GPT-5.1-Codex-Mini vs GPT-5.4 Pro
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-5.1-Codex-Mini if you need strong coding specialization with native image and text support.
- ✓Choose GPT-5.1-Codex-Mini if you need a 400k context window at only $2 per million tokens.
- ✓Choose GPT-5.1-Codex-Mini if you need fast output at 215 tokens per second for technical workflows.
- ✓Choose GPT-5.1-Codex-Mini if you need extended coding sessions without high latency costs.
Choose GPT-5.4 Pro if you need
- ✓Choose GPT-5.4 Pro if you need 1.05M context for very large text, image, and file inputs.
- ✓Choose GPT-5.4 Pro if you need strong integration of text, image, and file data in one model.
- ✓Choose GPT-5.4 Pro if you need advanced reasoning over extended multimodal documents.
- ✓Choose GPT-5.4 Pro if you need versatile handling of large-scale visual and document tasks.
Verdict
GPT-5.1-Codex-Mini leads for cost-sensitive coding workflows with its known 215 t/s speed, $2/M price, and 400k context plus image+text support, while GPT-5.4 Pro leads on raw scale with 1.05M context and file integration for large multimodal inputs. GPT-5.4 Pro's $180/M price creates a steep trade-off against the Mini's specialization. Neither has complete intelligence or speed data for direct comparison on reasoning depth.
GPT-5.1-Codex-Mini vs GPT-5.4 Pro: side by side
| Spec | GPT-5.1-Codex-Mini | GPT-5.4 Pro | Winner |
|---|---|---|---|
| Intelligence | 30.6 | — | Tie |
| Output speed | 216 t/s | — | Tie |
| Output price | $2.00/1M | $180.00/1M | GPT-5.1-Codex-Mini |
| Context | 400K | 1050K | GPT-5.4 Pro |
| Params | — | — | Tie |
| Provider | OpenAI | OpenAI | Tie |
Detailed analysis
Context Window
Winner: GPT-5.4 ProGPT-5.4 Pro provides a 1.05M token context versus GPT-5.1-Codex-Mini's 400k. This gives the Pro model an edge for processing very large inputs across modalities. The Mini still offers a substantial window suited to extended technical sessions.
Pricing
Winner: GPT-5.1-Codex-MiniGPT-5.1-Codex-Mini costs $2 per million output tokens while GPT-5.4 Pro costs $180 per million. The 90x price gap favors the Mini for high-volume or budget-conscious use. Both are proprietary OpenAI models with usage constraints.
Speed & Modalities
Winner: GPT-5.1-Codex-MiniGPT-5.1-Codex-Mini reports 215 tokens per second output speed and native image+text support with coding focus. GPT-5.4 Pro lacks published speed data but supports text, image, and file tasks. The Mini's known speed and specialization suit fast technical workflows.
Task Specialization
Winner: TieGPT-5.1-Codex-Mini is explicitly positioned as a multimodal coding model while GPT-5.4 Pro excels at large-scale text, image, and file tasks. Each targets different primary use cases without overlapping metrics on intelligence.
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 Pro
Pros
- +Handles very large inputs across modalities
- +Strong integration of text, image, and file data
- +Advanced reasoning over extended contexts
Cons
- –Higher latency on maximum-length inputs
- –No native audio or video support
- –Proprietary access with usage constraints
Summary: GPT-5.1-Codex-Mini vs GPT-5.4 Pro
Select GPT-5.1-Codex-Mini for affordable, fast coding with image+text and 400k context. Select GPT-5.4 Pro when maximum context and file integration outweigh the much higher cost. The data show clear specialization splits rather than one universal leader.
Frequently asked questions
GPT-5.1-Codex-Mini is better for coding speed and cost; GPT-5.4 Pro is better for maximum context and file handling.