Claude 3.5 Sonnet (upgraded) vs Devstral 2 (123B)
Anthropic Claude 3.5 Sonnet (upgraded) | Mistral Devstral 2 (123B) | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Mistral |
| Release date | Oct 22 2024 | Dec 9 2025 |
| Access | Proprietary | Open Weight |
| Benchmarks | ||
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. | 49% | — |
| Timeline | ||
| Release gap | Claude 3.5 Sonnet (upgraded) shipped 413 days before Devstral 2 (123B) | |
Which is better: Claude 3.5 Sonnet (upgraded) or Devstral 2 (123B)?
Claude 3.5 Sonnet (upgraded) and Devstral 2 (123B) don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 3.5 Sonnet (upgraded) shipped 413 days before Devstral 2 (123B), so benchmark comparisons should account for the intervening progress.
Claude 3.5 Sonnet (upgraded) is proprietary, while Devstral 2 (123B) is open weight.
Direct benchmark comparisons are unavailable — Claude 3.5 Sonnet (upgraded) and Devstral 2 (123B) don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude 3.5 Sonnet (upgraded) was released by Anthropic on Oct 22 2024.
Devstral 2 (123B) was released by Mistral on Dec 9 2025.
Claude 3.5 Sonnet (upgraded) is a proprietary model released by Anthropic. Devstral 2 (123B) is an open weight model released by Mistral.