GPT-5.4 Mini vs GLM 5.1
GLM 5.1 is cheaper on output tokens, while GPT-5.4 Mini offers a larger context window. Choose GPT-5.4 Mini or GLM 5.1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GPT-5.4 Mini | GLM 5.1 |
|---|---|---|
| Provider | OpenAI | Z.ai |
| Input / 1M tokens | $0.75 | $1.40 |
| Output / 1M tokens | $4.50 | $4.40 |
| Context window | 400K | 205K |
| Parameters | — | 754B |
| Open weights | No | — |
| Released | Mar 2026 | Apr 2026 |
| LiveBench score | 67.7 | 70.6 |
| GPQA Diamond score | 86.9 | 89.9 |
| Epoch Capabilities Index score | 149 | 150 |
| FrontierMath score | 28.3 | 33.5 |
| LMArena (Chatbot Arena) Elo score | 1412 | 1463 |
| LMArena WebDev Elo score | 1397 | 1508 |
| LMArena Vision Elo score | 1245 | — |
FAQ
Is GPT-5.4 Mini or GLM 5.1 cheaper?
GLM 5.1 is cheaper on output tokens ($4.40 vs $4.50 per 1M).
Which has the larger context window, GPT-5.4 Mini or GLM 5.1?
GPT-5.4 Mini has the larger context window (400K tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.