Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | Claude 4 Sonnet (Reasoning) | GPT-5.4 (low) |
|---|---|---|
| Input ($/M tokens) | $3 | $2.5 |
| Output ($/M tokens) | $15 | $15 |
Data from Artificial Analysis API — 12 benchmarks
GPT-5.4 (low) is cheaper overall. Its blended price (3:1 input/output ratio) is $5.63/M tokens vs $6.00/M for Claude 4 Sonnet (Reasoning).
It's a tie — both models win 6 benchmarks each across 12 evaluated categories. See the detailed benchmark chart above for per-category results.
GPT-5.4 (low) generates tokens faster at 112 tok/s vs 0 tok/s. Claude 4 Sonnet (Reasoning) also has lower time-to-first-token (0.00s vs 1.15s).
Choose based on your priorities: GPT-5.4 (low) for lower cost, both perform similarly on benchmarks, and GPT-5.4 (low) for faster generation. For latency-sensitive apps, check the TTFT comparison above.