# Claude Fable 5 vs GPT-5.6 Sol

> Side-by-side benchmark comparison for Claude Fable 5 and GPT-5.6 Sol across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-fable-vs-gpt-5-6-sol
- Last updated: September 24, 2026

- Shared sourced benchmarks: 14
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Claude Fable 5 if you want the stronger benchmark profile. GPT-5.6 Sol only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Claude Fable 5 leads overall 79.07 to 78.49.
- The clearest category separation is in multimodal & grounded, where the averages are 62.6 for Claude Fable 5 and 87.6 for GPT-5.6 Sol.
- The biggest single benchmark swing is SWE-bench Pro in Coding, with scores of 80% and 64.6%.
- GPT-5.6 Sol is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.6 Sol also has the larger context window at 1.05M.

## Model Snapshot

| Property | Claude Fable 5 | GPT-5.6 Sol |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M+ | 1.05M |
| Overall Score | 79.07 | 78.49 |
| Benchmarks Covered | 21 | 37 |
| Pricing (input/output) | $10.00 / $50.00 | $4.00 / $20.00 |

## Category Breakdown

### Agentic

- Winner: Claude Fable 5
- Claude Fable 5 public-lane score: 73.7 (Supported · #4/105)
- GPT-5.6 Sol public-lane score: 69.6 (Supported · #7/105)

| Benchmark | Claude Fable 5 | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 34.0% | 34.6% | GPT-5.6 Sol |
| Terminal-Bench 2.1 | 84.3% | 91.9% | GPT-5.6 Sol |
| OSWorld-Verified | 85% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 80.5% | 85.8% | GPT-5.6 Sol |
| ApprenticeBench | 34% | 26% | Claude Fable 5 |
| BrowseComp | Coming soon | 92.2% | Coming soon |
| OSWorld 2.0 | Coming soon | 62.6% | Coming soon |
| CyberGym | Coming soon | 84.5% | Coming soon |
| ExploitGym | Coming soon | 33.7% | Coming soon |
| Toolathlon | Coming soon | 58% | Coming soon |

### Coding

- Winner: Claude Fable 5
- Claude Fable 5 public-lane score: 74.5 (Supported · #4/135)
- GPT-5.6 Sol public-lane score: 71.6 (Supported · #6/135)

| Benchmark | Claude Fable 5 | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 95% | Coming soon | Coming soon |
| SWE-bench Pro | 80% | 64.6% | Claude Fable 5 |
| FrontierSWE v2 | 47.0% | 32.2% | Claude Fable 5 |
| FrontierCode 1.1 Main | 53.5% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 84.3% | 91.9% | GPT-5.6 Sol |
| cursorBench31 | 70.6% | Coming soon | Coming soon |
| cursorBench32 | 70.5% | 67.2% | Claude Fable 5 |
| VulcanBench v3 | 89.5% | 87.0% | Claude Fable 5 |
| LiveCodeBench (Vals) | 89.8% | 82.6% | Claude Fable 5 |
| SWE-bench (Vals) | 95.0% | 96.2% | GPT-5.6 Sol |
| Bug Hunt Bench | Coming soon | 42 fixes | Coming soon |
| DeepSWE | Coming soon | 72.7% | Coming soon |
| FrontierCode 1.1 Extended | Coming soon | 60.6% | Coming soon |
| VulcanBench CII v1 | Coming soon | 86.5% | Coming soon |
| cursorBench40 | Coming soon | 41.7% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Fable 5 public-lane score: 80.6 (Unranked · 4 rankable rows)
- GPT-5.6 Sol public-lane score: 72.1 (#8/19)

| Benchmark | Claude Fable 5 | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | 98.50% | Coming soon | Coming soon |
| ARC-AGI-2 | 89.2% | 92.5% | GPT-5.6 Sol |
| ARC-AGI-3 | Coming soon | 7.8% | Coming soon |
| GeneBench-Pro | Coming soon | 28.7% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Fable 5 public-lane score: 62.6 (Unranked · 2 rankable rows)
- GPT-5.6 Sol public-lane score: 87.6 (#5/50)

| Benchmark | Claude Fable 5 | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| Blueprint-Bench 2 | 38.6% | Coming soon | Coming soon |
| OfficeQA Pro | 57.9% | Coming soon | Coming soon |
| MMMU-Pro | Coming soon | 83% | Coming soon |
| MMMU-Pro w/ Python | Coming soon | 84.6% | Coming soon |

### Knowledge

- Winner: Claude Fable 5
- Claude Fable 5 public-lane score: 81.8 (Supported · #4/158)
- GPT-5.6 Sol public-lane score: 78.8 (Supported · #7/158)

| Benchmark | Claude Fable 5 | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 93.2% | 95.2% | GPT-5.6 Sol |
| MMLU-Pro (Vals) | 91.5% | 89.1% | Claude Fable 5 |
| GPQA | Coming soon | 94.6% | Coming soon |
| GPQA-D | Coming soon | 94.6% | Coming soon |
| HLE-Verified | Coming soon | 54.5% | Coming soon |
| LABBench2 | Coming soon | 82.1% | Coming soon |
| HealthBench Professional | Coming soon | 60.5% | Coming soon |
| HealthBench Hard | Coming soon | 33.1% | Coming soon |

### Instruction Following

- Winner: Directional only
- Claude Fable 5 public-lane score: 75.7 (#58/124)
- GPT-5.6 Sol public-lane score: 87.7 (#28/124)

### Mathematics

- Winner: Not comparable
- Claude Fable 5 public-lane score: Coming soon
- GPT-5.6 Sol public-lane score: 96.8 (Unranked · 3 rankable rows)

| Benchmark | Claude Fable 5 | GPT-5.6 Sol | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | Coming soon | 89% | Coming soon |
| FrontierMath v2 (Tiers 1-3) | Coming soon | 89.000% | Coming soon |
| FrontierMath v2 (Tier 4) | Coming soon | 83.000% | Coming soon |

## FAQ

### Which is better overall, Claude Fable 5 or GPT-5.6 Sol?

Claude Fable 5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Fable 5 and GPT-5.6 Sol?

The widest category gap is in multimodal & grounded, where the averages are 62.6 for Claude Fable 5 and 87.6 for GPT-5.6 Sol.

### How many benchmarks does Claude Fable 5 cover on BenchLM?

Claude Fable 5 currently has 21 sourced benchmark scores on BenchLM.

### How many benchmarks does GPT-5.6 Sol cover on BenchLM?

GPT-5.6 Sol currently has 37 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Fable 5 vs Claude Fable 5.1](/compare/claude-fable-vs-claude-fable-5-1)
- [GPT-5.6 Sol vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gpt-5-6-sol)
- [Claude Fable 5 vs GPT-5.6 Terra](/compare/claude-fable-vs-gpt-5-6-terra)
- [GPT-5.6 Sol vs GPT-5.6 Terra](/compare/gpt-5-6-sol-vs-gpt-5-6-terra)

## Explore More

- [Claude Fable 5 profile](/models/claude-fable)
- [GPT-5.6 Sol profile](/models/gpt-5-6-sol)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)