Grok 4 Fast vs Claude Opus 4.1
Grok 4 Fast is cheaper on output tokens, while Grok 4 Fast offers a larger context window. Choose Grok 4 Fast or Claude Opus 4.1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Grok 4 Fast | Claude Opus 4.1 |
|---|---|---|
| Provider | ZenMux | ZenMux |
| Input / 1M tokens | $0.20 | $15.00 |
| Output / 1M tokens | $0.50 | $75.00 |
| Context window | 2M | 200K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Sep 2025 | Aug 2025 |
FAQ
Is Grok 4 Fast or Claude Opus 4.1 cheaper?
Grok 4 Fast is cheaper on output tokens ($0.50 vs $75.00 per 1M).
Which has the larger context window, Grok 4 Fast or Claude Opus 4.1?
Grok 4 Fast has the larger context window (2M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.