# BTL-4 vs Claude Fable 5

> Side-by-side benchmark comparison for BTL-4 and Claude Fable 5 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/btl-4-vs-claude-fable
- Last updated: September 24, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Evidence is too thin for a benchmark verdict: BTL-4 and Claude Fable 5 share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- BTL-4 has the lower published output-token price.
- Claude Fable 5 has the larger published context window at 1M+.

## Model Snapshot

| Property | BTL-4 | Claude Fable 5 |
|----------|----------|----------|
| Creator | Bad Theory Labs | Anthropic |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 1M+ |
| Independent public score (not head-to-head) | null | 79.07 |
| Benchmarks Covered | 3 | 21 |
| Pricing (input/output) | $0.00 / $0.00 | $10.00 / $50.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- BTL-4 public-lane score: Coming soon
- Claude Fable 5 public-lane score: 73.7 (Supported · #4/105)

| Benchmark | BTL-4 | Claude Fable 5 | Winner |
|-----------|-----------|-----------|--------|
| BFCL v4 | 73.5% | Coming soon | Coming soon |
| Terminal-Bench 3.0 | Coming soon | 34.0% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 84.3% | Coming soon |
| OSWorld-Verified | Coming soon | 85% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 80.5% | Coming soon |
| ApprenticeBench | Coming soon | 34% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- BTL-4 public-lane score: Coming soon
- Claude Fable 5 public-lane score: 74.5 (Supported · #4/135)

| Benchmark | BTL-4 | Claude Fable 5 | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 78.4% | 95% | Claude Fable 5 |
| LiveCodeBench v6 | 66.1% | Coming soon | Coming soon |
| SWE-bench Pro | Coming soon | 80% | Coming soon |
| FrontierSWE v2 | Coming soon | 47.0% | Coming soon |
| FrontierCode 1.1 Main | Coming soon | 53.5% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 84.3% | Coming soon |
| cursorBench31 | Coming soon | 70.6% | Coming soon |
| cursorBench32 | Coming soon | 70.5% | Coming soon |
| VulcanBench v3 | Coming soon | 89.5% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 89.8% | Coming soon |
| SWE-bench (Vals) | Coming soon | 95.0% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- BTL-4 public-lane score: Coming soon
- Claude Fable 5 public-lane score: 80.6 (Unranked · 4 rankable rows)

| Benchmark | BTL-4 | Claude Fable 5 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-1 | Coming soon | 98.50% | Coming soon |
| ARC-AGI-2 | Coming soon | 89.2% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- BTL-4 public-lane score: Coming soon
- Claude Fable 5 public-lane score: 62.6 (Unranked · 2 rankable rows)

| Benchmark | BTL-4 | Claude Fable 5 | Winner |
|-----------|-----------|-----------|--------|
| Blueprint-Bench 2 | Coming soon | 38.6% | Coming soon |
| OfficeQA Pro | Coming soon | 57.9% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- BTL-4 public-lane score: Coming soon
- Claude Fable 5 public-lane score: 81.8 (Supported · #4/158)

| Benchmark | BTL-4 | Claude Fable 5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | Coming soon | 93.2% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 91.5% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- BTL-4 public-lane score: Coming soon
- Claude Fable 5 public-lane score: 75.7 (#58/124)

## FAQ

### Is there enough evidence to pick between BTL-4 and Claude Fable 5?

Not yet. The models share only 1 sourced benchmark row, 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

- [BTL-4 vs BTL-3](/compare/btl-3-vs-btl-4)
- [Claude Fable 5 vs BTL-3](/compare/btl-3-vs-claude-fable)
- [BTL-4 vs BTL-4 Compact](/compare/btl-4-vs-btl-4-compact)
- [Claude Fable 5 vs BTL-4 Compact](/compare/btl-4-compact-vs-claude-fable)

## Explore More

- [BTL-4 profile](/models/btl-4)
- [Claude Fable 5 profile](/models/claude-fable)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)