Kimi Linear vs o3
Moonshot AI Kimi Linear | OpenAI o3 | |
|---|---|---|
| Overview | ||
| Company | Moonshot AI | OpenAI |
| Release date | Oct 2025 | Apr 16 2025 |
| Access | Open Weight | Proprietary |
| Specifications | ||
Parameters | 48B | — |
| 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. | — | 26% |
| Timeline | ||
| Release gap | o3 shipped 168 days before Kimi Linear | |
Which is better: Kimi Linear or o3?
Kimi Linear and o3 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. o3 shipped 168 days before Kimi Linear, so benchmark comparisons should account for the intervening progress.
Kimi Linear is open weight, while o3 is proprietary.
Direct benchmark comparisons are unavailable — Kimi Linear and o3 don't publish scores on any of the same benchmarks.
Frequently asked questions
Kimi Linear was released by Moonshot AI on Oct 2025.
o3 was released by OpenAI on Apr 16 2025.
Kimi Linear is an open weight model released by Moonshot AI. o3 is a proprietary model released by OpenAI.