# Claude Fable 5.1 vs Qwen3.8-Flash-Next

> Side-by-side benchmark comparison for Claude Fable 5.1 and Qwen3.8-Flash-Next across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-fable-5-1-vs-qwen3-8-flash-next
- Last updated: October 17, 2026

- Shared sourced benchmarks: 7
- 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 62.8. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in knowledge, where the averages are 86.9 for Claude Fable 5.1 and 59.3 for Qwen3.8-Flash-Next.
- The biggest single benchmark swing is HLE in Knowledge, with scores of 65% and 35.9%.
- Qwen3.8-Flash-Next is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Claude Fable 5.1 also has the larger context window at 1M.

## Model Snapshot

| Property | Claude Fable 5.1 | Qwen3.8-Flash-Next |
|----------|----------|----------|
| Creator | Anthropic | Alibaba |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 262K |
| Overall Score | 83.18 | 62.8 |
| Benchmarks Covered | 33 | 24 |
| Pricing (input/output) | $10.00 / $50.00 | $0.00 / $0.00 |

## Category Breakdown

### Agentic

- Winner: Claude Fable 5.1
- Claude Fable 5.1 public-lane score: 80.9 (Supported · #2/128)
- Qwen3.8-Flash-Next public-lane score: 65.5 (Supported · #17/128)

| Benchmark | Claude Fable 5.1 | Qwen3.8-Flash-Next | 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% | 19.4% | Claude Fable 5.1 |
| AutomationBench | 31.4% | Coming soon | Coming soon |
| Toolathlon-Verified | 77.8% | 73.5% | Claude Fable 5.1 |
| 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 |
| CoWorkBench | Coming soon | 73.9% | Coming soon |
| JobBench | Coming soon | 55.7% | Coming soon |
| Agents' Last Exam | Coming soon | 51.2% | Coming soon |
| AndroidWorld | Coming soon | 84.5% | Coming soon |

### Coding

- Winner: Claude Fable 5.1
- Claude Fable 5.1 public-lane score: 76.8 (Supported · #3/150)
- Qwen3.8-Flash-Next public-lane score: 51.6 (Supported · #41/150)

| Benchmark | Claude Fable 5.1 | Qwen3.8-Flash-Next | Winner |
|-----------|-----------|-----------|--------|
| Bug Hunt Bench | 43.0 fixes | Coming soon | Coming soon |
| SWE-bench Pro | 81.2% | 62.5% | Claude Fable 5.1 |
| SWE Multilingual | 89.1% | 81% | Claude Fable 5.1 |
| SWE Multimodal | 54.7% | Coming soon | Coming soon |
| DeepSWE | 67.4% | 58.7% | Claude Fable 5.1 |
| 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% | Coming soon | Coming soon |
| CursorBench 4.0 | 51.8% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 40.2% | Coming soon | Coming soon |
| NL2Repo | Coming soon | 48.1% | Coming soon |
| LiveCodeBench v6 | Coming soon | 91.9% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: 85.2 (#4/28)
- Qwen3.8-Flash-Next public-lane score: 80.6 (Unranked · 2 rankable rows)

| Benchmark | Claude Fable 5.1 | Qwen3.8-Flash-Next | 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 |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: Coming soon
- Qwen3.8-Flash-Next public-lane score: 87.7 (#8/54)

| Benchmark | Claude Fable 5.1 | Qwen3.8-Flash-Next | Winner |
|-----------|-----------|-----------|--------|
| Vision2Web | Coming soon | 64.0% | Coming soon |
| ERQA | Coming soon | 72.3% | Coming soon |
| LVBench | Coming soon | 76.6% | Coming soon |
| RealWorldQA | Coming soon | 88.5% | Coming soon |
| MathVision | Coming soon | 90.6% | Coming soon |
| MathVision w/ Python | Coming soon | 95.7% | Coming soon |
| CharXiv w/o tools | Coming soon | 84.6% | Coming soon |
| CharXiv | Coming soon | 90.6% | Coming soon |

### Knowledge

- Winner: Claude Fable 5.1
- Claude Fable 5.1 public-lane score: 86.9 (Supported · #2/184)
- Qwen3.8-Flash-Next public-lane score: 59.3 (Supported · #51/184)

| Benchmark | Claude Fable 5.1 | Qwen3.8-Flash-Next | Winner |
|-----------|-----------|-----------|--------|
| HLE | 65% | 35.9% | Claude Fable 5.1 |
| HLE w/o tools | 60.9% | 35.9% | Claude Fable 5.1 |
| GPQA Diamond (Vals) | 93.4% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 92.4% | Coming soon | Coming soon |
| GPQA | Coming soon | 91.7% | Coming soon |
| GPQA-D | Coming soon | 91.7% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: Coming soon
- Qwen3.8-Flash-Next public-lane score: 91.2 (#22/148)

| Benchmark | Claude Fable 5.1 | Qwen3.8-Flash-Next | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | 1.0% | Coming soon | Coming soon |
| IFBench | Coming soon | 81.3% | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: 96.8 (Unranked · 2 rankable rows)
- Qwen3.8-Flash-Next public-lane score: Coming soon

| Benchmark | Claude Fable 5.1 | Qwen3.8-Flash-Next | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 90.175% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 87.805% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Claude Fable 5.1 or Qwen3.8-Flash-Next?

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 Qwen3.8-Flash-Next?

The widest category gap is in knowledge, where the averages are 86.9 for Claude Fable 5.1 and 59.3 for Qwen3.8-Flash-Next.

### 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 Qwen3.8-Flash-Next cover on BenchLM?

Qwen3.8-Flash-Next currently has 24 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Fable 5.1 vs Claude Fable 5](/compare/claude-fable-vs-claude-fable-5-1)
- [Qwen3.8-Flash-Next vs Claude Fable 5](/compare/claude-fable-vs-qwen3-8-flash-next)
- [Claude Fable 5.1 vs Claude Opus 5.5](/compare/claude-fable-5-1-vs-claude-opus-5-5)
- [Qwen3.8-Flash-Next vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-qwen3-8-flash-next)

## Explore More

- [Claude Fable 5.1 profile](/models/claude-fable-5-1)
- [Qwen3.8-Flash-Next profile](/models/qwen3-8-flash-next)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)