Claude Sonnet 4.5 vs Gemini 3.1 Pro Preview
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.
Claude Sonnet 4.5 comes from Anthropic and Gemini 3.1 Pro Preview from Google. The practical difference for most people is context, price, and which input types each one accepts.
Gemini 3.1 Pro Preview holds more in a single conversation — 1.0M tokens against 1M — which matters for long documents and large codebases.
Gemini 3.1 Pro Preview is the cheaper of the two on input tokens at $2.00 / 1M tokens.
| Specification | Claude Sonnet 4.5 | Gemini 3.1 Pro Preview |
|---|---|---|
| Provider | Anthropic | |
| Model ID | claude-sonnet-4-5-20250929 | gemini-3.1-pro-preview |
| Context window | 1M | 1.0M |
| Max output | 64K | 66K |
| Input price | $3.00 / 1M tokens | $2.00 / 1M tokens |
| Output price | $15.00 / 1M tokens | $12.00 / 1M tokens |
| Knowledge cutoff | 2025-01 | 2025-01 |
| Input types | text, image, file | text, image, audio, video, file |
| Output types | text | text |
| Plan | Premium | Premium |
Which should you use?
Pick Claude Sonnet 4.5 when…
- You prefer Anthropic's tone and formatting for your work.
Pick Gemini 3.1 Pro Preview when…
- You need the larger context window — 1.0M against 1M.
- Cost matters: input runs at $2.00 / 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 Claude Sonnet 4.5, Gemini 3.1 Pro Preview, and every other model on the platform.