GPT-5.4 Nano 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 Nano if you need
- ✓handling over a million tokens of context with strong reasoning over extended inputs
- ✓seamless multimodal integration of files, images, and text
- ✓maximum context window size among the two options
Choose GPT-5.5 Pro if you need
- ✓high output speed at 147.78 t/s and very low cost of $1.25 per million tokens
- ✓400k-token context sufficient for large file and image tasks
- ✓compact model size when depth on complex tasks is not critical
Verdict
GPT-5.5 Pro leads for maximum-scale multimodal reasoning thanks to its 1.05M-token context and emphasis on strong extended-input performance, while GPT-5.4 Nano dominates on measurable efficiency with 147.78 t/s speed and $1.25/1M pricing for 400k-context tasks. The Pro model trades higher cost and potential latency for greater context capacity; the Nano model accepts smaller size limits in exchange for practicality.
GPT-5.4 Nano vs GPT-5.5 Pro: side by side
| Spec | GPT-5.4 Nano | GPT-5.5 Pro | Winner |
|---|---|---|---|
| Intelligence | 38.2 | — | Tie |
| Output speed | 151 t/s | — | Tie |
| Output price | $1.25/1M | $180.00/1M | GPT-5.4 Nano |
| 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 a 1,050,000-token context versus GPT-5.4 Nano's 400,000 tokens. This gives Pro a clear advantage for the longest multimodal inputs while both support files, images, and text.
Pricing
Winner: GPT-5.4 NanoGPT-5.4 Nano is priced at $1.25 per million output tokens. GPT-5.5 Pro costs $180 per million output tokens, making Nano dramatically more affordable for high-volume use.
Speed
Winner: GPT-5.4 NanoGPT-5.4 Nano reports 147.78 tokens per second. GPT-5.5 Pro lists no speed figure but notes potential latency on very long inputs, favoring Nano for throughput.
Multimodal Reasoning
Winner: GPT-5.5 ProGPT-5.5 Pro highlights strong reasoning over extended inputs and seamless integration. GPT-5.4 Nano notes possible limits from its nano size on complex tasks, though both lack audio or video support.
GPT-5.4 Nano
Pros
- +Very large 400k token context
- +Handles file, image, and text inputs
- +Multimodal flexibility
Cons
- –Nano size may limit depth on complex tasks
- –No audio or video modalities
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 Nano vs GPT-5.5 Pro
Select GPT-5.5 Pro when the workload requires the full 1M+ token context and deepest reasoning on long multimodal documents. Choose GPT-5.4 Nano for cost-sensitive or speed-sensitive applications that fit within a 400k-token window.
Frequently asked questions
It depends on needs: GPT-5.5 Pro for maximum context and reasoning depth, GPT-5.4 Nano for speed and cost efficiency within 400k tokens.