GLM 5.1 vs GPT-4o
Head to head on 14 shared benchmarks, with price, context window, and release dates.
Benchmark scores
54evals · sort by any column, ⤢ to expand fullscreen
| Model | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| GLM 5.1 Zai | 64.5% | 33.5% | 83.9% | 27.9% | 52.0% | 72.7% | 75.4% | 68.5% | 71.8% | 85.4% | 36.1% | 71.2% | 35.6% | 97.1% | - | - | - | - | 20.8% | 35.9% | 1.13 | - | - | 40.0% | - | 1589elo | 73.5 | 44.8% | 34.7% | 15.1% | - | - | 63.2% | 84.9% | 72.5% | - | - | 67.0% | 41.6% | - | 72.3% | - | - | 22.2% | - | 34.6% | 5.24 | - | - | 69.8 | - | 52.5% | 31.5% | - | 53.6% |
| GPT-4o OpenAI | 45.9% | 0.3% | 54.3% | 2.4% | 34.3% | 55.1% | 46.1% | 70.1% | 49.0% | 74.8% | 33.3% | 74.5% | 8.3% | 25.1% | 18.2% | 15.0% | 6.0% | 38 | - | - | - | 0.0% | 0.33 | - | 6.1% | - | - | - | - | - | 96.1 | 0.0% | - | - | - | 30.9% | 75.9% | - | - | 10.8% | - | 57.4% | 54.0% | - | 5.71 | - | - | 21.6% | 61.2 | - | 0.98 | - | - | 32.5% | 33.4% |
2 / 2 models
| Attribute | GLM 5.1 Zai | GPT-4o OpenAI |
|---|---|---|
| Description | GLM-5.1 is an AI model from Zai, released with open weights. | GPT-4o is an AI model from OpenAI. |
| Family | Glm | GPT |
| Params | - | - |
| Open weights | open | closed |
| License | mit | proprietary |
| Released | 7 Apr 2026 | 20 Nov 2024 |
| Context | 204,800 | 128,000 |
| Input $/1M | $1.39 | $2.50 |
| Output $/1M | $4.40 | $10.00 |
| Cache read $/1M | $0.234 | $1.250 |
| Cache write $/1M | - | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text | text, image, file |
| Providers | - | - |
| Publisher | Zai | OpenAI |
| Reported scores | IFBench52.0% (AA) τ²-bench (Tau²-bench)97.1% (AA) Terminal-Bench (Hard)35.6% (AA) Vals Index52.5% Vibe Code Bench v1.131.5% | Taubench61.2 pass^1 GSM8K96.1 Accuracy ScholarSearch5.71 Social Sciences & Humanities (%) MortgageTax57.4% AIME202438 pass@1 |
FAQ
- Is GLM 5.1 or GPT-4o better?
- Across the 14 benchmarks both models report on Sophon, GLM 5.1 leads on 12 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do GLM 5.1 and GPT-4o compare on GPQA Diamond?
- GLM 5.1 scores 83.9% and GPT-4o scores 54.3% on GPQA Diamond.
- Which is cheaper, GLM 5.1 or GPT-4o?
- GLM 5.1 is cheaper at $4.40 per million output tokens against $10.00 for GPT-4o - about 2.3x.
- When were GLM 5.1 and GPT-4o released?
- GLM 5.1 was released 7 Apr 2026 by Zai. GPT-4o was released 20 Nov 2024 by OpenAI.
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