Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | Gemini 3 Flash Preview (Reasoning) | Sonar Reasoning Pro |
|---|---|---|
| Input ($/M tokens) | $0.5 | $0 |
| Output ($/M tokens) | $3 | $0 |
Data from Artificial Analysis API — 12 benchmarks
Sonar Reasoning Pro is cheaper overall. Its blended price (3:1 input/output ratio) is $0.00/M tokens vs $1.13/M for Gemini 3 Flash Preview (Reasoning).
Gemini 3 Flash Preview (Reasoning) wins 11 out of 12 benchmarks compared to 1 for Sonar Reasoning Pro. See the detailed benchmark chart above for per-category results.
Gemini 3 Flash Preview (Reasoning) generates tokens faster at 180 tok/s vs 0 tok/s. However, Sonar Reasoning Pro has lower time-to-first-token (0.00s vs 6.33s).
Choose based on your priorities: Sonar Reasoning Pro for lower cost, Gemini 3 Flash Preview (Reasoning) for stronger benchmark performance, and Gemini 3 Flash Preview (Reasoning) for faster generation. For latency-sensitive apps, check the TTFT comparison above.