GLM-5.1
GLM-5.1 (Z.ai (Zhipu AI)) was released on Apr 7, 2026. In the Epoch AI capability ranking (ECI), it ranks #57 out of 267 models, with 149.99. On Arena, which measures human preference in blind comparisons, it has 1,514 ELO points (#36). Against models of the same generation, its best result is on WebDev Arena: 1,508, #12 of 49.
Where GLM-5.1 stands out and where it falls behind, by the numbers
GLM-5.1 has published results on 19 tests compiled by Epoch AI. The yardstick here is its generation: its position among the models released between Jul 11, 2025 and Jul 6, 2026 that took the same test. Against the whole archive, which includes 2023 models, a recent release lands near the top of almost everything, and that says nothing.
Where it stands out
Tests where it sits in the top third of its own generation.
Where it falls behind
Tests where it sits in the bottom half of its own generation.
See all 19 tests, one by one
| Test | Score | In its generation | Overall | Test record |
|---|---|---|---|---|
| GPQA Diamond | 89.9% | #17 / 63 | #40 / 173 | 96.4% Gemini 4 Argon |
| AIME 2024 and 2025 (OTIS) | 93.3% | #16 / 63 (tied with 3) | #45 / 168 | 100.0% GPT-5.5 |
| CritPt | 4.6% | #25 / 50 | #62 / 112 | 32.3% GPT-5.6 Sol |
| WeirdML | 57.1% | #22 / 53 | #36 / 112 | 93.6% GPT-6 Astra |
| SciCode | 44.8% | #28 / 46 | #66 / 104 | 66.9% Claude Opus 5.5 |
| Frontiermath Tiers 1 3 V2 | 36.8% | #28 / 41 | #59 / 86 | 93.7% GPT-6 Astra |
| ALE-Bench | 887 | #27 / 50 | #49 / 82 | 2,951 GPT-6 Astra |
| WebDev Arena | 1,508 | #12 / 49 | #41 / 82 | 1,820 Claude Opus 5.5 |
| SimpleQA Verified | 34.0% | #26 / 40 | #55 / 81 | 76.0% Gemini 4 Argon |
| Chess puzzles | 20.0% | #27 / 39 (tied with 1) | #60 / 80 | 76.0% GPT-6 Astra |
| ProofBench | 22.2% | #14 / 35 | #46 / 74 | 100.0% Claude Fable 5.1 |
| SimpleBench | 55.1% | #22 / 36 | #32 / 74 | 81.9% Claude Fable 5 |
| FrontierMath | 33.4% | #15 / 38 | #15 / 65 | 51.7% GPT-5.5 |
| Vending Bench 2 | 5,634 | #12 / 38 | #24 / 57 | 15,515 GPT-6 Astra |
| Apex Agents | 40.9% | #10 / 18 | #37 / 50 | 82.4% Gemini 4 Argon |
| FrontierMath tier 4 | 12.5% | #14 / 38 (tied with 2) | #14 / 48 | 39.6% GPT-5.5 Pro |
| SWE-bench Verified | 74.2% | #16 / 26 | #16 / 32 | 83.5% Claude Opus 4.7 |
| Gbaeval | 0.0% | #16 / 17 (tied with 1) | #21 / 22 | 79.6% Claude Opus 5 |
| Exploitbench | 18.1% | #6 / 8 | #6 / 8 | 47.4% GPT-5.5 |
For each test, the model's best effort level counts, as in the ranking. Source of the scores: Epoch AI, under CC BY 4.0.
What to compare GLM-5.1 with
The models from other labs closest in capability and released in the same period, at most two per lab. Click any of them to see its page.
| Model | Lab | ECI | ELO | LiveBench | Release |
|---|---|---|---|---|---|
| Inkling-Small | Thinking Machines | 150.18 | 1,463 | n/a | Jul 15, 2026 |
| Claude Opus 4.5 | Anthropic | 150.17 | 1,504 | 72.6 | Nov 24, 2025 |
| GPT-5 | OpenAI | 150.00 | 1,436 | n/a | Aug 7, 2025 |
| GLM-5.1 | Z.ai (Zhipu AI) | 149.99 | 1,514 | n/a | Apr 7, 2026 |
| Kimi K2.7 Code | Moonshot | 149.87 | n/a | 68.4 | Jun 12, 2026 |
| GPT-5.1 | OpenAI | 149.76 | 1,495 | n/a | Nov 13, 2025 |
| Qwen 3.6 Max (Preview) | Alibaba | 149.24 | 1,488 | n/a | Apr 20, 2026 |
GLM-5.1 or GPT-5?
GPT-5 is the model from another lab closest to GLM-5.1 in capability. Across the 15 tests both took, this is the score:
| Test | GLM-5.1 | GPT-5 |
|---|---|---|
| CritPt | 4.6% | 12.6% |
| Chess puzzles | 20.0% | 36.0% |
| Frontiermath Tiers 1 3 V2 | 36.8% | 55.4% |
| SimpleQA Verified | 34.0% | 50.1% |
| ALE-Bench | 887 | 1,162 |
| ProofBench | 22.2% | 18.0% |
| WeirdML | 57.1% | 60.7% |
| WebDev Arena | 1,508 | 1,420 |
| GPQA Diamond | 89.9% | 86.2% |
| SciCode | 44.8% | 42.9% |
Unweighted score: each test counts one point, whether math or coding. The dot marks who did better on each row.
Other models from Z.ai (Zhipu AI)
The models from the same lab closest in time, newest first.
| Model | Release | ECI | ELO | LiveBench | Access |
|---|---|---|---|---|---|
| GLM-5.3-Flash | Aug 20, 2026 | 153.23 | 1,528 | 71.6 | Open weights (unrestricted) |
| GLM-5.3 | Aug 14, 2026 | 155.91 | n/a | 76.1 | API access |
| GLM-5.2 | Jun 16, 2026 | 151.86 | n/a | 73.2 | Open weights (unrestricted) |
| GLM-5.1 | Apr 7, 2026 | 149.99 | 1,514 | n/a | Open weights (unrestricted) |
| GLM-5 | Feb 11, 2026 | 145.78 | 1,511 | n/a | Open weights (unrestricted) |
| GLM-4.7 | Dec 22, 2025 | 143.79 | 1,495 | n/a | Open weights (unrestricted) |
| GLM-4.6 | Sep 30, 2025 | 140.78 | 1,500 | n/a | Open weights (unrestricted) |
Have you used GLM-5.1? Rate it
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What people ask about GLM-5.1
Where does GLM-5.1 rank among AI models?
In the ROO3 AI Benchmark, ordered by the Epoch AI ECI, GLM-5.1 ranks #57 out of 267 models, with an ECI of 149.99. The ECI is a composite index that combines several hard benchmarks into a single scale. The position changes when a new model comes out, and the page is refreshed six times a day.
Is GLM-5.1 better than GPT-5?
Across the 15 tests both models took and Epoch AI compiled, GLM-5.1 comes out ahead on 7, behind on 7 and tied on 1. It is a test-by-test count with no weighting: a win in math counts the same as a win in coding. To choose between the two, look at the tests that resemble your own use.
What is GLM-5.1 best at?
Against models of the same generation (released up to 9 months before and up to 3 months after it), the best relative results of GLM-5.1 are: WebDev Arena (#12 of 49); GPQA Diamond (#17 of 63); AIME 2024 and 2025 (OTIS) (#16 of 63). The yardstick is its position among the models of that period that took the same test.
Where do the numbers on this page come from?
From the same three sources as the ranking, all openly licensed: Epoch AI (ECI and individual tests, CC BY 4.0), Arena (human-preference ELO, CC BY 4.0) and LiveBench (overall average, CC BY-SA 4.0). ROO3 does not measure any model. When the page shows a figure published by the maker itself, it appears in the written analysis, labeled as the maker's, and never enters the ranking.
Where each number comes from
Epoch AI, "AI Benchmarking Hub". Published at epoch.ai. Data under the CC BY 4.0 licence, reordered by roo3.co.
The Arena (LMArena) leaderboard, from the public lmarena-ai/leaderboard-dataset on Hugging Face, under the CC BY 4.0 licence. We are not affiliated with the Arena.
LiveBench, by the LiveBench team, published at livebench.ai under the CC BY-SA 4.0 license. The overall average is recomputed by roo3.co with the same formula as the website (average of the categories), and those numbers stay under CC BY-SA 4.0. We are not affiliated with LiveBench.
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