Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | Gemini 2.5 Flash (Reasoning) | Grok 4.3 |
|---|---|---|
| Input ($/M tokens) | $0.3 | $1.25 |
| Output ($/M tokens) | $2.5 | $2.5 |
Data from Artificial Analysis API — 12 benchmarks
Gemini 2.5 Flash (Reasoning) is cheaper overall. Its blended price (3:1 input/output ratio) is $0.85/M tokens vs $1.56/M for Grok 4.3.
Grok 4.3 wins 7 out of 12 benchmarks compared to 5 for Gemini 2.5 Flash (Reasoning). See the detailed benchmark chart above for per-category results.
Gemini 2.5 Flash (Reasoning) generates tokens faster at 212 tok/s vs 85 tok/s. However, Grok 4.3 has lower time-to-first-token (10.70s vs 11.41s).
Choose based on your priorities: Gemini 2.5 Flash (Reasoning) for lower cost, Grok 4.3 for stronger benchmark performance, and Gemini 2.5 Flash (Reasoning) for faster generation. For latency-sensitive apps, check the TTFT comparison above.