Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | Claude 4.5 Sonnet (Reasoning) | GPT-5.4 (xhigh) |
|---|---|---|
| Input ($/M tokens) | $3 | $2.5 |
| Output ($/M tokens) | $15 | $15 |
Data from Artificial Analysis API — 12 benchmarks
GPT-5.4 (xhigh) is cheaper overall. Its blended price (3:1 input/output ratio) is $5.63/M tokens vs $6.00/M for Claude 4.5 Sonnet (Reasoning).
GPT-5.4 (xhigh) wins 7 out of 12 benchmarks compared to 4 for Claude 4.5 Sonnet (Reasoning). See the detailed benchmark chart above for per-category results.
GPT-5.4 (xhigh) generates tokens faster at 84 tok/s vs 58 tok/s. Claude 4.5 Sonnet (Reasoning) also has lower time-to-first-token (7.49s vs 147.97s).
Choose based on your priorities: GPT-5.4 (xhigh) for lower cost, GPT-5.4 (xhigh) for stronger benchmark performance, and GPT-5.4 (xhigh) for faster generation. For latency-sensitive apps, check the TTFT comparison above.