DeepSeek DeepSeek V2.5 (Revised) vs OpenAI GPT-5.1-Codex-Max — side-by-side specs.
DeepSeek DeepSeek V2.5 (Revised) | OpenAI GPT-5.1-Codex-Max | |
|---|---|---|
| Overview | ||
| Company | DeepSeek | OpenAI |
| Release date | Dec 2024 | Nov 19 2025 |
| Model type | — | — |
| Open source | Yes | No |
| Specifications | ||
Parameters | — | — |
Context window | — | — |
| Benchmarks | ||
| Timeline | ||
| Release gap | DeepSeek V2.5 (Revised) shipped 353 days before GPT-5.1-Codex-Max | |
DeepSeek V2.5 (Revised) and GPT-5.1-Codex-Max don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. DeepSeek V2.5 (Revised) shipped 353 days before GPT-5.1-Codex-Max, so benchmark comparisons should account for the intervening progress.
DeepSeek V2.5 (Revised) is an open-source / open-weight model; GPT-5.1-Codex-Max is proprietary.
Direct benchmark comparisons are unavailable — DeepSeek V2.5 (Revised) and GPT-5.1-Codex-Max don't publish scores on any of the same benchmarks.