Detailed comparison of capabilities, features, and performance.
| Feature | GLM 5.3 | Claude Fable 5 |
|---|---|---|
| AI Lab | Z.ai | Anthropic |
| Context Size | 1,000,000 tokens | 1,000,000 tokens |
| Max Output Size | 131,072 tokens | 128,000 tokens |
| Frontier Model | Yes | Yes |
| Vision Support | No | Yes |
| Description | GLM-5.3 uses the same base model as GLM-5.2 — every gain comes from post-training. Compared with GLM-5.2, it is significantly better at complex coding and long-horizon agentic tasks. 743B parameter MoE with a 1M-token context window. | Anthropic's most capable widely released model, with a 1M token context window, 128k max output, and always-on adaptive thinking. |
View detailed specifications and capabilities
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