Phi 4 vs GLM 5.1
Phi 4 is cheaper on output tokens, while GLM 5.1 offers a larger context window. Choose Phi 4 or GLM 5.1 based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Phi 4 | GLM 5.1 |
|---|---|---|
| Provider | Microsoft | Z.ai |
| Input / 1M tokens | $0.07 | $1.40 |
| Output / 1M tokens | $0.14 | $4.40 |
| Context window | 16K | 205K |
| Parameters | — | 754B |
| Open weights | — | — |
| Released | — | Apr 2026 |
| GPQA Diamond score | 56.1 | 89.9 |
| LMArena (Chatbot Arena) Elo score | 1217 | 1463 |
| Epoch Capabilities Index score | 130 | 150 |
| LiveBench score | — | 70.6 |
| FrontierMath score | — | 33.5 |
| LMArena WebDev Elo score | — | 1508 |
FAQ
Is Phi 4 or GLM 5.1 cheaper?
Phi 4 is cheaper on output tokens ($0.14 vs $4.40 per 1M).
Which has the larger context window, Phi 4 or GLM 5.1?
GLM 5.1 has the larger context window (205K tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.