GPT-5.4 Mini vs GPT-5.5 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-5.4 Mini if you need
- ✓Need 1.05M token context for extended multimodal reasoning
- ✓Require seamless integration across very long file and image inputs
- ✓Prioritize depth on complex extended-context tasks despite higher cost
Choose GPT-5.5 Pro if you need
- ✓Need 400K token context at $4.5 per million tokens
- ✓Require fast output at 185.12 tokens per second for document workflows
- ✓Want lower-cost multimodal processing of files, images, and text
Verdict
GPT-5.5 Pro leads on maximum context length (1.05M tokens) and strong reasoning over extended inputs while GPT-5.4 Mini leads on price ($4.5 vs $180 per million tokens) and documented output speed (185.12 t/s). Both share native file/image/text support from OpenAI with identical modality limits. GPT-5.5 Pro suits extreme-scale reasoning tasks; GPT-5.4 Mini suits cost-sensitive large-scale document processing.
GPT-5.4 Mini vs GPT-5.5 Pro: side by side
| Spec | GPT-5.4 Mini | GPT-5.5 Pro | Winner |
|---|---|---|---|
| Intelligence | 40 | — | Tie |
| Output speed | 185 t/s | — | Tie |
| Output price | $4.50/1M | $180.00/1M | GPT-5.4 Mini |
| Context | 400K | 1050K | GPT-5.5 Pro |
| Params | — | — | Tie |
| Provider | OpenAI | OpenAI | Tie |
Detailed analysis
Context Window
Winner: GPT-5.5 ProGPT-5.5 Pro provides 1,050,000 tokens versus GPT-5.4 Mini's 400,000 tokens. This gives Pro a clear advantage for handling over a million tokens of combined file, image, and text input. Both list very large context as a strength but Pro's scale is substantially larger.
Pricing
Winner: GPT-5.4 MiniGPT-5.4 Mini costs $4.5 per million tokens while GPT-5.5 Pro costs $180 per million tokens. The 40x price difference makes Mini the clear choice for budget-conscious large-scale processing. Both are proprietary OpenAI models with no other cost data provided.
Speed
Winner: GPT-5.4 MiniGPT-5.4 Mini lists an output speed of 185.12 tokens per second; no speed figure is given for GPT-5.5 Pro. Both note potential latency on long inputs as a limitation, but only Mini supplies a concrete speed metric.
Multimodal Capabilities
Winner: TieBoth models offer native support for files, images, and text with no audio or video modalities. GPT-5.5 Pro emphasizes seamless integration and strong reasoning over extended inputs while GPT-5.4 Mini highlights flexible workflows for document-heavy tasks.
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
GPT-5.5 Pro
Pros
- +Very large context window
- +Native support for files, images, and text
- +Seamless multimodal integration
Cons
- –High resource use with maximum context
- –No audio or video modalities
- –Potential latency on very long inputs
Summary: GPT-5.4 Mini vs GPT-5.5 Pro
Choose GPT-5.5 Pro when maximum context and extended-input reasoning outweigh cost. Choose GPT-5.4 Mini when speed, lower price, and 400K-token multimodal document work are priorities. Both remain proprietary OpenAI models with identical listed modality support.
Frequently asked questions
GPT-5.5 Pro is better for maximum-context reasoning tasks; GPT-5.4 Mini is better for cost and speed on large-scale file/image/text processing.