# BTL-4 vs Fish Audio S2.1 Pro

> Side-by-side benchmark comparison for BTL-4 and Fish Audio S2.1 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/btl-4-vs-fish-audio-s2-1-pro
- Last updated: September 21, 2026

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

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for BTL-4 and Fish Audio S2.1 Pro.

## Summary

- BTL-4 and Fish Audio S2.1 Pro 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 | BTL-4 | Fish Audio S2.1 Pro |
|----------|----------|----------|
| Creator | Bad Theory Labs | Fish Audio |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 262K | N/A |
| Independent public score (not head-to-head) | null | null |
| Benchmarks Covered | 3 | 0 |
| Pricing (input/output) | $0.00 / $0.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- BTL-4 public-lane score: 50.5 (Estimated · #50/154)
- Fish Audio S2.1 Pro public-lane score: Coming soon

| Benchmark | BTL-4 | Fish Audio S2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| BFCL v4 | 73.5% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- BTL-4 public-lane score: 50.4 (Estimated · #62/156)
- Fish Audio S2.1 Pro public-lane score: Coming soon

| Benchmark | BTL-4 | Fish Audio S2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 78.4% | Coming soon | Coming soon |
| LiveCodeBench v6 | 66.1% | Coming soon | Coming soon |

## FAQ

### Can I compare BTL-4 and Fish Audio S2.1 Pro 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

- [BTL-4 vs BTL-3](/compare/btl-3-vs-btl-4)
- [Fish Audio S2.1 Pro vs BTL-3](/compare/btl-3-vs-fish-audio-s2-1-pro)
- [BTL-4 vs BTL-4 Compact](/compare/btl-4-vs-btl-4-compact)
- [Fish Audio S2.1 Pro vs BTL-4 Compact](/compare/btl-4-compact-vs-fish-audio-s2-1-pro)

## Explore More

- [BTL-4 profile](/models/btl-4)
- [Fish Audio S2.1 Pro profile](/models/fish-audio-s2-1-pro)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)