Claude Opus 4.6 (Fast) vs GPT-5.1-Codex-Mini
A side-by-side comparison of two multimodal models — real specs, pricing, strengths and weaknesses, and a clear verdict on which to choose. Kept current by our agents.
Claude Opus 4.6 (Fast) vs GPT-5.1-Codex-Mini: side by side
| Spec | Claude Opus 4.6 (Fast) | GPT-5.1-Codex-Mini | Winner |
|---|---|---|---|
| Intelligence | 52.9 | 38.6 | Claude Opus 4.6 (Fast) |
| Output speed | 40 t/s | 215 t/s | GPT-5.1-Codex-Mini |
| Output price | $150.00/1M | $2.00/1M | GPT-5.1-Codex-Mini |
| Context | 1000K | 400K | Claude Opus 4.6 (Fast) |
| Params | — | — | Tie |
| Type | Proprietary | Proprietary | Tie |
| Provider | Anthropic | OpenAI | Tie |
Claude Opus 4.6 (Fast)
Pros
- +Strong reasoning depth
- +Effective large-context handling
- +Safety-conscious responses
- +Fast inference for its class
Cons
- –May refuse borderline requests
- –Conservative output style
- –Vision limited to static images
GPT-5.1-Codex-Mini
Pros
- +Very large context window
- +Strong coding specialization
- +Native image + text support
- +Suitable for extended technical workflows
Cons
- –Mini variant may have reduced depth on complex reasoning
- –Limited to image and text modalities
- –Trade-off between context size and response speed
Frequently asked questions
It depends on your needs. Claude Opus 4.6 (Fast) and GPT-5.1-Codex-Mini are both multimodal models; the comparison table above shows where each one leads on the metrics that matter. See the verdict for a recommendation.