Models · Compare
Kimi K2 Instruct vs Grok 4
Rows highlighted in warm gray are where the models differ. Numbers carry their as-of date and primary source.
Specs
| Field | A: Kimi K2 Instruct | B: Grok 4 |
|---|---|---|
| Released | 2025-07-11 | — |
| Developer | Moonshot AI | xAI |
| Openness | Open | Proprietary |
| License | Modified MIT | Proprietary |
| OSI-approved | no | no |
| Data released | no | no |
| Training code | no | no |
| Architecture | moe | unknown |
| Total params | 1T | — |
| Active params | 32B | — |
| Experts | 384 (8 active) | — |
| Context window | 128K | — |
| Attention | mla | unknown |
| Position enc. | rope | unknown |
| Pretraining tokens | 15.5T | — |
| Post-training | sft, rlhf | rlhf |
| Training hardware | — | — |
| $/M input | — | $5.50 |
| $/M output | — | $27.50 |
| Output tok/sec | — | 0 |
Benchmarks
Missing scores render as not reported; never inferred. Bold highlights the leader per benchmark.
General reasoning
| MMLU-Pro | 81.1 2025-07-15 | 86.6 2026-05-21 |
| GPQA-Diamond | 75.1 2025-07-15 | 87.7 2026-05-21 |
Code
| SWE-Bench Verified | 65.8 2025-07-15 | — |
| LiveCodeBench | — | 81.9 2026-05-21 |
Math
| MATH | — | 99.0 2026-05-21 |
| AIME 2024 | — | 94.3 2026-05-21 |
| AIME 2025 | — | 92.7 2026-05-21 |
Context · A
A trillion-parameter open-weights MoE optimized for agentic tool-use, with strong SWE-Bench results making it a viable open alternative to closed coding agents at release.
Context · B
xAI's flagship after Grok 3, released July 9 2025 and formally announced the next day. Grok 4 Heavy variant reported 50.7 percent on the text-only Humanity's Last Exam subset, a first for any model per xAI. A specialized coding variant followed shortly after.