# classifier.dev (fast) vs Claude Fable 5.1

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

- Canonical page: https://benchlm.ai/compare/classifier-dev-fast-vs-claude-fable-5-1
- Last updated: October 1, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for classifier.dev (fast) and Claude Fable 5.1.

## Summary

- classifier.dev (fast) and Claude Fable 5.1 do not currently share a sourced benchmark row. The mirror therefore compares metadata, pricing, context windows, and each model's separately reported coverage without naming a benchmark winner.

## Model Snapshot

| Property | classifier.dev (fast) | Claude Fable 5.1 |
|----------|----------|----------|
| Creator | classifier.dev | Anthropic |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | null | 1M |
| Independent public score (not head-to-head) | null | 82.82 |
| Benchmarks Covered | 2 | 30 |
| Pricing (input/output) | Pricing unavailable / Pricing unavailable | $10.00 / $50.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- classifier.dev (fast) public-lane score: Coming soon
- Claude Fable 5.1 public-lane score: 78.9 (Supported · #2/119)

| Benchmark | classifier.dev (fast) | Claude Fable 5.1 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 4.0 | Coming soon | 55.80% | Coming soon |
| Terminal-Bench-Science 0.1 | Coming soon | 52.6% | Coming soon |
| OSWorld 2.0 | Coming soon | 41.7% | Coming soon |
| AutomationBench | Coming soon | 31.4% | Coming soon |
| Toolathlon-Verified | Coming soon | 77.8% | Coming soon |
| Toolathlon Verified Pass@3 | Coming soon | 81.5% | Coming soon |
| Toolathlon Verified Pass³ | Coming soon | 73.1% | Coming soon |
| Toolathlon Verified avg. turns | Coming soon | 23.7 turns | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 85.0% | Coming soon |
| ApprenticeBench | Coming soon | 72% | Coming soon |
| CWE-bench v1 | Coming soon | 58.0% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- classifier.dev (fast) public-lane score: Coming soon
- Claude Fable 5.1 public-lane score: 79.8 (Supported · #3/144)

| Benchmark | classifier.dev (fast) | Claude Fable 5.1 | Winner |
|-----------|-----------|-----------|--------|
| Bug Hunt Bench | Coming soon | 43 fixes | Coming soon |
| SWE-bench Pro | Coming soon | 81.2% | Coming soon |
| SWE Multilingual | Coming soon | 89.1% | Coming soon |
| SWE Multimodal | Coming soon | 54.7% | Coming soon |
| DeepSWE | Coming soon | 67.4% | Coming soon |
| FrontierSWE v2 | Coming soon | 56.3% | Coming soon |
| ProgramBench | Coming soon | 87.6% | Coming soon |
| CursorBench 3.2 | Coming soon | 73.4% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 90.5% | Coming soon |
| CursorBench 4.0 | Coming soon | 51.8% | Coming soon |
| PostTrainBench v1.1 | Coming soon | 40.2% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- classifier.dev (fast) public-lane score: Coming soon
- Claude Fable 5.1 public-lane score: 81.4 (#3/27)

| Benchmark | classifier.dev (fast) | Claude Fable 5.1 | Winner |
|-----------|-----------|-----------|--------|
| JevBench 1.4 | 70.82 | Coming soon | Coming soon |
| JevBench 1.5 | 74.66 | Coming soon | Coming soon |
| ARC-AGI-1 | Coming soon | 97.50% | Coming soon |
| ARC-AGI-2 | Coming soon | 90% | Coming soon |
| GraphWalks BFS 256K–1M | Coming soon | 65.0% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- classifier.dev (fast) public-lane score: Coming soon
- Claude Fable 5.1 public-lane score: 84.9 (Supported · #3/170)

| Benchmark | classifier.dev (fast) | Claude Fable 5.1 | Winner |
|-----------|-----------|-----------|--------|
| HLE | Coming soon | 65% | Coming soon |
| HLE w/o tools | Coming soon | 60.9% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 93.4% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 92.4% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- classifier.dev (fast) public-lane score: Coming soon
- Claude Fable 5.1 public-lane score: Coming soon

| Benchmark | classifier.dev (fast) | Claude Fable 5.1 | Winner |
|-----------|-----------|-----------|--------|
| Gray Swan IPI (15 attempts) | Coming soon | 1.0% | Coming soon |

## FAQ

### Can I compare classifier.dev (fast) and Claude Fable 5.1 on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but sourced benchmark coverage is still incomplete for a fair score-level comparison.

### Why does this page show "coming soon" values?

BenchLM only calls winners when public benchmark coverage is available on both sides of the comparison.

## Related Comparisons

- [classifier.dev (fast) vs Claude Fable 5](/compare/classifier-dev-fast-vs-claude-fable)
- [Claude Fable 5.1 vs Claude Fable 5](/compare/claude-fable-vs-claude-fable-5-1)
- [classifier.dev (fast) vs GPT-6 Astra](/compare/classifier-dev-fast-vs-gpt-6-astra)
- [Claude Fable 5.1 vs GPT-6 Astra](/compare/claude-fable-5-1-vs-gpt-6-astra)

## Explore More

- [classifier.dev (fast) profile](/models/classifier-dev-fast)
- [Claude Fable 5.1 profile](/models/claude-fable-5-1)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)