# A.X K2 vs Sakana Fugu

> Side-by-side benchmark comparison for A.X K2 and Sakana Fugu across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/a-x-k2-vs-sakana-fugu
- Last updated: September 10, 2026

- Shared sourced benchmarks: 3
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: A.X K2 and Sakana Fugu share only 3 sourced benchmark rows.

## Summary

- Only 3 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 | A.X K2 | Sakana Fugu |
|----------|----------|----------|
| Creator | SK Telecom | Sakana AI |
| Type | Open Weight | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 262K | 1M |
| Independent public score (not head-to-head) | null | null |
| Benchmarks Covered | 10 | 11 |
| Pricing (input/output) | $0.00 / $0.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- Sakana Fugu public-lane score: Coming soon

| Benchmark | A.X K2 | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 36.0% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 80.2% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- Sakana Fugu public-lane score: Coming soon

| Benchmark | A.X K2 | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench v6 | 84.0% | 92.9% | Sakana Fugu |
| SciCode | 41% | 60.1% | Sakana Fugu |
| Terminal-Bench 2.1 | 36.0% | Coming soon | Coming soon |
| SWE-bench Pro | Coming soon | 59% | Coming soon |
| Terminal-Bench 2.0 | Coming soon | 80.2% | Coming soon |
| LiveCodeBench Pro | Coming soon | 87.8% | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- Sakana Fugu public-lane score: 68.8 (Unranked · 1 rankable row)

| Benchmark | A.X K2 | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | Coming soon | 85.1% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- Sakana Fugu public-lane score: 69.5 (Unranked · 1 rankable row)

| Benchmark | A.X K2 | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| MRCRv2 | Coming soon | 86.6% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- Sakana Fugu public-lane score: Coming soon

| Benchmark | A.X K2 | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| HLE | 27.8% | Coming soon | Coming soon |
| GPQA-D | 85.6% | 95.5% | Sakana Fugu |
| GPQA | Coming soon | 95.5% | Coming soon |
| HLE w/o tools | Coming soon | 47.2% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- Sakana Fugu public-lane score: Coming soon

| Benchmark | A.X K2 | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| IFBench | 75.9% | Coming soon | Coming soon |

### Mathematics

- Winner: Insufficient shared evidence
- A.X K2 public-lane score: Coming soon
- Sakana Fugu public-lane score: Coming soon

| Benchmark | A.X K2 | Sakana Fugu | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 97.1% | Coming soon | Coming soon |
| Apex | 45.8% | Coming soon | Coming soon |
| Apex Shortlist | 88.6% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between A.X K2 and Sakana Fugu?

Not yet. The models share only 3 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

- [A.X K2 vs A.X series](/compare/a-x-k2-vs-skt-ax)
- [Sakana Fugu vs A.X series](/compare/sakana-fugu-vs-skt-ax)
- [A.X K2 vs Sakana Fugu-Ultra](/compare/a-x-k2-vs-sakana-fugu-ultra)
- [Sakana Fugu vs Sakana Fugu-Ultra](/compare/sakana-fugu-vs-sakana-fugu-ultra)

## Explore More

- [A.X K2 profile](/models/a-x-k2)
- [Sakana Fugu profile](/models/sakana-fugu)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)