# Claude Fable 5 vs Inkling

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

- Canonical page: https://benchlm.ai/compare/claude-fable-vs-inkling
- Last updated: October 14, 2026

- Shared sourced benchmarks: 12
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Claude Fable 5 if you want the stronger benchmark profile. Inkling 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 80.9 to 52.13.
- The clearest category separation is in agentic, where the averages are 74.8 for Claude Fable 5 and 36.2 for Inkling.
- The biggest single benchmark swing is FrontierMath v2 (Tier 4) in Mathematics, with scores of 90.200% and 4.878%.
- Inkling is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Claude Fable 5 | Inkling |
|----------|----------|----------|
| Creator | Anthropic | Thinking Machines Lab |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Hybrid |
| Context | 1M+ | 1M |
| Overall Score | 80.9 | 52.13 |
| Benchmarks Covered | 23 | 24 |
| Pricing (input/output) | $10.00 / $50.00 | $1.87 / $4.68 |

## Category Breakdown

### Agentic

- Winner: Claude Fable 5
- Claude Fable 5 public-lane score: 74.8 (Supported · #4/124)
- Inkling public-lane score: 36.2 (Supported · #72/124)

| Benchmark | Claude Fable 5 | Inkling | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 34.0% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 84.3% | 63.8% | Claude Fable 5 |
| OSWorld-Verified | 85% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 80.5% | 47.6% | Claude Fable 5 |
| ApprenticeBench | 34% | Coming soon | Coming soon |
| BrowseComp | Coming soon | 77.1% | Coming soon |
| MCP Atlas | Coming soon | 74.1% | Coming soon |
| CWE-bench v1 | Coming soon | 37.0% | Coming soon |

### Coding

- Winner: Claude Fable 5
- Claude Fable 5 public-lane score: 71.4 (Supported · #7/149)
- Inkling public-lane score: 34 (Supported · #80/149)

| Benchmark | Claude Fable 5 | Inkling | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 95% | 77.6% | Claude Fable 5 |
| SWE-bench Pro | 80% | 54.3% | Claude Fable 5 |
| FrontierSWE v2 | 47.0% | 4.1% | Claude Fable 5 |
| FrontierCode 1.1 Main | 53.5% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 84.3% | 63.8% | Claude Fable 5 |
| cursorBench31 | 70.6% | Coming soon | Coming soon |
| CursorBench 3.2 | 70.5% | Coming soon | Coming soon |
| VulcanBench v3 | 89.5% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 89.8% | 85.5% | Claude Fable 5 |
| SWE-bench (Vals) | 95.0% | 77.6% | Claude Fable 5 |

### Reasoning

- Winner: Not comparable
- Claude Fable 5 public-lane score: 84.3 (Unranked · 4 rankable rows)
- Inkling public-lane score: 79 (#14/29)

| Benchmark | Claude Fable 5 | Inkling | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | 98.50% | Coming soon | Coming soon |
| ARC-AGI-2 | 89.2% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Claude Fable 5 public-lane score: 66 (Unranked · 2 rankable rows)
- Inkling public-lane score: 67.5 (#35/54)

| Benchmark | Claude Fable 5 | Inkling | Winner |
|-----------|-----------|-----------|--------|
| Blueprint-Bench 2 | 38.6% | Coming soon | Coming soon |
| OfficeQA Pro | 57.9% | Coming soon | Coming soon |
| MMMU-Pro | Coming soon | 73.5% | Coming soon |
| CharXiv | Coming soon | 82% | Coming soon |
| CharXiv w/o tools | Coming soon | 78.1% | Coming soon |

### Knowledge

- Winner: Claude Fable 5
- Claude Fable 5 public-lane score: 82 (Supported · #6/181)
- Inkling public-lane score: 54.5 (Supported · #62/181)

| Benchmark | Claude Fable 5 | Inkling | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 93.2% | 87.1% | Claude Fable 5 |
| MMLU-Pro (Vals) | 91.5% | 86.3% | Claude Fable 5 |
| GPQA | Coming soon | 87.9% | Coming soon |
| GPQA-D | Coming soon | 87.9% | Coming soon |
| HLE | Coming soon | 46% | Coming soon |
| HLE w/o tools | Coming soon | 30% | Coming soon |

### Instruction Following

- Winner: Directional only
- Claude Fable 5 public-lane score: 77.1 (#59/128)
- Inkling public-lane score: 87.6 (#35/128)

| Benchmark | Claude Fable 5 | Inkling | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 79.8% | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Fable 5 public-lane score: 96 (Unranked · 2 rankable rows)
- Inkling public-lane score: 58.3 (#11/12)

| Benchmark | Claude Fable 5 | Inkling | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 87.018% | 33.333% | Claude Fable 5 |
| FrontierMath v2 (Tier 4) | 90.200% | 4.878% | Claude Fable 5 |
| AIME26 | Coming soon | 97.1% | Coming soon |

## FAQ

### Which is better overall, Claude Fable 5 or Inkling?

Claude Fable 5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Claude Fable 5 and Inkling?

The widest category gap is in agentic, where the averages are 74.8 for Claude Fable 5 and 36.2 for Inkling.

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

Claude Fable 5 currently has 23 sourced benchmark scores on BenchLM.

### How many benchmarks does Inkling cover on BenchLM?

Inkling currently has 24 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Fable 5 vs Claude Fable 5.1](/compare/claude-fable-vs-claude-fable-5-1)
- [Inkling vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-inkling)
- [Claude Fable 5 vs Inkling-Small](/compare/claude-fable-vs-inkling-small)
- [Inkling vs Inkling-Small](/compare/inkling-vs-inkling-small)

## Explore More

- [Claude Fable 5 profile](/models/claude-fable)
- [Inkling profile](/models/inkling)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)