Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | Gemini 2.5 Flash Preview (Reasoning) | GPT-5.4 (Non-reasoning) |
|---|---|---|
| Input ($/M tokens) | $0 | $2.5 |
| Output ($/M tokens) | $0 | $15 |
Data from Artificial Analysis API — 12 benchmarks
Gemini 2.5 Flash Preview (Reasoning) is cheaper overall. Its blended price (3:1 input/output ratio) is $0.00/M tokens vs $5.63/M for GPT-5.4 (Non-reasoning).
GPT-5.4 (Non-reasoning) wins 6 out of 12 benchmarks compared to 4 for Gemini 2.5 Flash Preview (Reasoning). See the detailed benchmark chart above for per-category results.
GPT-5.4 (Non-reasoning) generates tokens faster at 62 tok/s vs 0 tok/s. Gemini 2.5 Flash Preview (Reasoning) also has lower time-to-first-token (0.00s vs 0.65s).
Choose based on your priorities: Gemini 2.5 Flash Preview (Reasoning) for lower cost, GPT-5.4 (Non-reasoning) for stronger benchmark performance, and GPT-5.4 (Non-reasoning) for faster generation. For latency-sensitive apps, check the TTFT comparison above.