# Claude Fable 5.1 vs Claude Sonnet 4.6

> Side-by-side benchmark comparison for Claude Fable 5.1 and Claude Sonnet 4.6 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-fable-5-1-vs-claude-sonnet-4-6
- Last updated: October 17, 2026

- Shared sourced benchmarks: 10
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Claude Fable 5.1 if you want the stronger benchmark profile. Claude Sonnet 4.6 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 83.18 to 55.89.
- The clearest category separation is in agentic, where the averages are 80.9 for Claude Fable 5.1 and 46.3 for Claude Sonnet 4.6.
- The biggest single benchmark swing is ApprenticeBench in Agentic, with scores of 72% and 2%.
- Claude Sonnet 4.6 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 | Claude Sonnet 4.6 |
|----------|----------|----------|
| Creator | Anthropic | Anthropic |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 1M | 200K |
| Overall Score | 83.18 | 55.89 |
| Benchmarks Covered | 33 | 28 |
| Pricing (input/output) | $10.00 / $50.00 | $3.00 / $15.00 |

## Category Breakdown

### Agentic

- Winner: Claude Fable 5.1
- Claude Fable 5.1 public-lane score: 80.9 (Supported · #2/128)
- Claude Sonnet 4.6 public-lane score: 46.3 (Supported · #55/128)

| Benchmark | Claude Fable 5.1 | Claude Sonnet 4.6 | 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% | 8.3% | Claude Fable 5.1 |
| 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% | 57.3% | Claude Fable 5.1 |
| ApprenticeBench | 72% | 2% | Claude Fable 5.1 |
| CWE-bench v1 | 58.0% | Coming soon | Coming soon |
| MazeBench | 10% | 0% | Claude Fable 5.1 |
| Terminal-Bench 2.0 | Coming soon | 59.1% | Coming soon |
| OSWorld-Verified | Coming soon | 72.1% | Coming soon |
| Claw-Eval | Coming soon | 67.8% | Coming soon |
| CyberGym | Coming soon | 65.2% | Coming soon |
| Gert Labs | Coming soon | 62.92% | Coming soon |
| JobBench | Coming soon | 36.9% | Coming soon |

### Coding

- Winner: Claude Fable 5.1
- Claude Fable 5.1 public-lane score: 76.8 (Supported · #3/150)
- Claude Sonnet 4.6 public-lane score: 44.7 (Supported · #54/150)

| Benchmark | Claude Fable 5.1 | Claude Sonnet 4.6 | 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% | 82.1% | Claude Fable 5.1 |
| CursorBench 4.0 | 51.8% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 40.2% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 79.6% | Coming soon |
| SWE-Rebench | Coming soon | 60.7% | Coming soon |
| React Native Evals | Coming soon | 80.6% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 59.1% | Coming soon |
| Vibe Code Bench | Coming soon | 51.48% | Coming soon |
| cursorBench31 | Coming soon | 48.8% | Coming soon |
| FrontierCode 1.1 Main | Coming soon | 24.3% | Coming soon |
| SWE-bench (Vals) | Coming soon | 77.4% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: 85.2 (#4/28)
- Claude Sonnet 4.6 public-lane score: 62.8 (Unranked · 4 rankable rows)

| Benchmark | Claude Fable 5.1 | Claude Sonnet 4.6 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | 97.50% | 86.00% | Claude Fable 5.1 |
| ARC-AGI-2 | 90% | 58.3% | Claude Fable 5.1 |
| GraphWalks BFS 256K–1M | 65.0% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: Coming soon
- Claude Sonnet 4.6 public-lane score: 58.7 (#45/54)

| Benchmark | Claude Fable 5.1 | Claude Sonnet 4.6 | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | Coming soon | 77.4% | Coming soon |

### Knowledge

- Winner: Claude Fable 5.1
- Claude Fable 5.1 public-lane score: 86.9 (Supported · #2/184)
- Claude Sonnet 4.6 public-lane score: 55.4 (Supported · #58/184)

| Benchmark | Claude Fable 5.1 | Claude Sonnet 4.6 | Winner |
|-----------|-----------|-----------|--------|
| HLE | 65% | 49% | Claude Fable 5.1 |
| HLE w/o tools | 60.9% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 93.4% | 85.6% | Claude Fable 5.1 |
| MMLU-Pro (Vals) | 92.4% | 87.3% | Claude Fable 5.1 |
| GPQA | Coming soon | 89.9% | Coming soon |
| SuperGPQA | Coming soon | 95% | Coming soon |
| MMLU-Pro | Coming soon | 79.2% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: Coming soon
- Claude Sonnet 4.6 public-lane score: 48 (#99/148)

| Benchmark | Claude Fable 5.1 | Claude Sonnet 4.6 | 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)
- Claude Sonnet 4.6 public-lane score: Coming soon

| Benchmark | Claude Fable 5.1 | Claude Sonnet 4.6 | 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 Claude Sonnet 4.6?

Claude Fable 5.1 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Fable 5.1 and Claude Sonnet 4.6?

The widest category gap is in agentic, where the averages are 80.9 for Claude Fable 5.1 and 46.3 for Claude Sonnet 4.6.

### 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 Claude Sonnet 4.6 cover on BenchLM?

Claude Sonnet 4.6 currently has 28 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Fable 5.1 vs Claude Fable 5](/compare/claude-fable-vs-claude-fable-5-1)
- [Claude Sonnet 4.6 vs Claude Fable 5](/compare/claude-fable-vs-claude-sonnet-4-6)
- [Claude Fable 5.1 vs Claude Opus 5.5](/compare/claude-fable-5-1-vs-claude-opus-5-5)
- [Claude Sonnet 4.6 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-claude-sonnet-4-6)

## Explore More

- [Claude Fable 5.1 profile](/models/claude-fable-5-1)
- [Claude Sonnet 4.6 profile](/models/claude-sonnet-4-6)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)