Claude Fable 5 vs GLM-5.3
Claude Fable 5 (Anthropic) and GLM-5.3 (Z.ai (Zhipu AI)) compared on benchmarks, pricing, context window, and use-case rankings.
- Claude Fable 5 leads on overall intelligence (ECI 163 vs 155).
- GLM-5.3 is cheaper on input tokens — $0.06 vs $10.00 per 1M.
- GLM-5.3 has a larger context window (1M vs 1M tokens).
- Claude Fable 5 ranks higher for coding (91th vs 90th percentile).
| Attribute | Claude Fable 5 | GLM-5.3 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 163 | 155 |
| Coding | 91 | 90 |
| Math | 91 | 44 |
| Reasoning & Knowledge | 86 | 67 |
| Agentic & Tools | 92 | 79 |
| Specifications | ||
| Developer | Anthropic | Z.ai (Zhipu AI) |
| Family | Claude | — |
| Released | Jun 9, 2026 | Aug 14, 2026 |
| Parameters | — | 744B |
| Availability | API access | API access |
| Context window | 1M | 1M |
| Price — $/M input | $10.00 | $0.06 |
| Price — $/M output | $50.00 | $2.86 |
| Inputs | text, image, file | text |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 100% | 91% |
| APEX | 64% | 57% |
| ARC-AGI | 99% | — |
| ARC-AGI-2 | 89% | — |
| GPQA Diamond | 86% | 91% |
| GSO (code optimization) | 78% | — |
| Humanity's Last Exam | 56% | 42% |
| SciCode | 61% | 59% |
| SimpleBench | 82% | — |
| SimpleQA Verified | 71% | 41% |
| WebDev Arena | 1628 | 1614 |
| WeirdML | 92% | 75% |
| τ²-bench | 99% | — |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Is Claude Fable 5 better than GLM-5.3?
On Epoch AI's Capabilities Index, Claude Fable 5 scores higher (163) than GLM-5.3 (155). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is cheaper, Claude Fable 5 or GLM-5.3?
GLM-5.3 is cheaper on input tokens at $0.06 per million, versus $10.00 (representative OpenRouter pricing).
Which has a larger context window, Claude Fable 5 or GLM-5.3?
GLM-5.3 supports up to 1M tokens, compared with 1M for the other.
Which is better for coding, Claude Fable 5 or GLM-5.3?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, Claude Fable 5 ranks higher — 91th vs 90th percentile among the models tracked on Model Beat.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.