# Claude Fable 5.1 vs Claude Opus 4.7 (Adaptive)

> Side-by-side benchmark comparison for Claude Fable 5.1 and Claude Opus 4.7 (Adaptive) across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-fable-5-1-vs-claude-opus-4-7-adaptive
- Last updated: October 17, 2026

- Shared sourced benchmarks: 5
- 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 68.96. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in reasoning, where the averages are 85.2 for Claude Fable 5.1 and 57.4 for Claude Opus 4.7 (Adaptive).
- The biggest single benchmark swing is OSWorld 2.0 in Agentic, with scores of 41.7% and 18.2%.
- Claude Opus 4.7 (Adaptive) 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 4.7 (Adaptive) |
|----------|----------|----------|
| Creator | Anthropic | Anthropic |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 83.18 | 68.96 |
| Benchmarks Covered | 33 | 21 |
| 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 4.7 (Adaptive) public-lane score: 59.4 (Supported · #28/128)

| Benchmark | Claude Fable 5.1 | Claude Opus 4.7 (Adaptive) | 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% | 18.2% | 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% | 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 |
| Terminal-Bench 2.0 | Coming soon | 69.4% | Coming soon |
| BrowseComp | Coming soon | 79.3% | Coming soon |
| MCP Atlas | Coming soon | 77.3% | Coming soon |
| OSWorld-Verified | Coming soon | 78% | Coming soon |
| CyberGym | Coming soon | 73.1% | Coming soon |
| JobBench | Coming soon | 45.9% | Coming soon |

### Coding

- Winner: Directional only
- Claude Fable 5.1 public-lane score: 76.8 (Supported · #3/150)
- Claude Opus 4.7 (Adaptive) public-lane score: 55.7 (Estimated · #31/150)

| Benchmark | Claude Fable 5.1 | Claude Opus 4.7 (Adaptive) | Winner |
|-----------|-----------|-----------|--------|
| Bug Hunt Bench | 43.0 fixes | Coming soon | Coming soon |
| SWE-bench Pro | 81.2% | 64.3% | 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 | 87.6% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 69.4% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: 85.2 (#4/28)
- Claude Opus 4.7 (Adaptive) public-lane score: 57.4 (Unranked · 3 rankable rows)

| Benchmark | Claude Fable 5.1 | Claude Opus 4.7 (Adaptive) | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | 97.50% | Coming soon | Coming soon |
| ARC-AGI-2 | 90% | 75.8% | Claude Fable 5.1 |
| GraphWalks BFS 256K–1M | 65.0% | Coming soon | Coming soon |
| MRCR v2 128K-256K | Coming soon | 59.2% | Coming soon |
| ARC-AGI-3 | Coming soon | 0.2% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: Coming soon
- Claude Opus 4.7 (Adaptive) public-lane score: 53.7 (#46/54)

| Benchmark | Claude Fable 5.1 | Claude Opus 4.7 (Adaptive) | Winner |
|-----------|-----------|-----------|--------|
| OfficeQA Pro | Coming soon | 43.6% | Coming soon |
| CharXiv | Coming soon | 91% | Coming soon |
| CharXiv w/o tools | Coming soon | 82.1% | Coming soon |

### Knowledge

- Winner: Directional only
- Claude Fable 5.1 public-lane score: 86.9 (Supported · #2/184)
- Claude Opus 4.7 (Adaptive) public-lane score: 66.4 (Estimated · #29/184)

| Benchmark | Claude Fable 5.1 | Claude Opus 4.7 (Adaptive) | Winner |
|-----------|-----------|-----------|--------|
| HLE | 65% | 54.7% | Claude Fable 5.1 |
| HLE w/o tools | 60.9% | 46.9% | 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 | 94.2% | Coming soon |
| GPQA-D | Coming soon | 94.2% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: Coming soon
- Claude Opus 4.7 (Adaptive) public-lane score: Coming soon

| Benchmark | Claude Fable 5.1 | Claude Opus 4.7 (Adaptive) | 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 4.7 (Adaptive) public-lane score: Coming soon

| Benchmark | Claude Fable 5.1 | Claude Opus 4.7 (Adaptive) | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 90.175% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 87.805% | Coming soon | Coming soon |
| FrontierMath (legacy) | Coming soon | 43.8% | Coming soon |

## FAQ

### Which is better overall, Claude Fable 5.1 or Claude Opus 4.7 (Adaptive)?

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 Claude Opus 4.7 (Adaptive)?

The widest category gap is in reasoning, where the averages are 85.2 for Claude Fable 5.1 and 57.4 for Claude Opus 4.7 (Adaptive).

### 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 4.7 (Adaptive) cover on BenchLM?

Claude Opus 4.7 (Adaptive) currently has 21 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 4.7 (Adaptive) vs Claude Fable 5](/compare/claude-fable-vs-claude-opus-4-7-adaptive)
- [Claude Fable 5.1 vs Claude Opus 4.7](/compare/claude-fable-5-1-vs-claude-opus-4-7)
- [Claude Opus 4.7 (Adaptive) vs Claude Opus 4.7](/compare/claude-opus-4-7-vs-claude-opus-4-7-adaptive)

## Explore More

- [Claude Fable 5.1 profile](/models/claude-fable-5-1)
- [Claude Opus 4.7 (Adaptive) profile](/models/claude-opus-4-7-adaptive)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)