Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | Step 3.5 Flash 2603 | gpt-oss-120B (high) |
|---|---|---|
| Input ($/M tokens) | $0 | $0.15 |
| Output ($/M tokens) | $0 | $0.6 |
Data from Artificial Analysis API — 12 benchmarks
Step 3.5 Flash 2603 is cheaper overall. Its blended price (3:1 input/output ratio) is $0.00/M tokens vs $0.26/M for gpt-oss-120B (high).
gpt-oss-120B (high) wins 6 out of 12 benchmarks compared to 5 for Step 3.5 Flash 2603. See the detailed benchmark chart above for per-category results.
gpt-oss-120B (high) generates tokens faster at 208 tok/s vs 161 tok/s. However, gpt-oss-120B (high) has lower time-to-first-token (0.55s vs 0.80s).
Choose based on your priorities: Step 3.5 Flash 2603 for lower cost, gpt-oss-120B (high) for stronger benchmark performance, and gpt-oss-120B (high) for faster generation. For latency-sensitive apps, check the TTFT comparison above.