Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | GPT-5.4 mini (medium) | GLM-5.1 (Reasoning) |
|---|---|---|
| Input ($/M tokens) | $0.75 | $1.4 |
| Output ($/M tokens) | $4.5 | $4.4 |
Data from Artificial Analysis API — 12 benchmarks
GPT-5.4 mini (medium) is cheaper overall. Its blended price (3:1 input/output ratio) is $1.69/M tokens vs $2.15/M for GLM-5.1 (Reasoning).
GLM-5.1 (Reasoning) wins 6 out of 12 benchmarks compared to 1 for GPT-5.4 mini (medium). See the detailed benchmark chart above for per-category results.
GPT-5.4 mini (medium) generates tokens faster at 172 tok/s vs 53 tok/s. However, GLM-5.1 (Reasoning) has lower time-to-first-token (0.90s vs 3.42s).
Choose based on your priorities: GPT-5.4 mini (medium) for lower cost, GLM-5.1 (Reasoning) for stronger benchmark performance, and GPT-5.4 mini (medium) for faster generation. For latency-sensitive apps, check the TTFT comparison above.