Claude Opus 4.8 (Fast) vs Gemini 3 Flash Preview
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.
Claude Opus 4.8 (Fast) vs Gemini 3 Flash Preview: side by side
| Spec | Claude Opus 4.8 (Fast) | Gemini 3 Flash Preview | Winner |
|---|---|---|---|
| Intelligence | 61.4 | 46.4 | Claude Opus 4.8 (Fast) |
| Output speed | 60 t/s | 185 t/s | Gemini 3 Flash Preview |
| Output price | $50.00/1M | $3.00/1M | Gemini 3 Flash Preview |
| Context | 1000K | 1049K | Gemini 3 Flash Preview |
| Params | — | — | Tie |
| Type | Proprietary | Proprietary | Tie |
| Provider | Anthropic | Tie |
Claude Opus 4.8 (Fast)
Pros
- +Strong safety alignment
- +Nuanced and careful reasoning
- +Effective large-context handling
- +High-quality writing and analysis
Cons
- –Can be overly cautious on edge cases
- –Multimodal performance varies with image clarity
- –Fast mode may trade some depth for speed
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
Frequently asked questions
It depends on your needs. Claude Opus 4.8 (Fast) and Gemini 3 Flash Preview are both multimodal models; the comparison table above shows where each one leads on the metrics that matter. See the verdict for a recommendation.