Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | Grok 4.1 Fast (Reasoning) | o3 |
|---|---|---|
| Input ($/M tokens) | $0 | $2 |
| Output ($/M tokens) | $0 | $8 |
Data from Artificial Analysis API — 12 benchmarks
Grok 4.1 Fast (Reasoning) is cheaper overall. Its blended price (3:1 input/output ratio) is $0.00/M tokens vs $3.50/M for o3.
Grok 4.1 Fast (Reasoning) wins 7 out of 12 benchmarks compared to 4 for o3. See the detailed benchmark chart above for per-category results.
o3 generates tokens faster at 125 tok/s vs 0 tok/s. Grok 4.1 Fast (Reasoning) also has lower time-to-first-token (0.00s vs 6.65s).
Choose based on your priorities: Grok 4.1 Fast (Reasoning) for lower cost, Grok 4.1 Fast (Reasoning) for stronger benchmark performance, and o3 for faster generation. For latency-sensitive apps, check the TTFT comparison above.