Claude 4 Sonnet vs GLM 5.1
Head to head on 20 shared benchmarks, with price, context window, and release dates.
Benchmark scores
55evals · sort by any column, ⤢ to expand fullscreen
| Model | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Claude 4 Sonnet Anthropic | 54.7% | 1480elo | 58.4 | 68.3% | 4.3% | 45.4% | 64.8% | 77.5% | 54.6% | 44.3% | 72.9% | 70.5% | 69.0% | 33.9% | 72.4% | 83.7% | 37.3% | 69.6% | 27.3% | 52.3% | 40.7% | 38.0% | - | - | - | 22.9% | 47.8% | - | 19.8% | - | - | - | 67.5% | - | 44.9% | 93.4% | - | 86.7% | 62.5% | 43.9% | - | 6.18 | 6.18 | 35.0% | - | - | 58.3% | 35.6% | 74.6% | - | 0.59 | - | - | 84.0% | 84.0% | 55.5% |
| GLM 5.1 Zai | 64.5% | 1589elo | 73.5 | 83.9% | 27.9% | 52.0% | 72.7% | 75.4% | 63.2% | 68.5% | 71.8% | 84.9% | 72.5% | 41.6% | 72.3% | 85.4% | 36.1% | 71.2% | 35.6% | 97.1% | - | - | 20.8% | 35.9% | 1.13 | - | - | 40.0% | - | 44.8% | 33.5% | 34.7% | - | 15.1% | - | - | 67.0% | - | - | - | 22.2% | - | - | - | 34.6% | 5.24 | - | - | - | 69.8 | - | 52.5% | 31.5% | - | - | 53.6% |
2 / 2 models
| Attribute | Claude 4 Sonnet Anthropic | GLM 5.1 Zai |
|---|---|---|
| Description | Claude 4 Sonnet is an AI model from Anthropic. | GLM-5.1 is an AI model from Zai, released with open weights. |
| Family | Claude | Glm |
| Params | - | - |
| Open weights | closed | open |
| License | proprietary | mit |
| Released | 22 May 2025 | 7 Apr 2026 |
| Context | 200,000 | 204,800 |
| Input $/1M | $3.00 | $1.39 |
| Output $/1M | $15.00 | $4.40 |
| Cache read $/1M | - | $0.234 |
| Cache write $/1M | - | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image | text |
| Providers | - | - |
| Publisher | Anthropic | Zai |
| 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% |
FAQ
- Is Claude 4 Sonnet or GLM 5.1 better?
- Across the 20 benchmarks both models report on Sophon, GLM 5.1 leads on 16 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude 4 Sonnet and GLM 5.1 compare on GPQA Diamond?
- Claude 4 Sonnet scores 68.3% and GLM 5.1 scores 83.9% on GPQA Diamond.
- Which is cheaper, Claude 4 Sonnet or GLM 5.1?
- GLM 5.1 is cheaper at $4.40 per million output tokens against $15.00 for Claude 4 Sonnet - about 3.4x.
- When were Claude 4 Sonnet and GLM 5.1 released?
- Claude 4 Sonnet was released 22 May 2025 by Anthropic. GLM 5.1 was released 7 Apr 2026 by Zai.
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