# Claude Fable 5 vs GLM-5.3-Flash

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

- Canonical page: https://benchlm.ai/compare/claude-fable-vs-glm-5-3-flash
- Last updated: October 10, 2026

- Shared sourced benchmarks: 9
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Claude Fable 5 leads by point estimate. Conditional score ranges do not establish rank confidence. Choose using the category evidence and your own workload tests.

## Summary

- Claude Fable 5 has the higher overall point estimate 79.16 to 57.36. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in coding, where the averages are 71.6 for Claude Fable 5 and 49.3 for GLM-5.3-Flash.
- The biggest single benchmark swing is FrontierSWE v2 in Coding, with scores of 47.0% and 18.1%.
- GLM-5.3-Flash 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-Flash |
|----------|----------|----------|
| Creator | Anthropic | Z.AI |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M+ | 1M |
| Overall Score | 79.16 | 57.36 |
| Benchmarks Covered | 21 | 21 |
| Pricing (input/output) | $10.00 / $50.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Claude Fable 5
- Claude Fable 5 public-lane score: 74.7 (Supported · #5/123)
- GLM-5.3-Flash public-lane score: 55.7 (Supported · #34/123)

| Benchmark | Claude Fable 5 | GLM-5.3-Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 34.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 84.3% | 84.3% | Tie |
| OSWorld-Verified | 85% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 80.5% | 62.9% | Claude Fable 5 |
| ApprenticeBench | 34% | Coming soon | Coming soon |
| Toolathlon-Verified | Coming soon | 78.4% | Coming soon |
| AutomationBench | Coming soon | 48.8% | Coming soon |
| Agents' Last Exam | Coming soon | 26.3% | Coming soon |
| HLE w/ tools | Coming soon | 55.3% | Coming soon |

### Coding

- Winner: Claude Fable 5
- Claude Fable 5 public-lane score: 71.6 (Supported · #6/146)
- GLM-5.3-Flash public-lane score: 49.3 (Supported · #42/146)

| Benchmark | Claude Fable 5 | GLM-5.3-Flash | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 95% | Coming soon | Coming soon |
| SWE-bench Pro | 80% | Coming soon | Coming soon |
| FrontierSWE v2 | 47.0% | 18.1% | Claude Fable 5 |
| FrontierCode 1.1 Main | 53.5% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 84.3% | 84.3% | Tie |
| cursorBench31 | 70.6% | Coming soon | Coming soon |
| CursorBench 3.2 | 70.5% | Coming soon | Coming soon |
| VulcanBench v3 | 89.5% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 89.8% | 80.5% | Claude Fable 5 |
| SWE-bench (Vals) | 95.0% | 92.0% | Claude Fable 5 |
| DeepSWE | Coming soon | 63.4% | Coming soon |
| NL2Repo | Coming soon | 56.3% | Coming soon |
| OpenHarmony Bench | Coming soon | 57.3% | Coming soon |
| Bug Hunt Bench | Coming soon | 17.7 fixes | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Fable 5 public-lane score: 84.4 (Unranked · 4 rankable rows)
- GLM-5.3-Flash public-lane score: 81.1 (#11/28)

| Benchmark | Claude Fable 5 | GLM-5.3-Flash | 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: 66 (Unranked · 2 rankable rows)
- GLM-5.3-Flash public-lane score: 84 (#14/54)

| Benchmark | Claude Fable 5 | GLM-5.3-Flash | Winner |
|-----------|-----------|-----------|--------|
| Blueprint-Bench 2 | 38.6% | Coming soon | Coming soon |
| OfficeQA Pro | 57.9% | 62.4% | GLM-5.3-Flash |
| CharXiv | Coming soon | 89.4% | Coming soon |
| Chartography (tools) | Coming soon | 78.0% | Coming soon |
| BabyVision | Coming soon | 53.4% | Coming soon |
| MMVU | Coming soon | 80.5% | Coming soon |

### Knowledge

- Winner: Claude Fable 5
- Claude Fable 5 public-lane score: 82.3 (Supported · #6/177)
- GLM-5.3-Flash public-lane score: 60.5 (Supported · #43/177)

| Benchmark | Claude Fable 5 | GLM-5.3-Flash | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 93.2% | 86.4% | Claude Fable 5 |
| MMLU-Pro (Vals) | 91.5% | 86.1% | Claude Fable 5 |

### Instruction Following

- Winner: Not comparable
- Claude Fable 5 public-lane score: 77.1 (#59/127)
- GLM-5.3-Flash public-lane score: Coming soon

## FAQ

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

Claude Fable 5 has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

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

The widest category gap is in coding, where the averages are 71.6 for Claude Fable 5 and 49.3 for GLM-5.3-Flash.

### 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-Flash cover on BenchLM?

GLM-5.3-Flash currently has 21 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-Flash vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-glm-5-3-flash)
- [Claude Fable 5 vs GLM-5.3](/compare/claude-fable-vs-glm-5-3)
- [GLM-5.3-Flash vs GLM-5.3](/compare/glm-5-3-vs-glm-5-3-flash)

## Explore More

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