Kimi K2.5 vs GPT-5.6 Sol
Moonshot AI Kimi K2.5 | OpenAI GPT-5.6 Sol | |
|---|---|---|
| Overview | ||
| Company | Moonshot AI | OpenAI |
| Release date | Jan 27 2026 | Jun 26 2026 |
| Access | Open Weight | Proprietary |
| Specifications | ||
Parameters | 1T | — |
Context window | 256k | — |
| 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. | 52% | — |
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 76.8% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 87.6% | — |
| Timeline | ||
| Release gap | Kimi K2.5 shipped 150 days before GPT-5.6 Sol | |
Which is better: Kimi K2.5 or GPT-5.6 Sol?
Kimi K2.5 and GPT-5.6 Sol don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Kimi K2.5 shipped 150 days before GPT-5.6 Sol, so benchmark comparisons should account for the intervening progress.
Kimi K2.5 is open weight, while GPT-5.6 Sol is proprietary.
Direct benchmark comparisons are unavailable — Kimi K2.5 and GPT-5.6 Sol don't publish scores on any of the same benchmarks.
Frequently asked questions
Kimi K2.5 was released by Moonshot AI on Jan 27 2026.
GPT-5.6 Sol was released by OpenAI on Jun 26 2026.
Kimi K2.5 is an open weight model released by Moonshot AI. GPT-5.6 Sol is a proprietary model released by OpenAI.
Other comparisons
Kimi K2.5 vs Claude Fable 5GPT-5.6 Sol vs Claude Fable 5Kimi K2.5 vs Gemini OmniGPT-5.6 Sol vs Gemini OmniKimi K2.5 vs Muse SparkGPT-5.6 Sol vs Muse SparkKimi K2.5 vs Grok 4.3 BetaGPT-5.6 Sol vs Grok 4.3 BetaKimi K2.5 vs DeepSeek-V4-ProGPT-5.6 Sol vs DeepSeek-V4-ProKimi K2.5 vs Mistral Medium 3.5GPT-5.6 Sol vs Mistral Medium 3.5