Gemini 3.1 Pro vs Grok 4.3
A direct API-pricing comparison between Gemini 3.1 Pro and Grok 4.3. 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 4.3 is the cheaper choice at $0.0088 per call — 2.5× less than Gemini 3.1 Pro at $0.022.
| Gemini 3.1 ProGoogle | Grok 4.3xAI | |
|---|---|---|
| Input / 1M tokens | $2.00 | $1.25 |
| Output / 1M tokens | $12.00 | $2.50 |
| Cached input / 1M | — | — |
| Context window | 1M | 256K |
| Provider | xAI |
Green = cheaper on that line. Prices are estimates from public pricing pages; verify against Google and xAI before relying on them.
Which is cheaper, Gemini 3.1 Pro or Grok 4.3?
On output tokens — usually the dominant cost — Gemini 3.1 Pro charges $12.00 per million versus $2.50 for Grok 4.3. 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.