Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | GPT-5 nano (high) | Gemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) |
|---|---|---|
| Input ($/M tokens) | $0.05 | $0.1 |
| Output ($/M tokens) | $0.4 | $0.4 |
Data from Artificial Analysis API — 12 benchmarks
GPT-5 nano (high) is cheaper overall. Its blended price (3:1 input/output ratio) is $0.14/M tokens vs $0.17/M for Gemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning).
GPT-5 nano (high) wins 8 out of 12 benchmarks compared to 3 for Gemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning). See the detailed benchmark chart above for per-category results.
Gemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) generates tokens faster at 347 tok/s vs 133 tok/s. However, Gemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) has lower time-to-first-token (13.81s vs 95.74s).
Choose based on your priorities: GPT-5 nano (high) for lower cost, GPT-5 nano (high) for stronger benchmark performance, and Gemini 2.5 Flash-Lite Preview (Sep '25) (Reasoning) for faster generation. For latency-sensitive apps, check the TTFT comparison above.