GPT-5.4 Pro vs GPT-5.5
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 Pro if you need
- ✓Need advanced reasoning and strong text-image-file integration over very large inputs
- ✓Require versatile handling of document and visual tasks with extended context
- ✓Can accept higher latency and $180/1M output pricing for those capabilities
Choose GPT-5.5 if you need
- ✓Require lower output cost at $30/1M tokens
- ✓Need documented output speed of 51.77 t/s alongside 1,050,000 context
- ✓Want flexible multimodal workflows for massive file and image inputs
- ✓Prioritize suitability for document-heavy tasks at reduced price
Verdict
GPT-5.5 leads on cost and documented speed while sharing the same 1,050,000-token context and multimodal file/image focus as GPT-5.4 Pro. GPT-5.4 Pro is positioned for stronger integration and advanced reasoning over large inputs but carries a six-times-higher output price and unknown speed metrics. GPT-5.5 is the clearer choice for most document-heavy multimodal workloads unless maximum reasoning depth on extended contexts is required.
GPT-5.4 Pro vs GPT-5.5: side by side
| Spec | GPT-5.4 Pro | GPT-5.5 | Winner |
|---|---|---|---|
| Intelligence | — | 41.7 | Tie |
| Output speed | — | 54 t/s | Tie |
| Output price | $180.00/1M | $30.00/1M | GPT-5.5 |
| Context | 1050K | 1050K | Tie |
| Params | — | — | Tie |
| Provider | OpenAI | OpenAI | Tie |
Detailed analysis
Pricing
Winner: GPT-5.5GPT-5.5 lists output price at $30 per million tokens versus $180 for GPT-5.4 Pro. Both models are proprietary OpenAI offerings with identical context length. The six-fold price difference favors GPT-5.5 for cost-sensitive multimodal workloads.
Speed & Context
Winner: GPT-5.5GPT-5.5 provides a measured output speed of 51.77 tokens per second; GPT-5.4 Pro speed is unspecified. Both share the 1,050,000-token context window. GPT-5.5 therefore supplies concrete speed data while matching context size.
Multimodal Capabilities
Winner: TieBoth models support text, image, and file inputs with no native audio or video. GPT-5.4 Pro emphasizes strong integration and advanced reasoning over large inputs; GPT-5.5 highlights flexible workflows and native file/image support. Strengths overlap substantially on document and visual tasks.
Intelligence & Reasoning
Winner: GPT-5.4 ProGPT-5.4 Pro lists advanced reasoning over extended contexts as a core strength. GPT-5.5 supplies an intelligence_index of 41.7 while GPT-5.4 Pro leaves the metric unspecified. Available facts position GPT-5.4 Pro for deeper reasoning scenarios.
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
GPT-5.5
Pros
- +Extremely large context window
- +Native support for files and images
- +Flexible multimodal workflows
Cons
- –No native audio or video support
- –Large context may increase latency
- –Performance depends on input quality across modalities
Summary: GPT-5.4 Pro vs GPT-5.5
Choose GPT-5.5 for most multimodal file and image tasks given its lower price and known speed. Select GPT-5.4 Pro only when advanced reasoning and integration on maximum-length inputs justify the higher cost. Both models share the same context size and lack audio/video support.
Frequently asked questions
GPT-5.5 at $30 per million output tokens versus $180 for GPT-5.4 Pro.