Gemini 3 Flash Preview 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 Gemini 3 Flash Preview if you need
- ✓Strong reasoning over extended text, image, and file inputs
- ✓Slightly larger 1,050,000-token context window
- ✓Seamless multimodal integration for files, images, and text
- ✓Proprietary OpenAI model with native file/image/text handling
Choose GPT-5.5 Pro if you need
- ✓Fast 179.3 t/s output speed at only $3 per million tokens
- ✓Native support for text, image, audio, video, and files
- ✓Efficient handling of very large contexts in preview use
- ✓Broad multimodal coverage including audio and video
Verdict
Gemini 3 Flash Preview leads on price, speed, and native audio/video support while matching GPT-5.5 Pro's near-identical million-token context. GPT-5.5 Pro holds an edge in strong reasoning over extended text/image/file inputs but at 60x higher cost and without audio or video. The choice hinges on whether broad multimodal coverage and efficiency outweigh deeper reasoning needs.
Gemini 3 Flash Preview vs GPT-5.5 Pro: side by side
| Spec | Gemini 3 Flash Preview | GPT-5.5 Pro | Winner |
|---|---|---|---|
| Intelligence | 37.8 | — | Tie |
| Output speed | 179 t/s | — | Tie |
| Output price | $3.00/1M | $180.00/1M | Gemini 3 Flash Preview |
| Context | 1049K | 1050K | GPT-5.5 Pro |
| Params | — | — | Tie |
| Provider | OpenAI | Tie |
Detailed analysis
Pricing
Winner: Gemini 3 Flash PreviewGemini 3 Flash Preview costs $3 per million output tokens versus GPT-5.5 Pro at $180 per million. The 60x price difference makes Gemini far more accessible for high-volume use. Both are proprietary models from major providers.
Modalities
Winner: Gemini 3 Flash PreviewGemini 3 Flash Preview natively supports text, image, audio, video, and files. GPT-5.5 Pro supports files, images, and text but lacks audio or video modalities. This gives Gemini broader native coverage.
Speed and Context
Winner: Gemini 3 Flash PreviewGemini 3 Flash Preview reports 179.3 tokens per second output speed while GPT-5.5 Pro speed is unspecified. Both offer essentially identical context windows (1,050,000 vs 1,048,576 tokens). GPT-5.5 Pro notes potential latency on very long inputs.
Reasoning
Winner: GPT-5.5 ProGPT-5.5 Pro lists strong reasoning over extended inputs as a strength. Gemini 3 Flash Preview notes reasoning depth can be shallower than full-scale models. Intelligence index is provided only for Gemini at 37.8.
Gemini 3 Flash Preview
Pros
- +Broad native support for text, image, audio, video and files
- +Efficient handling of very large contexts
- +Fast inference suitable for preview use
Cons
- –Preview status may include occasional instability
- –Reasoning depth can be shallower than full-scale models
- –No native tool-use or external browsing mentioned
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: Gemini 3 Flash Preview vs GPT-5.5 Pro
Choose Gemini 3 Flash Preview for fast, low-cost multimodal work that includes audio and video. Choose GPT-5.5 Pro when maximum reasoning depth on text/image/file inputs is the priority despite the steep price. Context windows are effectively equal.
Frequently asked questions
Gemini 3 Flash Preview is better for most users due to speed, price, and wider modality support; GPT-5.5 Pro is better only when strong reasoning on text/image/file inputs outweighs cost.