# Kimi K2.5 vs Sakana Fugu-Ultra

> Side-by-side benchmark comparison for Kimi K2.5 and Sakana Fugu-Ultra across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/kimi-k2-5-vs-sakana-fugu-ultra
- Last updated: September 28, 2026

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Sakana Fugu-Ultra if you want the stronger benchmark profile. Kimi K2.5 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Sakana Fugu-Ultra leads overall 74 to 52.94.
- The clearest category separation is in reasoning, where the averages are 55.2 for Kimi K2.5 and 79.1 for Sakana Fugu-Ultra.
- The biggest single benchmark swing is SWE-bench Pro in Coding, with scores of 50.7% and 73.7%.
- Sakana Fugu-Ultra is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Sakana Fugu-Ultra also has the larger context window at 1M.

## Model Snapshot

| Property | Kimi K2.5 | Sakana Fugu-Ultra |
|----------|----------|----------|
| Creator | Moonshot AI | Sakana AI |
| Type | Open Weight | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 256K | 1M |
| Overall Score | 52.94 | null |
| Benchmarks Covered | 45 | 11 |
| Pricing (input/output) | $0.60 / $3.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Not comparable
- Kimi K2.5 public-lane score: 36.3 (Estimated · #61/117)
- Sakana Fugu-Ultra public-lane score: Coming soon

| Benchmark | Kimi K2.5 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 50.8% | Coming soon | Coming soon |
| BrowseComp | 60.6% | Coming soon | Coming soon |
| Claw-Eval | 52.3% | Coming soon | Coming soon |
| QwenClawBench | 54.3% | Coming soon | Coming soon |
| τ³-bench results | 65.7% | Coming soon | Coming soon |
| DeepSearchQA | 77.1% | Coming soon | Coming soon |
| DeepPlanning | 14.4% | Coming soon | Coming soon |
| Toolathlon | 27.8% | Coming soon | Coming soon |
| MCP Atlas | 29.5% | Coming soon | Coming soon |
| MCP-Tasks | 59.1% | Coming soon | Coming soon |
| WideResearch | 72.7% | Coming soon | Coming soon |
| Gert Labs | 45.88% | Coming soon | Coming soon |
| ResearchClawBench | 14.0% | Coming soon | Coming soon |
| JobBench | 8.7% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 82.1% | Coming soon |

### Coding

- Winner: Not comparable
- Kimi K2.5 public-lane score: 38.6 (Estimated · #66/142)
- Sakana Fugu-Ultra public-lane score: Coming soon

| Benchmark | Kimi K2.5 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 76.8% | Coming soon | Coming soon |
| SWE-bench Verified* | 70.8% | Coming soon | Coming soon |
| LiveCodeBench v6 | 85.0% | 93.2% | Sakana Fugu-Ultra |
| SWE-bench Pro | 50.7% | 73.7% | Sakana Fugu-Ultra |
| SWE Multilingual | 73% | Coming soon | Coming soon |
| SWE-Rebench | 58.5% | Coming soon | Coming soon |
| React Native Evals | 77.2% | Coming soon | Coming soon |
| SciCode | 48.7% | 58.7% | Sakana Fugu-Ultra |
| Terminal-Bench 2.1 | Coming soon | 82.1% | Coming soon |
| LiveCodeBench Pro | Coming soon | 90.8% | Coming soon |

### Reasoning

- Winner: Not comparable
- Kimi K2.5 public-lane score: 55.2 (Unranked · 3 rankable rows)
- Sakana Fugu-Ultra public-lane score: 79.1 (Unranked · 1 rankable row)

| Benchmark | Kimi K2.5 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | 61% | Coming soon | Coming soon |
| MRCRv2 | Coming soon | 93.6% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Kimi K2.5 public-lane score: 66.8 (#25/50)
- Sakana Fugu-Ultra public-lane score: 73.6 (Unranked · 1 rankable row)

| Benchmark | Kimi K2.5 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 78.5% | Coming soon | Coming soon |
| Video-MME | 87.4% | Coming soon | Coming soon |
| MMVU | 80.4% | Coming soon | Coming soon |
| VideoMMMU | 86.6% | Coming soon | Coming soon |
| CharXiv | Coming soon | 86.6% | Coming soon |

### Knowledge

- Winner: Not comparable
- Kimi K2.5 public-lane score: 47.9 (Estimated · #70/168)
- Sakana Fugu-Ultra public-lane score: Coming soon

| Benchmark | Kimi K2.5 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 87.6% | 95.5% | Sakana Fugu-Ultra |
| GPQA-D | 87.6% | 95.5% | Sakana Fugu-Ultra |
| SuperGPQA | 69.2% | Coming soon | Coming soon |
| MMLU-Pro | 87.1% | Coming soon | Coming soon |
| MMLU-Pro (Arcee) | 87.1% | Coming soon | Coming soon |
| HLE | 30.1% | Coming soon | Coming soon |
| HLE w/o tools | Coming soon | 50% | Coming soon |

### Multilingual

- Winner: Not comparable
- Kimi K2.5 public-lane score: 38.2 (#8/12)
- Sakana Fugu-Ultra public-lane score: Coming soon

| Benchmark | Kimi K2.5 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | 82.3% | Coming soon | Coming soon |
| NOVA-63 | 56.0% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- Kimi K2.5 public-lane score: 84.4 (#41/124)
- Sakana Fugu-Ultra public-lane score: Coming soon

| Benchmark | Kimi K2.5 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 93.9% | Coming soon | Coming soon |

### Mathematics

- Winner: Not comparable
- Kimi K2.5 public-lane score: 62.1 (#4/7)
- Sakana Fugu-Ultra public-lane score: Coming soon

| Benchmark | Kimi K2.5 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| AIME 2025 | 96.1% | Coming soon | Coming soon |
| AIME26 | 95.8% | Coming soon | Coming soon |
| AIME25 (Arcee) | 96.3% | Coming soon | Coming soon |
| HMMT Feb 2025 | 95.4% | Coming soon | Coming soon |
| HMMT Nov 2025 | 91.1% | Coming soon | Coming soon |
| HMMT Feb 2026 | 87.1% | Coming soon | Coming soon |
| MMAnswerBench | 81.8% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 27.900% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 4.200% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Kimi K2.5 or Sakana Fugu-Ultra?

Sakana Fugu-Ultra is ahead overall on BenchLM right now.

### Where is the biggest gap between Kimi K2.5 and Sakana Fugu-Ultra?

The widest category gap is in reasoning, where the averages are 55.2 for Kimi K2.5 and 79.1 for Sakana Fugu-Ultra.

### How many benchmarks does Kimi K2.5 cover on BenchLM?

Kimi K2.5 currently has 45 sourced benchmark scores on BenchLM.

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

Sakana Fugu-Ultra currently has 11 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Kimi K2.5 vs Kimi K2.5 (Reasoning)](/compare/kimi-k2-5-vs-kimi-k2-5-reasoning)
- [Sakana Fugu-Ultra vs Kimi K2.5 (Reasoning)](/compare/kimi-k2-5-reasoning-vs-sakana-fugu-ultra)
- [Kimi K2.5 vs Sakana Fugu](/compare/kimi-k2-5-vs-sakana-fugu)
- [Sakana Fugu-Ultra vs Sakana Fugu](/compare/sakana-fugu-vs-sakana-fugu-ultra)

## Explore More

- [Kimi K2.5 profile](/models/kimi-k2-5)
- [Sakana Fugu-Ultra profile](/models/sakana-fugu-ultra)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)