Side-by-side analysis of Deepseek Deepseek V3 1 Terminus, Openai Gpt 5 1 Codex Mini across performance, benchmarks, capabilities, and infrastructure requirements.
Source: inferbase.ai
Side-by-side analysis of Deepseek Deepseek V3 1 Terminus, Openai Gpt 5 1 Codex Mini across performance, benchmarks, capabilities, and infrastructure requirements.
DeepSeek-V3.1 Terminus is an update to [DeepSeek V3.1](/deepseek/deepseek-chat-v3.1) that maintains the model's original capabilities while addressing issues reported by users, including language consistency and agent capabilities, further optimizing the model's performance in coding and search agents. It is a large hybrid reasoning model (671B parameters, 37B active) that supports both thinking and non-thinking modes.
GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex.
| Specification | DeepSeek V3.1 Terminus | GPT-5.1-CODEX Mini |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Parameters | 671B | — |
| Context window | 164K | 400K |
| Max output | — | 100K |
| Input modalities | text | image, text |
| Output modalities | text | text |
| License | mit | proprietary |
| Model type | chat | chat |
| Capability | DeepSeek V3.1 Terminus | GPT-5.1-CODEX Mini |
|---|---|---|
| code_completion | — | Yes |
| code_generation | Yes | Yes |
| code_review | — | Yes |
| function_calling | Yes | Yes |
| json_mode | Yes | Yes |
| reasoning | Yes | Yes |
| streaming | Yes | Yes |
| text_generation | Yes | — |
| tool_use | — |
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| vision | — | Yes |