# Mercury 2.5 vs Sakana Fugu

> Side-by-side benchmark comparison for Mercury 2.5 and Sakana Fugu across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/mercury-2-5-vs-sakana-fugu
- Last updated: September 8, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: Mercury 2.5 and Sakana Fugu share only 2 sourced benchmark rows.

## Summary

- Only 2 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Sakana Fugu has the lower published output-token price.
- Sakana Fugu has the larger published context window at 1M.

## Model Snapshot

| Property | Mercury 2.5 | Sakana Fugu |
|----------|----------|----------|
| Creator | Inception | Sakana AI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 260K | 1M |
| Independent public score (not head-to-head) | null | null |
| Benchmarks Covered | 5 | 11 |
| Pricing (input/output) | $0.04 / $0.15 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Mercury 2.5 public-lane score: 44.5 (Estimated · #91/152)
- Sakana Fugu public-lane score: Coming soon

| Benchmark | Mercury 2.5 | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| τ³-bench results | 96.0% | Coming soon | Coming soon |
| DeepSearchQA | 34.0% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 80.2% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Mercury 2.5 public-lane score: 47.8 (Estimated · #73/151)
- Sakana Fugu public-lane score: Coming soon

| Benchmark | Mercury 2.5 | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| SciCode | 38% | 60.1% | Sakana Fugu |
| SWE-bench Pro | Coming soon | 59% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 80.2% | Coming soon |
| LiveCodeBench v6 | Coming soon | 92.9% | Coming soon |
| LiveCodeBench Pro | Coming soon | 87.8% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Mercury 2.5 public-lane score: Coming soon
- Sakana Fugu public-lane score: 68.8 (Unranked · 1 rankable row)

| Benchmark | Mercury 2.5 | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | Coming soon | 85.1% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Mercury 2.5 public-lane score: 67.7 (Unranked · 1 rankable row)
- Sakana Fugu public-lane score: 69.5 (Unranked · 1 rankable row)

| Benchmark | Mercury 2.5 | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| MRCRv2 | Coming soon | 86.6% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Mercury 2.5 public-lane score: 48.3 (Estimated · #94/182)
- Sakana Fugu public-lane score: Coming soon

| Benchmark | Mercury 2.5 | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 79.0% | 95.5% | Sakana Fugu |
| GPQA | Coming soon | 95.5% | Coming soon |
| HLE w/o tools | Coming soon | 47.2% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Mercury 2.5 public-lane score: 80.1 (#53/121)
- Sakana Fugu public-lane score: Coming soon

| Benchmark | Mercury 2.5 | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| IFBench | 77% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between Mercury 2.5 and Sakana Fugu?

Not yet. The models share only 2 sourced benchmark rows, 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

- [Mercury 2.5 vs Mercury 2.5 Preview](/compare/mercury-2-5-vs-mercury-2-5-preview)
- [Sakana Fugu vs Mercury 2.5 Preview](/compare/mercury-2-5-preview-vs-sakana-fugu)
- [Mercury 2.5 vs Sakana Fugu-Ultra](/compare/mercury-2-5-vs-sakana-fugu-ultra)
- [Sakana Fugu vs Sakana Fugu-Ultra](/compare/sakana-fugu-vs-sakana-fugu-ultra)

## Explore More

- [Mercury 2.5 profile](/models/mercury-2-5)
- [Sakana Fugu profile](/models/sakana-fugu)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)