Gemini 3.1 Pro Preview vs GPT-5.6 Luna
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 3.1 Pro Preview comes from Google and GPT-5.6 Luna from OpenAI. The practical difference for most people is context, price, and which input types each one accepts.
GPT-5.6 Luna holds more in a single conversation — 1.1M tokens against 1.0M — which matters for long documents and large codebases.
GPT-5.6 Luna is the cheaper of the two on input tokens at $0.20 / 1M tokens.
| Specification | Gemini 3.1 Pro Preview | GPT-5.6 Luna |
|---|---|---|
| Provider | OpenAI | |
| Model ID | gemini-3.1-pro-preview | gpt-5.6-luna |
| Context window | 1.0M | 1.1M |
| Max output | 66K | 128K |
| Input price | $2.00 / 1M tokens | $0.20 / 1M tokens |
| Output price | $12.00 / 1M tokens | $0.02 / 1M tokens |
| Knowledge cutoff | 2025-01 | — |
| Input types | text, image, audio, video, file | text, image, file, audio |
| Output types | text | text |
| Plan | Premium | Free |
Which should you use?
Pick Gemini 3.1 Pro Preview when…
- You need video input, which the other model does not accept.
Pick GPT-5.6 Luna when…
- You need the larger context window — 1.1M against 1.0M.
- Cost matters: input runs at $0.20 / 1M tokens versus $2.00 / 1M tokens.
- You want longer single responses — up to 128K output tokens.
- You are on the free plan — this model is included without an upgrade.
Related comparisons
Try both on Clade
You do not have to choose. One Clade subscription gives you Gemini 3.1 Pro Preview, GPT-5.6 Luna, and every other model on the platform.