Kimi K1.5 vs gpt-oss-120b
Moonshot AI Kimi K1.5 | OpenAI gpt-oss-120b | |
|---|---|---|
| Overview | ||
| Company | Moonshot AI | OpenAI |
| Release date | Jan 20 2025 | Aug 5 2025 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Context window | 128k | — |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | — | 11% |
| Timeline | ||
| Release gap | Kimi K1.5 shipped 197 days before gpt-oss-120b | |
Which is better: Kimi K1.5 or gpt-oss-120b?
Kimi K1.5 and gpt-oss-120b don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Kimi K1.5 shipped 197 days before gpt-oss-120b, so benchmark comparisons should account for the intervening progress.
Kimi K1.5 is proprietary, while gpt-oss-120b is open weight.
Direct benchmark comparisons are unavailable — Kimi K1.5 and gpt-oss-120b don't publish scores on any of the same benchmarks.
Frequently asked questions
Kimi K1.5 was released by Moonshot AI on Jan 20 2025.
gpt-oss-120b was released by OpenAI on Aug 5 2025.
Kimi K1.5 is a proprietary model released by Moonshot AI. gpt-oss-120b is an open weight model released by OpenAI.
Other comparisons
Kimi K1.5 vs Claude Sonnet 5gpt-oss-120b vs Claude Sonnet 5Kimi K1.5 vs Gemini Omnigpt-oss-120b vs Gemini OmniKimi K1.5 vs Muse Spark 1.1gpt-oss-120b vs Muse Spark 1.1Kimi K1.5 vs Grok 4.5gpt-oss-120b vs Grok 4.5Kimi K1.5 vs DeepSeek-V4-Progpt-oss-120b vs DeepSeek-V4-ProKimi K1.5 vs Mistral Medium 3.5gpt-oss-120b vs Mistral Medium 3.5