Gemini 3 Flash Preview vs GPT-5.3-Codex
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.
Gemini 3 Flash Preview vs GPT-5.3-Codex: side by side
| Spec | Gemini 3 Flash Preview | GPT-5.3-Codex | Winner |
|---|---|---|---|
| Intelligence | 46.4 | 53.6 | GPT-5.3-Codex |
| Output speed | 188 t/s | 101 t/s | Gemini 3 Flash Preview |
| Output price | $3.00/1M | $14.00/1M | Gemini 3 Flash Preview |
| Context | 1049K | 400K | Gemini 3 Flash Preview |
| Params | — | — | Tie |
| Type | Proprietary | Proprietary | Tie |
| Provider | OpenAI | Tie |
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-5.3-Codex
Pros
- +Specialized for programming workflows
- +Extensive context handling
- +Support for diverse input types
Cons
- –Narrower focus than general-purpose models
- –Performance tied to input quality
Frequently asked questions
It depends on your needs. Gemini 3 Flash Preview and GPT-5.3-Codex are both multimodal models; the comparison table above shows where each one leads on the metrics that matter. See the verdict for a recommendation.