Claude Fable 5.1 vs GLM-5.3: Specs & Benchmark Comparison
| Characteristic | Claude Fable 5.1 | GLM-5.3 |
|---|---|---|
| Company | Anthropic | Zhipu AI |
| Release Date | September 1, 2026 | August 14, 2026 |
| Parameters | — | 753B |
| Multimodal | Yes | No |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 128K | 131K |
| Input Price / 1M | $10.00 | $1.40 |
| Output Price / 1M | $50.00 | $4.40 |
| Average Score | 0.6 | 0.8 |
Verdict
Both models show equal results — the choice depends on your specific use case.
Overall Performance
Both models show comparable average scores: Claude Fable 5.1 — 0.6, GLM-5.3 — 0.8.
API Cost
GLM-5.3 is 10.3x cheaper: input $1.40/1M vs $10.00/1M tokens.
Context Window
Same context size: 1M tokens.
Recency
Claude Fable 5.1 is newer: released 9/1/2026 vs 8/14/2026.
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Frequently Asked Questions
Which is better for coding — Claude Fable 5.1 or GLM-5.3?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — Claude Fable 5.1 or GLM-5.3?
GLM-5.3 is cheaper for input: $1.40 per 1M tokens vs $10.00.
Which has a larger context window — Claude Fable 5.1 or GLM-5.3?
Claude Fable 5.1 supports a larger context: 1,048,576 tokens vs 1,048,576.
The Claude Fable 5.1 and GLM-5.3 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Fable 5.1 or GLM-5.3 page. See also the complete list of AI model comparisons.