# Mellum2.1-12B-A2.5B-Thinking vs Sakana Fugu

> Side-by-side benchmark comparison for Mellum2.1-12B-A2.5B-Thinking and Sakana Fugu across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/mellum2-1-12b-a2-5b-thinking-vs-sakana-fugu
- Last updated: October 8, 2026

- Shared sourced benchmarks: 4
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Sakana Fugu if you want the stronger benchmark profile. Mellum2.1-12B-A2.5B-Thinking only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Sakana Fugu leads overall 67 to 37.
- The biggest single benchmark swing is Terminal-Bench 2.1 in Agentic, with scores of 17.4% and 80.2%.
- Sakana Fugu is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Sakana Fugu also has the larger context window at 1M.

## Model Snapshot

| Property | Mellum2.1-12B-A2.5B-Thinking | Sakana Fugu |
|----------|----------|----------|
| Creator | JetBrains | Sakana AI |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 128K | 1M |
| Overall Score | null | null |
| Benchmarks Covered | 7 | 11 |
| Pricing (input/output) | $0.00 / $0.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- Sakana Fugu public-lane score: Coming soon

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 17.4% | 80.2% | Sakana Fugu |

### Coding

- Winner: Not comparable
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- Sakana Fugu public-lane score: Coming soon

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench v6 | 82.0% | 92.9% | Sakana Fugu |
| SWE-bench Verified | 47% | Coming soon | Coming soon |
| SWE-bench Pro | 28% | 59% | Sakana Fugu |
| Terminal-Bench 2.1 | Coming soon | 80.2% | Coming soon |
| LiveCodeBench Pro | Coming soon | 87.8% | Coming soon |
| SciCode | Coming soon | 60.1% | Coming soon |

### Reasoning

- Winner: Not comparable
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- Sakana Fugu public-lane score: 70.7 (Unranked · 1 rankable row)

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| MRCRv2 | Coming soon | 86.6% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- Sakana Fugu public-lane score: 69.6 (Unranked · 1 rankable row)

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | Coming soon | 85.1% | Coming soon |

### Knowledge

- Winner: Not comparable
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- Sakana Fugu public-lane score: Coming soon

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| MMLU-Redux | 87.8% | Coming soon | Coming soon |
| GPQA-D | 64.6% | 95.5% | Sakana Fugu |
| GPQA | Coming soon | 95.5% | Coming soon |
| HLE w/o tools | Coming soon | 47.2% | Coming soon |

### Instruction Following

- Winner: Not comparable
- Mellum2.1-12B-A2.5B-Thinking public-lane score: Coming soon
- Sakana Fugu public-lane score: Coming soon

| Benchmark | Mellum2.1-12B-A2.5B-Thinking | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 90.6% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Mellum2.1-12B-A2.5B-Thinking or Sakana Fugu?

Sakana Fugu is ahead overall on BenchLM right now.

### How many benchmarks does Mellum2.1-12B-A2.5B-Thinking cover on BenchLM?

Mellum2.1-12B-A2.5B-Thinking currently has 7 sourced benchmark scores on BenchLM.

### How many benchmarks does Sakana Fugu cover on BenchLM?

Sakana Fugu currently has 11 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Mellum2.1-12B-A2.5B-Thinking vs Sakana Fugu-Ultra](/compare/mellum2-1-12b-a2-5b-thinking-vs-sakana-fugu-ultra)
- [Sakana Fugu vs Sakana Fugu-Ultra](/compare/sakana-fugu-vs-sakana-fugu-ultra)
- [Mellum2.1-12B-A2.5B-Thinking vs Fugu Cyber](/compare/mellum2-1-12b-a2-5b-thinking-vs-sakana-fugu-cyber)
- [Sakana Fugu vs Fugu Cyber](/compare/sakana-fugu-vs-sakana-fugu-cyber)

## Explore More

- [Mellum2.1-12B-A2.5B-Thinking profile](/models/mellum2-1-12b-a2-5b-thinking)
- [Sakana Fugu profile](/models/sakana-fugu)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)