GPT-6 Astra vs Gemini 3.8 Flash
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.
GPT-6 Astra comes from OpenAI and Gemini 3.8 Flash from Google. The practical difference for most people is context, price, and which input types each one accepts.
GPT-6 Astra holds more in a single conversation — 1.1M tokens against 1.0M — 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 | GPT-6 Astra | Gemini 3.8 Flash |
|---|---|---|
| Provider | OpenAI | |
| Model ID | gpt-6-astra | gemini-3.8-flash |
| Context window | 1.1M | 1.0M |
| Max output | 128K | 66K |
| Input price | $10.00 / 1M tokens | $0.75 / 1M tokens |
| Output price | $50.00 / 1M tokens | $3.75 / 1M tokens |
| Knowledge cutoff | 2026-04 | — |
| Input types | text, image | text, image, file, audio, video |
| Output types | text | text |
| Plan | All paid plans | All paid plans |
Which should you use?
Pick GPT-6 Astra when…
- You need the larger context window — 1.1M against 1.0M.
- You want longer single responses — up to 128K output tokens.
Pick Gemini 3.8 Flash when…
- Cost matters: input runs at $0.75 / 1M tokens versus $10.00 / 1M tokens.
- You need file and 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 GPT-6 Astra, Gemini 3.8 Flash, and every other model on the platform.