Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | GPT-5.5 (medium) | Claude Opus 4.8 (Adaptive Reasoning, Max Effort) |
|---|---|---|
| Input ($/M tokens) | $5 | $6.25 |
| Output ($/M tokens) | $30 | $25 |
Data from Artificial Analysis API — 12 benchmarks
Claude Opus 4.8 (Adaptive Reasoning, Max Effort) is cheaper overall. Its blended price (3:1 input/output ratio) is $10.94/M tokens vs $11.25/M for GPT-5.5 (medium).
Claude Opus 4.8 (Adaptive Reasoning, Max Effort) wins 4 out of 12 benchmarks compared to 2 for GPT-5.5 (medium). See the detailed benchmark chart above for per-category results.
Claude Opus 4.8 (Adaptive Reasoning, Max Effort) generates tokens faster at 60 tok/s vs 49 tok/s. GPT-5.5 (medium) also has lower time-to-first-token (9.05s vs 26.26s).
Choose based on your priorities: Claude Opus 4.8 (Adaptive Reasoning, Max Effort) for lower cost, Claude Opus 4.8 (Adaptive Reasoning, Max Effort) for stronger benchmark performance, and Claude Opus 4.8 (Adaptive Reasoning, Max Effort) for faster generation. For latency-sensitive apps, check the TTFT comparison above.