Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | o4-mini (high) | GLM-5.1 (Reasoning) |
|---|---|---|
| Input ($/M tokens) | $1.1 | $1.4 |
| Output ($/M tokens) | $4.4 | $4.4 |
Data from Artificial Analysis API — 12 benchmarks
o4-mini (high) is cheaper overall. Its blended price (3:1 input/output ratio) is $1.93/M tokens vs $2.15/M for GLM-5.1 (Reasoning).
It's a tie — both models win 6 benchmarks each across 12 evaluated categories. See the detailed benchmark chart above for per-category results.
o4-mini (high) generates tokens faster at 171 tok/s vs 54 tok/s. However, GLM-5.1 (Reasoning) has lower time-to-first-token (0.86s vs 21.72s).
Choose based on your priorities: o4-mini (high) for lower cost, both perform similarly on benchmarks, and o4-mini (high) for faster generation. For latency-sensitive apps, check the TTFT comparison above.