# Decision 4B v1.2 vs Fish Audio S2.1 Pro

> Side-by-side benchmark comparison for Decision 4B v1.2 and Fish Audio S2.1 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/decision-4b-v12-vs-fish-audio-s2-1-pro
- 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 Decision 4B v1.2 and Fish Audio S2.1 Pro.

## Summary

- Decision 4B v1.2 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 | Decision 4B v1.2 | Fish Audio S2.1 Pro |
|----------|----------|----------|
| Creator | FlyMy.AI | Fish Audio |
| Type | Unknown | Proprietary |
| Reasoning | Non-Reasoning | Non-Reasoning |
| Context | null | N/A |
| Independent public score (not head-to-head) | null | null |
| Benchmarks Covered | 1 | 0 |
| Pricing (input/output) | Pricing unavailable / Pricing unavailable | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Reasoning

- Winner: Insufficient shared evidence
- Decision 4B v1.2 public-lane score: Coming soon
- Fish Audio S2.1 Pro public-lane score: Coming soon

| Benchmark | Decision 4B v1.2 | Fish Audio S2.1 Pro | Winner |
|-----------|-----------|-----------|--------|
| JevBench 1.5 | 70.83 | Coming soon | Coming soon |

## FAQ

### Can I compare Decision 4B v1.2 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

- [Decision 4B v1.2 vs GPT-6 Astra](/compare/decision-4b-v12-vs-gpt-6-astra)
- [Fish Audio S2.1 Pro vs GPT-6 Astra](/compare/fish-audio-s2-1-pro-vs-gpt-6-astra)
- [Decision 4B v1.2 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-decision-4b-v12)
- [Fish Audio S2.1 Pro vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-fish-audio-s2-1-pro)

## Explore More

- [Decision 4B v1.2 profile](/models/decision-4b-v12)
- [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)