# Claude Fable 5.1 vs Gemini 2.5 Pro

> Side-by-side benchmark comparison for Claude Fable 5.1 and Gemini 2.5 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-fable-5-1-vs-gemini-2-5-pro
- Last updated: October 17, 2026

- Shared sourced benchmarks: 3
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Evidence is too thin for a benchmark verdict: Claude Fable 5.1 and Gemini 2.5 Pro share only 3 sourced benchmark rows.

## Summary

- Only 3 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Gemini 2.5 Pro has the lower published output-token price.

## Model Snapshot

| Property | Claude Fable 5.1 | Gemini 2.5 Pro |
|----------|----------|----------|
| Creator | Anthropic | Google |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 1M | 1M |
| Independent public score (not head-to-head) | 83.18 | 49.14 |
| Benchmarks Covered | 33 | 9 |
| Pricing (input/output) | $10.00 / $50.00 | $1.25 / $10.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Claude Fable 5.1 public-lane score: 80.9 (Supported · #2/128)
- Gemini 2.5 Pro public-lane score: 25.7 (Estimated · #102/128)

| Benchmark | Claude Fable 5.1 | Gemini 2.5 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% | 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 |
| Gert Labs | Coming soon | 42.01% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Claude Fable 5.1 public-lane score: 76.8 (Supported · #3/150)
- Gemini 2.5 Pro public-lane score: 22.3 (Supported · #115/150)

| Benchmark | Claude Fable 5.1 | Gemini 2.5 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% | 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 | 63.8% | Coming soon |
| Vibe Code Bench | Coming soon | 0.40% | Coming soon |
| SWE-bench (Vals) | Coming soon | 54.4% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Claude Fable 5.1 public-lane score: 85.2 (#4/28)
- Gemini 2.5 Pro public-lane score: 73.3 (Unranked · 2 rankable rows)

| Benchmark | Claude Fable 5.1 | Gemini 2.5 Pro | 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: Insufficient shared evidence
- Claude Fable 5.1 public-lane score: Coming soon
- Gemini 2.5 Pro public-lane score: 74.8 (Unranked · 1 rankable row)

### Knowledge

- Winner: Insufficient shared evidence
- Claude Fable 5.1 public-lane score: 86.9 (Supported · #2/184)
- Gemini 2.5 Pro public-lane score: 45.6 (Supported · #96/184)

| Benchmark | Claude Fable 5.1 | Gemini 2.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| HLE | 65% | 18.8% | Claude Fable 5.1 |
| HLE w/o tools | 60.9% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 93.4% | Coming soon | Coming soon |
| MMLU-Pro (Vals) | 92.4% | Coming soon | Coming soon |
| GPQA | Coming soon | 83% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Claude Fable 5.1 public-lane score: Coming soon
- Gemini 2.5 Pro public-lane score: 57.8 (#83/148)

| Benchmark | Claude Fable 5.1 | Gemini 2.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | 1.0% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- Claude Fable 5.1 public-lane score: 96.8 (Unranked · 2 rankable rows)
- Gemini 2.5 Pro public-lane score: 36.9 (Unranked · 3 rankable rows)

| Benchmark | Claude Fable 5.1 | Gemini 2.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 90.175% | 24.561% | Claude Fable 5.1 |
| FrontierMath v2 (Tier 4) | 87.805% | 0.000% | Claude Fable 5.1 |
| AIME 2024 | Coming soon | 92% | Coming soon |

## FAQ

### Is there enough evidence to pick between Claude Fable 5.1 and Gemini 2.5 Pro?

Not yet. The models share only 3 sourced benchmark rows, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Claude Fable 5.1 vs Claude Fable 5](/compare/claude-fable-vs-claude-fable-5-1)
- [Gemini 2.5 Pro vs Claude Fable 5](/compare/claude-fable-vs-gemini-2-5-pro)
- [Claude Fable 5.1 vs Claude Opus 5.5](/compare/claude-fable-5-1-vs-claude-opus-5-5)
- [Gemini 2.5 Pro vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gemini-2-5-pro)

## Explore More

- [Claude Fable 5.1 profile](/models/claude-fable-5-1)
- [Gemini 2.5 Pro profile](/models/gemini-2-5-pro)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)