Grok 4.1 Fast (Non-Reasoning) vs Claude Sonnet 4.5
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 Claude Sonnet 4.5 from Anthropic. 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 1M — which matters for long documents and large codebases.
Grok 4.1 Fast (Non-Reasoning) is the cheaper of the two on input tokens at $0.20 / 1M tokens.
| Specification | Grok 4.1 Fast (Non-Reasoning) | Claude Sonnet 4.5 |
|---|---|---|
| Provider | xAI | Anthropic |
| Model ID | grok-4-1-fast-non-reasoning | claude-sonnet-4-5-20250929 |
| Context window | 2M | 1M |
| Max output | — | 64K |
| Input price | $0.20 / 1M tokens | $3.00 / 1M tokens |
| Output price | $0.50 / 1M tokens | $15.00 / 1M tokens |
| Knowledge cutoff | — | 2025-01 |
| Input types | text, image, file, audio | text, image, file |
| Output types | text | text |
| Plan | Free | Premium |
Which should you use?
Pick Grok 4.1 Fast (Non-Reasoning) when…
- You need the larger context window — 2M against 1M.
- Cost matters: input runs at $0.20 / 1M tokens versus $3.00 / 1M tokens.
- You need audio input, which the other model does not accept.
- You are on the free plan — this model is included without an upgrade.
Pick Claude Sonnet 4.5 when…
- You want longer single responses — up to 64K 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), Claude Sonnet 4.5, and every other model on the platform.