# Claude Fable 5 vs GLM-5.3

> Side-by-side benchmark comparison for Claude Fable 5 and GLM-5.3 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-fable-vs-glm-5-3
- Last updated: September 28, 2026

- Shared sourced benchmarks: 9
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Claude Fable 5 if you want the stronger benchmark profile. GLM-5.3 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Claude Fable 5 leads overall 78.89 to 65.44.
- The clearest category separation is in knowledge, where the averages are 81.7 for Claude Fable 5 and 61.9 for GLM-5.3.
- The biggest single benchmark swing is FrontierSWE v2 in Coding, with scores of 47.0% and 30.2%.
- GLM-5.3 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Claude Fable 5 | GLM-5.3 |
|----------|----------|----------|
| Creator | Anthropic | Z.AI |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M+ | 1M |
| Overall Score | 78.89 | 65.44 |
| Benchmarks Covered | 21 | 24 |
| Pricing (input/output) | $10.00 / $50.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Claude Fable 5
- Claude Fable 5 public-lane score: 73.8 (Supported · #4/117)
- GLM-5.3 public-lane score: 67.4 (Supported · #9/117)

| Benchmark | Claude Fable 5 | GLM-5.3 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 34.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 84.3% | 88.2% | GLM-5.3 |
| OSWorld-Verified | 85% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 80.5% | 71.5% | Claude Fable 5 |
| ApprenticeBench | 34% | Coming soon | Coming soon |
| terminalBench3 | Coming soon | 28.3% | Coming soon |
| CyberGym | Coming soon | 84.5% | Coming soon |
| ExploitGym | Coming soon | 15.0% | Coming soon |
| Toolathlon-Verified | Coming soon | 73.0% | Coming soon |
| AutomationBench | Coming soon | 48.2% | Coming soon |
| Agents' Last Exam | Coming soon | 28.5% | Coming soon |
| HLE w/ tools | Coming soon | 62.5% | Coming soon |

### Coding

- Winner: Claude Fable 5
- Claude Fable 5 public-lane score: 72.9 (Supported · #5/142)
- GLM-5.3 public-lane score: 56.8 (Supported · #24/142)

| Benchmark | Claude Fable 5 | GLM-5.3 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 95% | Coming soon | Coming soon |
| SWE-bench Pro | 80% | Coming soon | Coming soon |
| FrontierSWE v2 | 47.0% | 30.2% | Claude Fable 5 |
| FrontierCode 1.1 Main | 53.5% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 84.3% | 88.2% | GLM-5.3 |
| cursorBench31 | 70.6% | Coming soon | Coming soon |
| cursorBench32 | 70.5% | Coming soon | Coming soon |
| VulcanBench v3 | 89.5% | 78.3% | Claude Fable 5 |
| LiveCodeBench (Vals) | 89.8% | 80.5% | Claude Fable 5 |
| SWE-bench (Vals) | 95.0% | 95.4% | GLM-5.3 |
| terminalBench3 | Coming soon | 28.3% | Coming soon |
| DeepSWE | Coming soon | 66.9% | Coming soon |
| NL2Repo | Coming soon | 58% | Coming soon |
| ProgramBench | Coming soon | 19.0% | Coming soon |
| FrontierSWE | Coming soon | 78.1% | Coming soon |
| sweMarathon | Coming soon | 42.5% | Coming soon |
| PostTrain Bench | Coming soon | 39.8% | Coming soon |
| OpenHarmony Bench | Coming soon | 60.8% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Fable 5 public-lane score: 80.7 (Unranked · 4 rankable rows)
- GLM-5.3 public-lane score: 77.1 (#11/27)

| Benchmark | Claude Fable 5 | GLM-5.3 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | 98.50% | Coming soon | Coming soon |
| ARC-AGI-2 | 89.2% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Fable 5 public-lane score: 62.6 (Unranked · 2 rankable rows)
- GLM-5.3 public-lane score: Coming soon

| Benchmark | Claude Fable 5 | GLM-5.3 | Winner |
|-----------|-----------|-----------|--------|
| Blueprint-Bench 2 | 38.6% | Coming soon | Coming soon |
| OfficeQA Pro | 57.9% | Coming soon | Coming soon |

### Knowledge

- Winner: Claude Fable 5
- Claude Fable 5 public-lane score: 81.7 (Supported · #4/168)
- GLM-5.3 public-lane score: 61.9 (Supported · #35/168)

| Benchmark | Claude Fable 5 | GLM-5.3 | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 93.2% | 88.1% | Claude Fable 5 |
| MMLU-Pro (Vals) | 91.5% | 86.8% | Claude Fable 5 |

### Instruction Following

- Winner: Not comparable
- Claude Fable 5 public-lane score: 75.7 (#58/124)
- GLM-5.3 public-lane score: Coming soon

## FAQ

### Which is better overall, Claude Fable 5 or GLM-5.3?

Claude Fable 5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Fable 5 and GLM-5.3?

The widest category gap is in knowledge, where the averages are 81.7 for Claude Fable 5 and 61.9 for GLM-5.3.

### How many benchmarks does Claude Fable 5 cover on BenchLM?

Claude Fable 5 currently has 21 sourced benchmark scores on BenchLM.

### How many benchmarks does GLM-5.3 cover on BenchLM?

GLM-5.3 currently has 24 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Fable 5 vs Claude Fable 5.1](/compare/claude-fable-vs-claude-fable-5-1)
- [GLM-5.3 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-glm-5-3)
- [Claude Fable 5 vs GLM-5.2](/compare/claude-fable-vs-glm-5-2)
- [GLM-5.3 vs GLM-5.2](/compare/glm-5-2-vs-glm-5-3)

## Explore More

- [Claude Fable 5 profile](/models/claude-fable)
- [GLM-5.3 profile](/models/glm-5-3)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)