GLM-5.1
Zhipu AI
Key facts · verified Oct 29, 2026
GLM-5.1 is a Zhipu AI model released on 7 Apr 2026. Its API price is $1.40 per million input tokens and $4.40 per million output tokens. Its context window is 202.8K tokens. It ranks #54 on LMArena's text leaderboard (Elo 1465, read 1 Nov 2026). Source: docs.z.ai.
GLM-5.1 is a Zhipu AI model released through Z.ai on April 7, 2026, preceding GLM-5.2 and GLM-5.3. Z.ai lists API pricing of $1.40 per million input tokens and $4.40 per million output tokens, with a 202.8K-token context window. Its weights are published under the MIT licence; GLM-5.2 also uses MIT, while GLM-5.3 uses a custom GLM-5.3 License.
Pricing & specs checkedSource: vendor documentation · checked Oct 29, 2026LMArena: 1465 Elo (rank 54) · source · retrieved Nov 1, 2026
Key Features
Open Weights Coding Tool Use Self-Hostable
Full Specifications
$1.40 / $4.40 per million tokens | |
|---|---|
| Identity | |
| Developer | Zhipu AI |
| Released | Apr 2026 |
| Licence | Open weights (MIT) |
| Self-hostable | Yes |
| Cost | |
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $2.150 / 1M tokens |
| Input price | $1.400 / 1M tokens |
| Output price | $4.400 / 1M tokens |
| Capacity | |
| Context window | 202.8K tokens |
| Measured quality | |
| LMArena Elo | 1465 (checked Nov 2026) |
| LMArena rank | Rank 54 |
| GPQA Diamond | 90 |
| SWE-bench Verified | 74 |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | 681 |