Grok 4.1 Fast (Non-Reasoning) 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.
Grok 4.1 Fast (Non-Reasoning) comes from xAI and GPT-5.6 Luna from OpenAI. The practical difference for most people is context, price, and which input types each one accepts.
Grok 4.1 Fast (Non-Reasoning) holds more in a single conversation — 2M tokens against 1.1M — which matters for long documents and large codebases.
| Specification | Grok 4.1 Fast (Non-Reasoning) | GPT-5.6 Luna |
|---|---|---|
| Provider | xAI | OpenAI |
| Model ID | grok-4-1-fast-non-reasoning | gpt-5.6-luna |
| Context window | 2M | 1.1M |
| Max output | — | 128K |
| Input price | $0.20 / 1M tokens | $0.20 / 1M tokens |
| Output price | $0.50 / 1M tokens | $0.02 / 1M tokens |
| Knowledge cutoff | — | — |
| Input types | text, image, file, audio | text, image, file, audio |
| Output types | text | text |
| Plan | Free | Free |
Which should you use?
Pick Grok 4.1 Fast (Non-Reasoning) when…
- You need the larger context window — 2M against 1.1M.
Pick GPT-5.6 Luna when…
- You want longer single responses — up to 128K output tokens.
Related comparisons
Try both on Clade
You do not have to choose. One Clade subscription gives you Grok 4.1 Fast (Non-Reasoning), GPT-5.6 Luna, and every other model on the platform.