Gemini 3.8 Flash vs Sonar Pro
Side-by-side specs, pricing and capabilities. Both models run on Clade under one subscription, so you can switch between them in the same conversation.
Gemini 3.8 Flash comes from Google and Sonar Pro from Perplexity. The practical difference for most people is context, price, and which input types each one accepts.
Gemini 3.8 Flash holds more in a single conversation — 1.0M tokens against 128K — which matters for long documents and large codebases.
Gemini 3.8 Flash is the cheaper of the two on input tokens at $0.75 / 1M tokens.
| Specification | Gemini 3.8 Flash | Sonar Pro |
|---|---|---|
| Provider | Perplexity | |
| Model ID | gemini-3.8-flash | sonar-pro |
| Context window | 1.0M | 128K |
| Max output | 66K | — |
| Input price | $0.75 / 1M tokens | $3.00 / 1M tokens |
| Output price | $3.75 / 1M tokens | $15.00 / 1M tokens |
| Knowledge cutoff | — | — |
| Input types | text, image, file, audio, video | text, image, file |
| Output types | text | text |
| Plan | All paid plans | All paid plans |
Which should you use?
Pick Gemini 3.8 Flash when…
- You need the larger context window — 1.0M against 128K.
- Cost matters: input runs at $0.75 / 1M tokens versus $3.00 / 1M tokens.
- You want longer single responses — up to 66K output tokens.
- You need audio and video input, which the other model does not accept.
Related comparisons
Try both on Clade
You do not have to choose. One Clade subscription gives you Gemini 3.8 Flash, Sonar Pro, and every other model on the platform.