Mistral Medium 3.5 vs Grok 4.20 Beta
Mistral Mistral Medium 3.5 | SpaceXAI Grok 4.20 Beta | |
|---|---|---|
| Overview | ||
| Company | Mistral | SpaceXAI |
| Release date | Apr 29 2026 | Feb 17 2026 |
| Access | Open Weight | Proprietary |
| Specifications | ||
Parameters | 128B | — |
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. | — | 56% |
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. | 77.6% | — |
| Timeline | ||
| Release gap | Grok 4.20 Beta shipped 71 days before Mistral Medium 3.5 | |
Which is better: Mistral Medium 3.5 or Grok 4.20 Beta?
Mistral Medium 3.5 and Grok 4.20 Beta don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok 4.20 Beta shipped 71 days before Mistral Medium 3.5, so benchmark comparisons should account for the intervening progress.
Mistral Medium 3.5 is open weight, while Grok 4.20 Beta is proprietary.
Direct benchmark comparisons are unavailable — Mistral Medium 3.5 and Grok 4.20 Beta don't publish scores on any of the same benchmarks.
Frequently asked questions
Mistral Medium 3.5 was released by Mistral on Apr 29 2026.
Grok 4.20 Beta was released by SpaceXAI on Feb 17 2026.
Mistral Medium 3.5 is an open weight model released by Mistral. Grok 4.20 Beta is a proprietary model released by SpaceXAI.
Other comparisons
Mistral Medium 3.5 vs Claude Sonnet 5Grok 4.20 Beta vs Claude Sonnet 5Mistral Medium 3.5 vs GPT-5.6 SolGrok 4.20 Beta vs GPT-5.6 SolMistral Medium 3.5 vs Gemini OmniGrok 4.20 Beta vs Gemini OmniMistral Medium 3.5 vs Muse Spark 1.1Grok 4.20 Beta vs Muse Spark 1.1Mistral Medium 3.5 vs DeepSeek-V4-ProGrok 4.20 Beta vs DeepSeek-V4-ProMistral Medium 3.5 vs Kimi K2.7 CodeGrok 4.20 Beta vs Kimi K2.7 Code