Claude Sonnet 4.5 vs Gemini 3.5 Flash
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 Sonnet 4.5 vs Gemini 3.5 Flash: side by side
| Spec | Claude Sonnet 4.5 | Gemini 3.5 Flash | Winner |
|---|---|---|---|
| Intelligence | — | 45.4 | Tie |
| Output speed | — | 150 t/s | Tie |
| Output price | $15.00/1M | $9.00/1M | Gemini 3.5 Flash |
| Context | 1000K | 1049K | Gemini 3.5 Flash |
| Params | — | — | Tie |
| Provider | Anthropic | Tie |
Claude Sonnet 4.5
Pros
- +Strong safety alignment
- +Reliable handling of large contexts
- +Careful and detailed reasoning
Cons
- –Can be overly cautious with refusals
- –Vision performance varies by image complexity
- –May produce verbose responses
Gemini 3.5 Flash
Pros
- +High speed and efficiency
- +Strong multimodal integration
- +Large context window support
Cons
- –Trades depth for speed on complex tasks
- –Variable performance on specialized domains
- –Context utilization depends on task
Frequently asked questions
It depends on your needs. Claude Sonnet 4.5 and Gemini 3.5 Flash are both multimodal models; the comparison table above shows where each one leads on the metrics that matter. See the verdict for a recommendation.