology