AI Model Release Tracker - Timeline of Major AI Models from 2022-2026

Mistral Small 3.1 vs Grok 4 Heavy

Mistral
Mistral Small 3.1
SpaceXAI
Grok 4 Heavy
Overview
CompanyMistralSpaceXAI
Release dateMar 17 2025Jul 9 2025
AccessOpen WeightProprietary
Timeline
Release gapMistral Small 3.1 shipped 114 days before Grok 4 Heavy

Which is better: Mistral Small 3.1 or Grok 4 Heavy?

Mistral Small 3.1 and Grok 4 Heavy don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Mistral Small 3.1 shipped 114 days before Grok 4 Heavy, so benchmark comparisons should account for the intervening progress.

Mistral Small 3.1 is open weight, while Grok 4 Heavy is proprietary.

Direct benchmark comparisons are unavailable — Mistral Small 3.1 and Grok 4 Heavy don't publish scores on any of the same benchmarks.

Frequently asked questions

Mistral Small 3.1 was released by Mistral on Mar 17 2025.

Grok 4 Heavy was released by SpaceXAI on Jul 9 2025.

Mistral Small 3.1 is an open weight model released by Mistral. Grok 4 Heavy is a proprietary model released by SpaceXAI.

Other comparisons