# Claude Fable 5.1 vs Gemini 3.1 Pro

> Side-by-side benchmark comparison for Claude Fable 5.1 and Gemini 3.1 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-fable-5-1-vs-gemini-3-1-pro
- Last updated: October 17, 2026

- Shared sourced benchmarks: 10
- 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 64.7. Conditional score ranges do not establish rank confidence.
- The clearest category separation is in agentic, where the averages are 80.9 for Claude Fable 5.1 and 38.4 for Gemini 3.1 Pro.
- The biggest single benchmark swing is FrontierMath v2 (Tier 4) in Mathematics, with scores of 87.805% and 26.829%.
- Gemini 3.1 Pro 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 | Gemini 3.1 Pro |
|----------|----------|----------|
| Creator | Anthropic | Google |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 83.18 | 64.7 |
| Benchmarks Covered | 33 | 30 |
| Pricing (input/output) | $10.00 / $50.00 | $2.00 / $12.00 |

## Category Breakdown

### Agentic

- Winner: Claude Fable 5.1
- Claude Fable 5.1 public-lane score: 80.9 (Supported · #2/128)
- Gemini 3.1 Pro public-lane score: 38.4 (Supported · #70/128)

| Benchmark | Claude Fable 5.1 | Gemini 3.1 Pro | 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% | 70.8% | Claude Fable 5.1 |
| ApprenticeBench | 72% | Coming soon | Coming soon |
| CWE-bench v1 | 58.0% | Coming soon | Coming soon |
| MazeBench | 10% | 1% | Claude Fable 5.1 |
| Claw-Eval | Coming soon | 57.8% | Coming soon |
| DeepSearchQA | Coming soon | 69.7% | Coming soon |
| τ²-bench results | Coming soon | 95.6% | Coming soon |
| Gert Labs | Coming soon | 56.87% | Coming soon |
| ResearchClawBench | Coming soon | 13.3% | Coming soon |

### Coding

- Winner: Claude Fable 5.1
- Claude Fable 5.1 public-lane score: 76.8 (Supported · #3/150)
- Gemini 3.1 Pro public-lane score: 39.2 (Supported · #67/150)

| Benchmark | Claude Fable 5.1 | Gemini 3.1 Pro | 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% | 88.5% | Claude Fable 5.1 |
| CursorBench 4.0 | 51.8% | Coming soon | Coming soon |
| PostTrainBench v1.1 | 40.2% | 22.0% | Claude Fable 5.1 |
| LiveCodeBench Pro | Coming soon | 82.9% | Coming soon |
| React Native Evals | Coming soon | 78.9% | Coming soon |
| Vibe Code Bench | Coming soon | 32.03% | Coming soon |
| SWE-bench (Vals) | Coming soon | 78.8% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: 85.2 (#4/28)
- Gemini 3.1 Pro public-lane score: 58.2 (Unranked · 2 rankable rows)

| Benchmark | Claude Fable 5.1 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | 97.50% | Coming soon | Coming soon |
| ARC-AGI-2 | 90% | 77.1% | Claude Fable 5.1 |
| GraphWalks BFS 256K–1M | 65.0% | Coming soon | Coming soon |
| ARC-AGI-3 | Coming soon | 0.4% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: Coming soon
- Gemini 3.1 Pro public-lane score: 80.1 (#17/54)

| Benchmark | Claude Fable 5.1 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | Coming soon | 83.9% | Coming soon |
| CharXiv | Coming soon | 80.2% | Coming soon |
| ERQA | Coming soon | 69.4% | Coming soon |
| SimpleVQA | Coming soon | 72.4% | Coming soon |
| ScreenSpot Pro | Coming soon | 84.4% | Coming soon |
| ZeroBench | Coming soon | 29.0% | Coming soon |
| MedXpertQA (MM) | Coming soon | 81.3% | Coming soon |

### Knowledge

- Winner: Claude Fable 5.1
- Claude Fable 5.1 public-lane score: 86.9 (Supported · #2/184)
- Gemini 3.1 Pro public-lane score: 67.6 (Supported · #26/184)

| Benchmark | Claude Fable 5.1 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| HLE | 65% | Coming soon | Coming soon |
| HLE w/o tools | 60.9% | 45.4% | Claude Fable 5.1 |
| GPQA Diamond (Vals) | 93.4% | 95.5% | Gemini 3.1 Pro |
| MMLU-Pro (Vals) | 92.4% | 91.0% | Claude Fable 5.1 |
| GPQA-D | Coming soon | 94.3% | Coming soon |
| HealthBench Hard | Coming soon | 20.6% | Coming soon |
| MedXpertQA (Text) | Coming soon | 71.5% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Claude Fable 5.1 public-lane score: Coming soon
- Gemini 3.1 Pro public-lane score: Coming soon

| Benchmark | Claude Fable 5.1 | Gemini 3.1 Pro | 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)
- Gemini 3.1 Pro public-lane score: 65 (Unranked · 2 rankable rows)

| Benchmark | Claude Fable 5.1 | Gemini 3.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 90.175% | 59.649% | Claude Fable 5.1 |
| FrontierMath v2 (Tier 4) | 87.805% | 26.829% | Claude Fable 5.1 |

## FAQ

### Which is better overall, Claude Fable 5.1 or Gemini 3.1 Pro?

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 Gemini 3.1 Pro?

The widest category gap is in agentic, where the averages are 80.9 for Claude Fable 5.1 and 38.4 for Gemini 3.1 Pro.

### 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 Gemini 3.1 Pro cover on BenchLM?

Gemini 3.1 Pro currently has 30 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Fable 5.1 vs Claude Fable 5](/compare/claude-fable-vs-claude-fable-5-1)
- [Gemini 3.1 Pro vs Claude Fable 5](/compare/claude-fable-vs-gemini-3-1-pro)
- [Claude Fable 5.1 vs Claude Opus 5.5](/compare/claude-fable-5-1-vs-claude-opus-5-5)
- [Gemini 3.1 Pro vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gemini-3-1-pro)

## Explore More

- [Claude Fable 5.1 profile](/models/claude-fable-5-1)
- [Gemini 3.1 Pro profile](/models/gemini-3-1-pro)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)