Gemini 3 Flash Preview 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 Gemini 3 Flash Preview if you need
- ✓Choose Gemini 3 Flash Preview if you need fast inference at 168.18 tokens per second for preview or real-time multimodal tasks.
- ✓Choose Gemini 3 Flash Preview if you need native support for audio, video, text, image and files at a low cost of $3 per million tokens.
- ✓Choose Gemini 3 Flash Preview if you need efficient handling of very large contexts with broad modality coverage.
- ✓Choose Gemini 3 Flash Preview if you need cost-effective multimodal workflows without requiring maximum reasoning depth.
Choose GPT-5.5 if you need
- ✓Choose GPT-5.5 if you need the highest intelligence_index of 41.7 for advanced document-heavy reasoning.
- ✓Choose GPT-5.5 if you need flexible multimodal workflows focused on massive file and image inputs.
- ✓Choose GPT-5.5 if you need a slightly larger context window of 1,050,000 tokens for extensive text and image processing.
- ✓Choose GPT-5.5 if you need strong performance on document tasks despite higher latency and cost.
Verdict
GPT-5.5 leads with a higher intelligence_index of 41.7 versus Gemini 3 Flash Preview's 37.8, suiting it for complex reasoning tasks. Gemini 3 Flash Preview dominates on speed at 168.18 t/s and price at $3 per million tokens against GPT-5.5's 53.05 t/s and $30, while also offering native audio and video support that GPT-5.5 lacks. Context windows are nearly identical, with GPT-5.5's 1,050,000 edges out Gemini's 1,048,576 slightly.
Gemini 3 Flash Preview vs GPT-5.5: side by side
| Spec | Gemini 3 Flash Preview | GPT-5.5 | Winner |
|---|---|---|---|
| Intelligence | 37.8 | 41.7 | GPT-5.5 |
| Output speed | 168 t/s | 53 t/s | Gemini 3 Flash Preview |
| Output price | $3.00/1M | $30.00/1M | Gemini 3 Flash Preview |
| Context | 1049K | 1050K | GPT-5.5 |
| Params | — | — | Tie |
| Provider | OpenAI | Tie |
Detailed analysis
Intelligence
Winner: GPT-5.5GPT-5.5 scores 41.7 on the intelligence_index compared to Gemini 3 Flash Preview's 37.8. This gives GPT-5.5 an edge in tasks requiring deeper reasoning. Gemini's preview status notes potentially shallower reasoning depth as a limitation.
Speed and Pricing
Winner: Gemini 3 Flash PreviewGemini 3 Flash Preview delivers 168.18 tokens per second at $3 per million tokens. GPT-5.5 runs at 53.05 tokens per second and costs $30 per million tokens. The speed and price advantages make Gemini preferable for high-volume or latency-sensitive use.
Multimodal Support
Winner: Gemini 3 Flash PreviewGemini 3 Flash Preview provides native support for text, image, audio, video and files. GPT-5.5 supports files and images but has no native audio or video support. This gives Gemini broader out-of-the-box modality coverage.
Context Window
Winner: TieGPT-5.5 offers a context of 1,050,000 tokens while Gemini 3 Flash Preview has 1,048,576. Both handle very large contexts efficiently according to their strengths. The minor difference is unlikely to matter for most multimodal workloads.
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
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: Gemini 3 Flash Preview vs GPT-5.5
Select Gemini 3 Flash Preview for speed, lower cost, and full audio-video multimodal needs. Choose GPT-5.5 when maximum intelligence and document-focused image-file workflows are the priority. The models trade off performance metrics directly against each other in this category.
Frequently asked questions
It depends on priorities: GPT-5.5 for higher intelligence and document tasks, Gemini 3 Flash Preview for speed, cost, and audio-video support.