Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | Claude 4 Opus (Reasoning) | GPT-5.5 (high) |
|---|---|---|
| Input ($/M tokens) | $18.75 | $5 |
| Output ($/M tokens) | $75 | $30 |
Data from Artificial Analysis API — 12 benchmarks
GPT-5.5 (high) is cheaper overall. Its blended price (3:1 input/output ratio) is $11.25/M tokens vs $32.81/M for Claude 4 Opus (Reasoning).
GPT-5.5 (high) wins 7 out of 12 benchmarks compared to 5 for Claude 4 Opus (Reasoning). See the detailed benchmark chart above for per-category results.
GPT-5.5 (high) generates tokens faster at 61 tok/s vs 40 tok/s. Claude 4 Opus (Reasoning) also has lower time-to-first-token (8.87s vs 19.21s).
Choose based on your priorities: GPT-5.5 (high) for lower cost, GPT-5.5 (high) for stronger benchmark performance, and GPT-5.5 (high) for faster generation. For latency-sensitive apps, check the TTFT comparison above.