# Claude Fable 5.1 vs Claude Opus 4.6

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

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

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Claude Fable 5.1 if you want the stronger benchmark profile. Claude Opus 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 62.39.
- The clearest category separation is in agentic, where the averages are 80.9 for Claude Fable 5.1 and 45.7 for Claude Opus 4.6.
- The biggest single benchmark swing is ApprenticeBench in Agentic, with scores of 72% and 5%.
- Claude Opus 4.6 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 | Claude Opus 4.6 |
|----------|----------|----------|
| Creator | Anthropic | Anthropic |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 1M | 1M |
| Overall Score | 83.18 | 62.39 |
| Benchmarks Covered | 33 | 36 |
| Pricing (input/output) | $10.00 / $50.00 | $5.00 / $25.00 |

## Category Breakdown

### Agentic

- Winner: Claude Fable 5.1
- Claude Fable 5.1 public-lane score: 80.9 (Supported · #2/128)
- Claude Opus 4.6 public-lane score: 45.7 (Supported · #57/128)

| Benchmark | Claude Fable 5.1 | Claude Opus 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% | 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% | 5% | Claude Fable 5.1 |
| CWE-bench v1 | 58.0% | Coming soon | Coming soon |
| MazeBench | 10% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 65.4% | Coming soon |
| BrowseComp | Coming soon | 83.7% | Coming soon |
| OSWorld-Verified | Coming soon | 72.7% | Coming soon |
| AndroidWorld | Coming soon | 62.0% | Coming soon |
| Claw-Eval | Coming soon | 70.4% | Coming soon |
| DeepSearchQA | Coming soon | 73.7% | Coming soon |
| CyberGym | Coming soon | 66.6% | Coming soon |
| Gert Labs | Coming soon | 61.85% | Coming soon |
| ResearchClawBench | Coming soon | 19.9% | Coming soon |
| JobBench | Coming soon | 36.7% | Coming soon |

### Coding

- Winner: Claude Fable 5.1
- Claude Fable 5.1 public-lane score: 76.8 (Supported · #3/150)
- Claude Opus 4.6 public-lane score: 46.1 (Supported · #52/150)

| Benchmark | Claude Fable 5.1 | Claude Opus 4.6 | Winner |
|-----------|-----------|-----------|--------|
| Bug Hunt Bench | 43.0 fixes | Coming soon | Coming soon |
| SWE-bench Pro | 81.2% | 53.4% | Claude Fable 5.1 |
| 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% | Coming soon | Coming soon |
| CursorBench 4.0 | 51.8% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 40.2% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 80.8% | Coming soon |
| SWE-bench Verified* | Coming soon | 75.6% | Coming soon |
| LiveCodeBench Pro | Coming soon | 70.7% | Coming soon |
| SWE-Rebench | Coming soon | 65.3% | Coming soon |
| React Native Evals | Coming soon | 84.1% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 65.4% | Coming soon |
| Vibe Code Bench | Coming soon | 57.57% | Coming soon |
| FrontierCode 1.1 Main | Coming soon | 26.9% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: 85.2 (#4/28)
- Claude Opus 4.6 public-lane score: 71.9 (Unranked · 2 rankable rows)

| Benchmark | Claude Fable 5.1 | Claude Opus 4.6 | 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
- Claude Opus 4.6 public-lane score: 74.5 (#25/54)

| Benchmark | Claude Fable 5.1 | Claude Opus 4.6 | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | Coming soon | 77.3% | Coming soon |
| ERQA | Coming soon | 51.6% | Coming soon |
| ScreenSpot Pro | Coming soon | 83.1% | Coming soon |
| MedXpertQA (MM) | Coming soon | 64.8% | Coming soon |

### Knowledge

- Winner: Directional only
- Claude Fable 5.1 public-lane score: 86.9 (Supported · #2/184)
- Claude Opus 4.6 public-lane score: 59 (Estimated · #52/184)

| Benchmark | Claude Fable 5.1 | Claude Opus 4.6 | Winner |
|-----------|-----------|-----------|--------|
| HLE | 65% | 53% | Claude Fable 5.1 |
| HLE w/o tools | 60.9% | 40% | 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 | 91.3% | Coming soon |
| GPQA-D | Coming soon | 89.2% | Coming soon |
| SuperGPQA | Coming soon | 95% | Coming soon |
| MMLU-Pro | Coming soon | 82% | Coming soon |
| MMLU-Pro (Arcee) | Coming soon | 89.1% | Coming soon |
| HealthBench Hard | Coming soon | 14.8% | Coming soon |
| MedXpertQA (Text) | Coming soon | 52.1% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: Coming soon
- Claude Opus 4.6 public-lane score: 52.4 (#87/148)

| Benchmark | Claude Fable 5.1 | Claude Opus 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 Opus 4.6 public-lane score: 69.1 (Unranked · 3 rankable rows)

| Benchmark | Claude Fable 5.1 | Claude Opus 4.6 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 90.175% | 65.965% | Claude Fable 5.1 |
| FrontierMath v2 (Tier 4) | 87.805% | 26.829% | Claude Fable 5.1 |
| AIME25 (Arcee) | Coming soon | 99.8% | Coming soon |

## FAQ

### Which is better overall, Claude Fable 5.1 or Claude Opus 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 Opus 4.6?

The widest category gap is in agentic, where the averages are 80.9 for Claude Fable 5.1 and 45.7 for Claude Opus 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 Opus 4.6 cover on BenchLM?

Claude Opus 4.6 currently has 36 sourced benchmark scores on BenchLM.

## Related Comparisons

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

## Explore More

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