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Step 5 Preview
GLM-5.1
GLM-5.1 is an open-weight model from Z.ai, released Apr 7, 2026. It ranks #39 of 351 on the LMArena text leaderboard with a rating of 1463. It costs $1.40 per million input tokens and $4.40 per million output tokens, with a 200K-token context window.
- Developer
- Z.ai (Zhipu AI)
- Released
- Apr 7, 2026
- Context window
- 200K
- Price in / out, per 1M tokens
- $1.40 / $4.40
- Weights
- Open · MIT
- Inputs
- Text
- Reasoning
- Yes
- Tool use
- Yes
- Hugging Face downloads, 30 days
- 702.2K
- Hugging Face likes
- 1.9K
The rating LMArena published at each update since Apr 7, 2026. Ratings move as votes come in and new models join.
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| SWE-benchCoding | 76.40% | 38 / 85 | $0.46 | |
| Vibe Code BenchCoding | 31.46% | 73 / 115 | $2.89 | |
| LiveCodeBenchCoding | 81.38% | 63 / 143 | $1 / $3.2 | |
| Legal Research BenchLaw | 27.89% | 57 / 85 | $0.39 | |
| MedCodeMedicine | 41.60% | 52 / 107 | $1 / $3.2 | |
| GPQA DiamondReasoning | 84.52% | 52 / 138 | $1 / $3.2 | |
| MMLU-ProReasoning | 86.90% | 37 / 138 | $1 / $3.2 | |
| AIMEReasoning | 91.88% | 22 / 96 | $1 / $3.2 |
Vals AI, as of Oct 24, 2026.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1463 | 39 / 351 | 65.4K |
| CodingLMArena | 1486 | 45 / 346 | 17.7K |
| MathLMArena | 1474 | 42 / 339 | 3.2K |
| Creative writingLMArena | 1453 | 32 / 349 | 12.8K |
| Instruction followingLMArena | 1452 | 49 / 351 | 22.9K |
| Hard promptsLMArena | 1473 | 45 / 351 | 42.7K |
| Multi-turnLMArena | 1472 | 33 / 349 | 10.3K |
| Long queriesLMArena | 1467 | 44 / 330 | 29.4K |
| ExpertLMArena | 1478 | 50 / 305 | 7K |
| Legal and governmentIndustries | 1465 | 45 / 325 | 5.1K |
| Medicine and healthcareIndustries | 1473 | 33 / 325 | 4.6K |
| Business and financeIndustries | 1452 | 41 / 344 | 12.5K |
| ChineseLanguages | 1514 | 35 / 328 | 4.6K |
| SpanishLanguages | 1469 | 32 / 249 | 2.2K |
| GermanLanguages | 1467 | 34 / 261 | 1.1K |
| FrenchLanguages | 1471 | 50 / 252 | 2.4K |
| JapaneseLanguages | 1435 | 41 / 236 | 906 |
| WebDevLMArena | 1508 | 61 / 124 | 10.7K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown.
Compare GLM-5.1
Z.ai (Zhipu AI)
A Tsinghua spin-out that builds the GLM family of open bilingual models. Founded 2019, based in Beijing. z.ai
Questions
Who makes GLM-5.1?
GLM-5.1 is made by Z.ai (Zhipu AI), founded 2019 and based in Beijing.
How much does GLM-5.1 cost?
$1.40 per million input tokens and $4.40 per million output tokens, at its provider’s list price.
What is GLM-5.1’s context window?
200K tokens (204,800).
How does GLM-5.1 rank?
#39 of 351 on LMArena’s text leaderboard, rated 1463 (95% interval 1459–1466) from 65,402 votes, as of Oct 22, 2026.
Is GLM-5.1 open source?
GLM-5.1 has open weights under the MIT license, downloadable from Hugging Face (zai-org/GLM-5.1).