Moonshot AI Kimi K1.5 vs xAI Grok Code Fast 1 — side-by-side specs.
Moonshot AI Kimi K1.5 | xAI Grok Code Fast 1 | |
|---|---|---|
| Overview | ||
| Company | Moonshot AI | xAI |
| Release date | Jan 20 2025 | Aug 28 2025 |
| Model type | — | — |
| Open source | No | No |
| Specifications | ||
Parameters | — | — |
Context window | 128k | — |
| Benchmarks | ||
Science reasoning GPQA Diamond | — | — |
Software engineering SWE-Bench Verified | — | — |
Multimodal understanding MMMU | — | — |
| Timeline | ||
| Release gap | Kimi K1.5 shipped 220 days before Grok Code Fast 1 | |
Kimi K1.5 and Grok Code Fast 1 do not have directly comparable benchmark scores published on GPQA Diamond, SWE-Bench Verified, or MMMU. Kimi K1.5 shipped 220 days before Grok Code Fast 1, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
Direct benchmark comparisons are unavailable — at least one of these models has not published scores on GPQA Diamond, SWE-Bench Verified, or MMMU.