# Claude Fable 5.1 vs Qwen3.5 Flash

> Side-by-side benchmark comparison for Claude Fable 5.1 and Qwen3.5 Flash across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-fable-5-1-vs-qwen3-5-flash
- Last updated: October 17, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Claude Fable 5.1 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 5.1 has the higher overall point estimate 83.18 to 42.82. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in mathematics, where the averages are 96.8 for Claude Fable 5.1 and 36.3 for Qwen3.5 Flash.
- The biggest single benchmark swing is FrontierMath v2 (Tiers 1-3) in Mathematics, with scores of 90.175% and 18.246%.
- Qwen3.5 Flash is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Claude Fable 5.1 | Qwen3.5 Flash |
|----------|----------|----------|
| Creator | Anthropic | Alibaba |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 83.18 | 42.82 |
| Benchmarks Covered | 33 | 5 |
| Pricing (input/output) | $10.00 / $50.00 | $0.10 / $0.40 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: 80.9 (Supported · #2/128)
- Qwen3.5 Flash public-lane score: Coming soon

| Benchmark | Claude Fable 5.1 | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | 55.80% | Coming soon | Coming soon |
| Terminal-Bench-Science 0.1 | 52.6% | Coming soon | Coming soon |
| OSWorld 2.0 | 41.7% | Coming soon | Coming soon |
| AutomationBench | 31.4% | Coming soon | Coming soon |
| Toolathlon-Verified | 77.8% | Coming soon | Coming soon |
| Toolathlon Verified Pass@3 | 81.5% | Coming soon | Coming soon |
| Toolathlon Verified Pass³ | 73.1% | Coming soon | Coming soon |
| Toolathlon Verified avg. turns | 23.7 turns | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 85.0% | Coming soon | Coming soon |
| ApprenticeBench | 72% | Coming soon | Coming soon |
| CWE-bench v1 | 58.0% | Coming soon | Coming soon |
| MazeBench | 10% | Coming soon | Coming soon |

### Coding

- Winner: Directional only
- Claude Fable 5.1 public-lane score: 76.8 (Supported · #3/150)
- Qwen3.5 Flash public-lane score: 26.9 (Estimated · #102/150)

| Benchmark | Claude Fable 5.1 | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| Bug Hunt Bench | 43.0 fixes | Coming soon | Coming soon |
| SWE-bench Pro | 81.2% | Coming soon | Coming soon |
| SWE Multilingual | 89.1% | Coming soon | Coming soon |
| SWE Multimodal | 54.7% | Coming soon | Coming soon |
| DeepSWE | 67.4% | Coming soon | Coming soon |
| FrontierSWE v2 | 56.3% | Coming soon | Coming soon |
| ProgramBench | 87.6% | Coming soon | Coming soon |
| CursorBench 3.2 | 73.4% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 90.5% | 83.3% | Claude Fable 5.1 |
| CursorBench 4.0 | 51.8% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 40.2% | Coming soon | Coming soon |
| SWE-bench (Vals) | Coming soon | 64.4% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: 85.2 (#4/28)
- Qwen3.5 Flash public-lane score: Coming soon

| Benchmark | Claude Fable 5.1 | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | 97.50% | Coming soon | Coming soon |
| ARC-AGI-2 | 90% | Coming soon | Coming soon |
| GraphWalks BFS 256K–1M | 65.0% | Coming soon | Coming soon |

### Knowledge

- Winner: Directional only
- Claude Fable 5.1 public-lane score: 86.9 (Supported · #2/184)
- Qwen3.5 Flash public-lane score: 44.6 (Estimated · #99/184)

| Benchmark | Claude Fable 5.1 | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| HLE | 65% | Coming soon | Coming soon |
| HLE w/o tools | 60.9% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 93.4% | 82.8% | Claude Fable 5.1 |
| MMLU-Pro (Vals) | 92.4% | 84.1% | Claude Fable 5.1 |

### Instruction Following

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: Coming soon
- Qwen3.5 Flash public-lane score: Coming soon

| Benchmark | Claude Fable 5.1 | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | 1.0% | Coming soon | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: 96.8 (Unranked · 2 rankable rows)
- Qwen3.5 Flash public-lane score: 36.3 (Unranked · 1 rankable row)

| Benchmark | Claude Fable 5.1 | Qwen3.5 Flash | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 90.175% | 18.246% | Claude Fable 5.1 |
| FrontierMath v2 (Tier 4) | 87.805% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude Fable 5.1 or Qwen3.5 Flash?

Claude Fable 5.1 has the higher overall point estimate. Conditional score ranges do not establish rank confidence.

### Where is the biggest gap between Claude Fable 5.1 and Qwen3.5 Flash?

The widest category gap is in mathematics, where the averages are 96.8 for Claude Fable 5.1 and 36.3 for Qwen3.5 Flash.

### How many benchmarks does Claude Fable 5.1 cover on BenchLM?

Claude Fable 5.1 currently has 33 sourced benchmark scores on BenchLM.

### How many benchmarks does Qwen3.5 Flash cover on BenchLM?

Qwen3.5 Flash currently has 5 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Fable 5.1 vs Claude Fable 5](/compare/claude-fable-vs-claude-fable-5-1)
- [Qwen3.5 Flash vs Claude Fable 5](/compare/claude-fable-vs-qwen3-5-flash)
- [Claude Fable 5.1 vs Claude Opus 5.5](/compare/claude-fable-5-1-vs-claude-opus-5-5)
- [Qwen3.5 Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-qwen3-5-flash)

## Explore More

- [Claude Fable 5.1 profile](/models/claude-fable-5-1)
- [Qwen3.5 Flash profile](/models/qwen3-5-flash)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)