GPT-6 Astra vs Grok 4.3
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 Grok 4.3 from xAI. 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 1M — which matters for long documents and large codebases.
Grok 4.3 is the cheaper of the two on input tokens at $1.25 / 1M tokens.
| Specification | GPT-6 Astra | Grok 4.3 |
|---|---|---|
| Provider | OpenAI | xAI |
| Model ID | gpt-6-astra | grok-4.3 |
| Context window | 1.1M | 1M |
| Max output | 128K | — |
| Input price | $10.00 / 1M tokens | $1.25 / 1M tokens |
| Output price | $50.00 / 1M tokens | $2.50 / 1M tokens |
| Knowledge cutoff | 2026-04 | — |
| Input types | text, image | text, image |
| 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 1M.
- You want longer single responses — up to 128K output tokens.
Pick Grok 4.3 when…
- Cost matters: input runs at $1.25 / 1M tokens versus $10.00 / 1M tokens.
Related comparisons
Try both on Clade
You do not have to choose. One Clade subscription gives you GPT-6 Astra, Grok 4.3, and every other model on the platform.