Mistral Devstral 2 (123B) vs OpenAI GPT-5.3-Instant — side-by-side specs.
Mistral Devstral 2 (123B) | OpenAI GPT-5.3-Instant | |
|---|---|---|
| Overview | ||
| Company | Mistral | OpenAI |
| Release date | Dec 9 2025 | Mar 3 2026 |
| Model type | — | — |
| Open source | Yes | No |
| Specifications | ||
Parameters | — | — |
Context window | — | — |
| Benchmarks | ||
| Timeline | ||
| Release gap | Devstral 2 (123B) shipped 84 days before GPT-5.3-Instant | |
Devstral 2 (123B) and GPT-5.3-Instant don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Devstral 2 (123B) shipped 84 days before GPT-5.3-Instant, so benchmark comparisons should account for the intervening progress.
Devstral 2 (123B) is an open-source / open-weight model; GPT-5.3-Instant is proprietary.
Direct benchmark comparisons are unavailable — Devstral 2 (123B) and GPT-5.3-Instant don't publish scores on any of the same benchmarks.