Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | Claude Opus 4.8 (Adaptive Reasoning, Max Effort) | gpt-oss-120b (low) |
|---|---|---|
| Input ($/M tokens) | $6.25 | $0.15 |
| Output ($/M tokens) | $25 | $0.6 |
Data from Artificial Analysis API — 12 benchmarks
gpt-oss-120b (low) is cheaper overall. Its blended price (3:1 input/output ratio) is $0.26/M tokens vs $10.94/M for Claude Opus 4.8 (Adaptive Reasoning, Max Effort).
Claude Opus 4.8 (Adaptive Reasoning, Max Effort) wins 7 out of 12 benchmarks compared to 4 for gpt-oss-120b (low). See the detailed benchmark chart above for per-category results.
gpt-oss-120b (low) generates tokens faster at 351 tok/s vs 66 tok/s. However, gpt-oss-120b (low) has lower time-to-first-token (0.50s vs 6.54s).
Choose based on your priorities: gpt-oss-120b (low) for lower cost, Claude Opus 4.8 (Adaptive Reasoning, Max Effort) for stronger benchmark performance, and gpt-oss-120b (low) for faster generation. For latency-sensitive apps, check the TTFT comparison above.