GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks. Unlike previous models built around minute-level interactions, GLM-5.1 can work independently and continuously on...
Z.ai: GLM 5.1 — Z.ai. Context window 204,800 tokens. API pricing (per 1M tokens): Input $1.4, Output $4.4. License: Proprietary. LMArena 1,461. GPQA Diamond 89.9%.
| Provider | Z.ai |
|---|---|
| API model ID | z-ai/glm-5.1 |
| Tier | Frontier |
| Context window | 204,800 tokens |
| Max output | 131,072 tokens |
| License | Proprietary |
| API pricing (per 1M tokens) · Input | $1.4 |
| API pricing (per 1M tokens) · Output | $4.4 |
| LMArena | 1,461 (glm-5.1) |
| GPQA Diamond | 89.9% |
LMArena (CC-BY 4.0, best reasoning setting, 2026-10-02) · GPQA Diamond: Epoch AI (CC-BY 4.0)
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