Claude Sonnet 4.5 vs GLM 5.1
Head to head on 23 shared benchmarks, with price, context window, and release dates.
Benchmark scores
94evals · sort by any column, ⤢ to expand fullscreen
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| GLM 5.1 Zai | 64.5% | 1589elo | 73.5 | 33.5% | 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% | 22.2% | 36.1% | 71.2% | 35.6% | 31.5% | 97.1% | - | - | - | - | - | 20.8% | - | - | 35.9% | 1.13 | - | - | - | - | 40.0% | - | - | - | - | 44.8% | 34.7% | - | - | - | 15.1% | - | - | - | - | - | - | - | - | - | - | - | - | - | 67.0% | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 34.6% | 5.24 | - | - | - | - | - | - | - | - | - | - | 69.8 | - | 52.5% | - | - | 53.6% |
| Claude Sonnet 4.5 Anthropic | 60.8% | 1675elo | 71.4 | 15.2% | 72.7% | 7.2% | 42.7% | 70.7% | 80.4% | 57.0% | 53.4% | 76.5% | 79.3% | 77.6% | 40.6% | 84.5% | 86.0% | 19.0% | 42.8% | 73.3% | 28.8% | 22.6% | 70.5% | 0.0% | 0.0% | 37.0% | 100 | 0.0% | - | 0.0% | 0.0% | - | - | 5.0% | 0.0% | 0.0% | 0.0% | - | 0.0% | 0.0% | 0.0% | 0.0% | - | - | 0.0% | 0.0% | 83.9% | - | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 87.5% | 83.8% | 0.0% | 0.0% | 59.0% | 0.75 | 0.75 | 0.0% | - | 0 | 0 | 64.0% | 0.0% | 0.0% | 62.9% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 32.9% | 0.0% | - | - | 0 | 0.0% | 0.0% | 77.2% | 67.0% | 74.8% | 0.0% | 0 | 0 | 50.34 | - | 0 | - | 0.0% | 1.49 | 27.5% |
2 / 2 models
| Attribute | Claude Sonnet 4.5 Anthropic | GLM 5.1 Zai |
|---|---|---|
| Description | anthropic/claude-sonnet-4.5 is an AI model. | GLM-5.1 is an AI model from Zai, released with open weights. |
| Family | Claude | Glm |
| Params | Undisclosed (closed) | - |
| Open weights | closed | open |
| License | Proprietary | mit |
| Released | 29 Sep 2025 | 7 Apr 2026 |
| Context | 1,000,000 | 204,800 |
| Input $/1M | $3.00 | $1.39 |
| Output $/1M | $15.00 | $4.40 |
| Cache read $/1M | $0.300 | $0.234 |
| Cache write $/1M | $3.750 | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image, file | text |
| Providers | anthropic, aws-bedrock, vertex-ai | - |
| Publisher | Anthropic | Zai |
| Reported scores | TaxEval v273.3% LiveBench - Math79.3% (LiveBench) LiveBench - Coding80.4% (LiveBench) LiveBench - Language76.5% (LiveBench) LiveBench - Data Analysis57.0% (LiveBench) | 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 Sonnet 4.5 or GLM 5.1 better?
- Across the 23 benchmarks both models report on Sophon, GLM 5.1 leads on 15 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Sonnet 4.5 and GLM 5.1 compare on GPQA Diamond?
- Claude Sonnet 4.5 scores 72.7% and GLM 5.1 scores 83.9% on GPQA Diamond.
- Which is cheaper, Claude Sonnet 4.5 or GLM 5.1?
- GLM 5.1 is cheaper at $4.40 per million output tokens against $15.00 for Claude Sonnet 4.5 - about 3.4x.
- When were Claude Sonnet 4.5 and GLM 5.1 released?
- Claude Sonnet 4.5 was released 29 Sep 2025 by Anthropic. GLM 5.1 was released 7 Apr 2026 by Zai.
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