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Claude 4.5 Haiku (Non-reasoning) vs Step 3.5 Flash 2603
Anthropic vs StepFun — side-by-side benchmark comparison
| Claude 4.5 Haiku (Non-reasoning) | Step 3.5 Flash 2603 | |
|---|---|---|
| Intelligence Index | 31.0 | 38.5 |
| Coding Index | 29.6 | 34.6 |
| Math Index | 39.0 | — |
| Output speed (tok/s) | 105.8 | 167.8 |
| Blended price ($/1M) | $2.19 | $0.00 |
| Time to first token (s) | 0.65s | 0.88s |
| aime | — | — |
| aime 25 | 39.0% | — |
| artificial analysis coding index | 29.60 | 34.60 |
| artificial analysis intelligence index | 31.00 | 38.50 |
| artificial analysis math index | 39.00 | — |
| gpqa | 64.6% | 82.6% |
| hle | 4.3% | 22.6% |
| ifbench | 42.0% | 66.5% |
| lcr | 43.7% | 54.3% |
| livecodebench | 51.1% | — |
| math 500 | — | — |
| mmlu pro | 80.0% | — |
| scicode | 34.4% | 38.5% |
| tau2 | 32.5% | 87.4% |
| terminalbench hard | 27.3% | 32.6% |
Benchmark data from Artificial Analysis.