GPT-5.1-Codex-Mini vs GPT-5.4 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.
Quick verdict: which should you choose?
Choose GPT-5.1-Codex-Mini if you need
- ✓Choose GPT-5.4 Mini if you need native support for files, images, and text in flexible multimodal workflows.
- ✓Choose GPT-5.4 Mini if you need higher intelligence_index of 40 for document-heavy tasks.
- ✓Choose GPT-5.4 Mini if you need very large context with broad input quality handling across modalities.
Choose GPT-5.4 Mini if you need
- ✓Choose GPT-5.1-Codex-Mini if you need lower output_price of $2 per 1M tokens.
- ✓Choose GPT-5.1-Codex-Mini if you need faster output_speed of 215.76 t/s for extended technical workflows.
- ✓Choose GPT-5.1-Codex-Mini if you need strong coding specialization with image and text support.
Verdict
GPT-5.4 Mini leads in intelligence (40 vs 30.6) and multimodal flexibility with native file, image, and text support, making it stronger for document-heavy workflows. GPT-5.1-Codex-Mini wins on speed (215.76 t/s vs 183.33 t/s) and price ($2 vs $4.5 per 1M tokens) while offering coding specialization. Both share identical 400k context and proprietary OpenAI origins, but trade-offs in depth and modality breadth favor different use cases.
GPT-5.1-Codex-Mini vs GPT-5.4 Mini: side by side
| Spec | GPT-5.1-Codex-Mini | GPT-5.4 Mini | Winner |
|---|---|---|---|
| Intelligence | 30.6 | 40 | GPT-5.4 Mini |
| Output speed | 216 t/s | 183 t/s | GPT-5.1-Codex-Mini |
| Output price | $2.00/1M | $4.50/1M | GPT-5.1-Codex-Mini |
| Context | 400K | 400K | Tie |
| Params | — | — | Tie |
| Provider | OpenAI | OpenAI | Tie |
Detailed analysis
Intelligence
Winner: GPT-5.4 MiniGPT-5.4 Mini scores 40 on intelligence_index compared to 30.6 for GPT-5.1-Codex-Mini. This gives A an edge in overall capability despite both being mini variants that may reduce depth on complex reasoning.
Pricing
Winner: GPT-5.1-Codex-MiniGPT-5.1-Codex-Mini costs $2 per 1M tokens while GPT-5.4 Mini costs $4.5 per 1M tokens. The lower price makes B more economical for high-volume usage.
Speed
Winner: GPT-5.1-Codex-MiniGPT-5.1-Codex-Mini achieves 215.76 t/s output speed versus 183.33 t/s for GPT-5.4 Mini. Both note potential latency increases with long contexts, but B maintains the speed advantage.
Modalities
Winner: GPT-5.4 MiniGPT-5.4 Mini supports files, images, and text natively for flexible workflows, while GPT-5.1-Codex-Mini is limited to image and text with coding focus. This makes A better suited for document-heavy multimodal tasks.
GPT-5.1-Codex-Mini
Pros
- +Very large context window
- +Strong coding specialization
- +Native image + text support
Cons
- –Mini variant may have reduced depth on complex reasoning
- –Limited to image and text modalities
- –Trade-off between context size and response speed
GPT-5.4 Mini
Pros
- +Very large context window
- +Native support for files, images, and text
- +Flexible multimodal workflows
Cons
- –Mini size may reduce depth on complex reasoning
- –Performance depends on input quality across modalities
- –Long contexts can increase latency
Summary: GPT-5.1-Codex-Mini vs GPT-5.4 Mini
Select GPT-5.4 Mini for higher intelligence and full file-image-text support in document tasks. Choose GPT-5.1-Codex-Mini when speed, lower cost, and coding specialization matter most. Both deliver the same 400k context from OpenAI.
Frequently asked questions
GPT-5.4 Mini is better for intelligence and broad multimodal file support, while GPT-5.1-Codex-Mini is better for speed and price in coding tasks.