Kimi K2 (0905) vs Grok 4.5
Moonshot AI Kimi K2 (0905) | SpaceXAI Grok 4.5 | |
|---|---|---|
| Overview | ||
| Company | Moonshot AI | SpaceXAI |
| Release date | Sep 5 2025 | Jul 8 2026 |
| Access | Open Weight | Proprietary |
| Specifications | ||
Parameters | 1T | — |
Context window | 256k | — |
| Benchmarks | ||
Agentic coding SWE-Bench ProCan the AI fix real bugs in real software? It's handed actual problems from open-source projects and has to write code that genuinely solves them. Higher is better. | — | 64.7% |
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. | 65.8% | — |
Multilingual coding SWE-Bench MultilingualLike SWE-Bench, but the coding problems span many programming languages, not just one. Tests how broadly the AI can code. Higher is better. | — | 78% |
Agentic coding DeepSWE 1.0Artificial Analysis' independent test of deep, agentic software-engineering work — the AI has to plan and carry out substantial coding tasks end to end. Higher is better. | — | 62% |
Agentic terminal coding Terminal-Bench 2.1Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Higher is better. | — | 83.3% |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 75.1% | — |
| Timeline | ||
| Release gap | Kimi K2 (0905) shipped 306 days before Grok 4.5 | |
Which is better: Kimi K2 (0905) or Grok 4.5?
Kimi K2 (0905) and Grok 4.5 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Kimi K2 (0905) shipped 306 days before Grok 4.5, so benchmark comparisons should account for the intervening progress.
Kimi K2 (0905) is open weight, while Grok 4.5 is proprietary.
Direct benchmark comparisons are unavailable — Kimi K2 (0905) and Grok 4.5 don't publish scores on any of the same benchmarks.
Frequently asked questions
Kimi K2 (0905) was released by Moonshot AI on Sep 5 2025.
Grok 4.5 was released by SpaceXAI on Jul 8 2026.
Kimi K2 (0905) is an open weight model released by Moonshot AI. Grok 4.5 is a proprietary model released by SpaceXAI.
Other comparisons
Kimi K2 (0905) vs Claude Sonnet 5Grok 4.5 vs Claude Sonnet 5Kimi K2 (0905) vs GPT-5.6 SolGrok 4.5 vs GPT-5.6 SolKimi K2 (0905) vs Gemini OmniGrok 4.5 vs Gemini OmniKimi K2 (0905) vs Muse SparkGrok 4.5 vs Muse SparkKimi K2 (0905) vs DeepSeek-V4-ProGrok 4.5 vs DeepSeek-V4-ProKimi K2 (0905) vs Mistral Medium 3.5Grok 4.5 vs Mistral Medium 3.5