Mistral Medium 3.5vsGrok 4 Heavy
Mistral Medium 3.5 | Grok 4 Heavy | |
|---|---|---|
| Specifications | ||
ParametersA rough measure of how big the model is. More parameters usually means more capable and more expensive to run, though it is a poor guide on its own — a smaller, newer model often beats a larger, older one. | 128B | — |
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view. | 256k | — |
| API pricingUSD per 1M tokens · lower wins | ||
Input priceWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it. | $1.50 | — |
Output priceWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one. | $7.50 | — |
| BenchmarksPublished by one model only | ||
SWE-Bench VerifiedCoding — Real 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% | — |
| Overview | ||
| Company | Mistral | SpaceXAI |
| Release date | Apr 29 2026 | Jul 9 2025 |
| Access | Open Weight | Proprietary |
Other comparisons
Frequently asked questions
Mistral Medium 3.5 and Grok 4 Heavy don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Only Mistral Medium 3.5 has a verified first-party API price: $1.50 per million input tokens and $7.50 per million output tokens. No pay-as-you-go API rate is tracked for Grok 4 Heavy. Grok 4 Heavy shipped 294 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 Heavy is proprietary.
Direct benchmark comparisons are unavailable — Mistral Medium 3.5 and Grok 4 Heavy don't publish scores on any of the same benchmarks.
Mistral Medium 3.5 was released by Mistral on Apr 29 2026.
Grok 4 Heavy was released by SpaceXAI on Jul 9 2025.
Only Mistral Medium 3.5 has a verified first-party API price: $1.50 per million input tokens and $7.50 per million output tokens. No pay-as-you-go API rate is tracked for Grok 4 Heavy. Rates are pay-as-you-go API prices verified on August 18, 2026.
Mistral Medium 3.5 is an open weight model released by Mistral. Grok 4 Heavy is a proprietary model released by SpaceXAI.