Gemini 3 Flash Preview vs Grok 4.20
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 Grok 4.20: side by side
| Spec | Gemini 3 Flash Preview | Grok 4.20 | Winner |
|---|---|---|---|
| Intelligence | 46.4 | 49.3 | Grok 4.20 |
| Output speed | 185 t/s | 161 t/s | Gemini 3 Flash Preview |
| Output price | $3.00/1M | $2.50/1M | Grok 4.20 |
| Context | 1049K | 2000K | Grok 4.20 |
| Params | — | — | Tie |
| Type | Proprietary | Proprietary | Tie |
| Provider | xAI | 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
Grok 4.20
Pros
- +Handles extremely large contexts up to 2M tokens
- +Native support for text, image, and file inputs
- +Multimodal integration in a single model
Cons
- –No audio or video modality support
- –Very large context can increase latency
- –Performance depends on input quality and structure
Frequently asked questions
It depends on your needs. Gemini 3 Flash Preview and Grok 4.20 are both multimodal models; the comparison table above shows where each one leads on the metrics that matter. See the verdict for a recommendation.