# Claude Fable 5.1 vs LongCat-2.5

> Side-by-side benchmark comparison for Claude Fable 5.1 and LongCat-2.5 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-fable-5-1-vs-longcat-2-5
- Last updated: November 9, 2026

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

## Quick Verdict

Pick Claude Fable 5.1 if you want the stronger benchmark profile. LongCat-2.5 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Claude Fable 5.1 leads overall 80.9 to 0.
- The biggest single benchmark swing is ProgramBench in Coding, with scores of 87.6% and 25.5%.
- LongCat-2.5 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 | LongCat-2.5 |
|----------|----------|----------|
| Creator | Anthropic | Meituan |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Hybrid |
| Context | 1M | 1M |
| Overall Score | 80.9 | null |
| Benchmarks Covered | 56 | 22 |
| Pricing (input/output) | $10.00 / $50.00 | $0.30 / $1.20 |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: 80.4 (Supported · #3/132)
- LongCat-2.5 public-lane score: Coming soon

| Benchmark | Claude Fable 5.1 | LongCat-2.5 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.1 | 57.60% | Coming soon | Coming soon |
| Terminal-Bench 4.0 | 55.80% | 38.50% | Claude Fable 5.1 |
| Terminal-Bench-Science 0.1 | 52.6% | Coming soon | Coming soon |
| OSWorld 2.0 | 41.7% | Coming soon | Coming soon |
| AutomationBench | 31.4% | 51.8% | LongCat-2.5 |
| 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 |
| OSWorld 2.1 | 80.7% | Coming soon | Coming soon |
| WANDR | 68.7% | Coming soon | Coming soon |
| RoboDojo Sim | 27.6% | Coming soon | Coming soon |
| Remote Labor Index | 17.9% | Coming soon | Coming soon |
| OSWorld 2.1 Offline | 83.5% | Coming soon | Coming soon |
| DRACO | 87.7% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 88.4% | Coming soon |
| BrowseComp | Coming soon | 91.9% | Coming soon |
| HLE w/ tools | Coming soon | 63.1% | Coming soon |
| Agents' Last Exam | Coming soon | 38.5% | Coming soon |
| MCP Atlas | Coming soon | 83.1% | Coming soon |
| JobBench | Coming soon | 65.4% | Coming soon |
| skillsBench | Coming soon | 63.3% | Coming soon |
| SpreadsheetBench 2 | Coming soon | 34.9% | Coming soon |
| Claw-Eval | Coming soon | 78.3% | Coming soon |

### Coding

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: 76.4 (Supported · #5/158)
- LongCat-2.5 public-lane score: Coming soon

| Benchmark | Claude Fable 5.1 | LongCat-2.5 | 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% | 64.6% | Claude Fable 5.1 |
| FrontierSWE v2 | 56.3% | Coming soon | Coming soon |
| ProgramBench | 87.6% | 25.5% | Claude Fable 5.1 |
| 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 |
| FrontierCode 2.0 | 32.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 88.4% | Coming soon |
| PaperBench | Coming soon | 82.1% | Coming soon |
| SWE-Atlas Codebase QnA | Coming soon | 58.3% | Coming soon |
| NL2Repo | Coming soon | 60.5% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: 76.8 (Supported · #6/157)
- LongCat-2.5 public-lane score: Coming soon

| Benchmark | Claude Fable 5.1 | LongCat-2.5 | 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 |
| STEM Professor Bench | 29.9% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: 81.1 (Estimated · #3/67)
- LongCat-2.5 public-lane score: Coming soon

| Benchmark | Claude Fable 5.1 | LongCat-2.5 | Winner |
|-----------|-----------|-----------|--------|
| ParseBench | 77.81% | Coming soon | Coming soon |
| Chartography (no tools) | 42.6% | Coming soon | Coming soon |
| Chartography (tools) | 86.2% | Coming soon | Coming soon |
| BenchCAD Vision2Code (no tools) | 0.437 | Coming soon | Coming soon |
| BenchCAD Vision2Code (tools) | 0.843 | Coming soon | Coming soon |
| GDP.pdf (no tools) | 85.4% | Coming soon | Coming soon |
| GDP.pdf (tools) | 85.1% | Coming soon | Coming soon |
| OfficeQA | 80.2% | Coming soon | Coming soon |
| OfficeQA Pro | 69% | Coming soon | Coming soon |
| BenchCAD 2.1 | 36.3% | Coming soon | Coming soon |
| BenchCAD 2.1 (tools) | 44.4% | Coming soon | Coming soon |
| Vision2Web | Coming soon | 78.6% | Coming soon |
| CharXiv | Coming soon | 90.2% | Coming soon |
| MathVision w/ Python | Coming soon | 96.5% | Coming soon |
| Video-MME | Coming soon | 85.2% | Coming soon |

### Knowledge

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: 84.6 (Supported · #3/179)
- LongCat-2.5 public-lane score: Coming soon

| Benchmark | Claude Fable 5.1 | LongCat-2.5 | Winner |
|-----------|-----------|-----------|--------|
| HLE | 65% | Coming soon | Coming soon |
| HLE w/o tools | 60.9% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 93.4% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 92.4% | Coming soon | Coming soon |
| PhysicianBench | 61.0% | Coming soon | Coming soon |
| FrontierScience | Coming soon | 77% | Coming soon |

### Multilingual

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: Coming soon
- LongCat-2.5 public-lane score: Coming soon

| Benchmark | Claude Fable 5.1 | LongCat-2.5 | Winner |
|-----------|-----------|-----------|--------|
| GMMLU | 94.0% | Coming soon | Coming soon |
| MILU | 93.0% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: Coming soon
- LongCat-2.5 public-lane score: Coming soon

| Benchmark | Claude Fable 5.1 | LongCat-2.5 | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | 1.0% | Coming soon | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: 93.3 (Unranked · 2 rankable rows)
- LongCat-2.5 public-lane score: Coming soon

| Benchmark | Claude Fable 5.1 | LongCat-2.5 | 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 LongCat-2.5?

Claude Fable 5.1 is ahead overall on BenchLM right now.

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

Claude Fable 5.1 currently has 56 sourced benchmark scores on BenchLM.

### How many benchmarks does LongCat-2.5 cover on BenchLM?

LongCat-2.5 currently has 22 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Fable 5.1 vs Claude Fable 5.2](/compare/claude-fable-5-1-vs-claude-fable-5-2)
- [LongCat-2.5 vs Claude Fable 5.2](/compare/claude-fable-5-2-vs-longcat-2-5)
- [Claude Fable 5.1 vs Claude Fable 5](/compare/claude-fable-vs-claude-fable-5-1)
- [LongCat-2.5 vs Claude Fable 5](/compare/claude-fable-vs-longcat-2-5)

## Explore More

- [Claude Fable 5.1 profile](/models/claude-fable-5-1)
- [LongCat-2.5 profile](/models/longcat-2-5)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)