Grok 4.3 vs Grok 4.1 Fast
A direct API-pricing comparison between Grok 4.3 and Grok 4.1 Fast. Below: every cost dimension side by side, then the bottom line for a typical workload.
Bottom line
For a typical 5K-in / 1K-out request, Grok 4.1 Fast is the cheaper choice at $0.0015 per call — 5.8× less than Grok 4.3 at $0.0088.
| Grok 4.3xAI | Grok 4.1 FastxAI | |
|---|---|---|
| Input / 1M tokens | $1.25 | $0.200 |
| Output / 1M tokens | $2.50 | $0.500 |
| Cached input / 1M | — | — |
| Context window | 256K | 256K |
| Provider | xAI | xAI |
Green = cheaper on that line. Prices are estimates from public pricing pages; verify against xAI and xAI before relying on them.
Which is cheaper, Grok 4.3 or Grok 4.1 Fast?
On output tokens — usually the dominant cost — Grok 4.3 charges $2.50 per million versus $0.500 for Grok 4.1 Fast. The right pick depends on your input/output ratio and how much you can serve from cache. Use the calculator to model your exact traffic.