# GPT-5.4 vs Sakana Fugu-Ultra

> Side-by-side benchmark comparison for GPT-5.4 and Sakana Fugu-Ultra across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-4-vs-sakana-fugu-ultra
- Last updated: September 28, 2026

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick Sakana Fugu-Ultra if you want the stronger benchmark profile. GPT-5.4 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 68.42.
- The clearest category separation is in reasoning, where the averages are 60.6 for GPT-5.4 and 79.1 for Sakana Fugu-Ultra.
- The biggest single benchmark swing is SWE-bench Pro in Coding, with scores of 57.7% and 73.7%.
- Sakana Fugu-Ultra is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.4 also has the larger context window at 1.05M.

## Model Snapshot

| Property | GPT-5.4 | Sakana Fugu-Ultra |
|----------|----------|----------|
| Creator | OpenAI | Sakana AI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1.05M | 1M |
| Overall Score | 68.42 | null |
| Benchmarks Covered | 38 | 11 |
| Pricing (input/output) | $2.50 / $15.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Not comparable
- GPT-5.4 public-lane score: 47.8 (Supported · #41/117)
- Sakana Fugu-Ultra public-lane score: Coming soon

| Benchmark | GPT-5.4 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 75.1% | Coming soon | Coming soon |
| CyberGym | 79.0% | Coming soon | Coming soon |
| BrowseComp | 82.7% | Coming soon | Coming soon |
| OSWorld-Verified | 75% | Coming soon | Coming soon |
| MCP Atlas | 70.6% | Coming soon | Coming soon |
| Toolathlon | 54.6% | Coming soon | Coming soon |
| τ²-bench results | 98.9% | Coming soon | Coming soon |
| Claw-Eval | 60.3% | Coming soon | Coming soon |
| DeepSearchQA | 73.6% | Coming soon | Coming soon |
| Gert Labs | 64.89% | Coming soon | Coming soon |
| ResearchClawBench | 15.3% | Coming soon | Coming soon |
| JobBench | 38.9% | Coming soon | Coming soon |
| ExploitGym | 6.0% | Coming soon | Coming soon |
| ApprenticeBench | 11% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 82.1% | Coming soon |

### Coding

- Winner: Not comparable
- GPT-5.4 public-lane score: 49.6 (Supported · #40/142)
- Sakana Fugu-Ultra public-lane score: Coming soon

| Benchmark | GPT-5.4 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| LiveCodeBench Pro | 87.5% | 90.8% | Sakana Fugu-Ultra |
| SWE-bench Pro | 57.7% | 73.7% | Sakana Fugu-Ultra |
| React Native Evals | 85.3% | Coming soon | Coming soon |
| Vibe Code Bench | 67.42% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 82.1% | Coming soon |
| LiveCodeBench v6 | Coming soon | 93.2% | Coming soon |
| SciCode | Coming soon | 58.7% | Coming soon |

### Reasoning

- Winner: Not comparable
- GPT-5.4 public-lane score: 60.6 (#21/27)
- Sakana Fugu-Ultra public-lane score: 79.1 (Unranked · 1 rankable row)

| Benchmark | GPT-5.4 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 74.0% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.2% | Coming soon | Coming soon |
| MRCRv2 | Coming soon | 93.6% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- GPT-5.4 public-lane score: 69.3 (#21/50)
- Sakana Fugu-Ultra public-lane score: 73.6 (Unranked · 1 rankable row)

| Benchmark | GPT-5.4 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 81.2% | Coming soon | Coming soon |
| OfficeQA Pro | 53.2% | Coming soon | Coming soon |
| MMMU-Pro w/ Python | 82.1% | Coming soon | Coming soon |
| CharXiv | 82.8% | 86.6% | Sakana Fugu-Ultra |
| ERQA | 65.4% | Coming soon | Coming soon |
| SimpleVQA | 61.1% | Coming soon | Coming soon |
| ScreenSpot Pro | 85.4% | Coming soon | Coming soon |
| ZeroBench | 41.0% | Coming soon | Coming soon |
| MedXpertQA (MM) | 77.1% | Coming soon | Coming soon |

### Knowledge

- Winner: Not comparable
- GPT-5.4 public-lane score: 66.7 (Supported · #19/168)
- Sakana Fugu-Ultra public-lane score: Coming soon

| Benchmark | GPT-5.4 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.8% | 95.5% | Sakana Fugu-Ultra |
| HLE | 52.1% | Coming soon | Coming soon |
| HLE w/o tools | 39.8% | 50% | Sakana Fugu-Ultra |
| GPQA-D | 92.8% | 95.5% | Sakana Fugu-Ultra |
| HealthBench Hard | 40.1% | Coming soon | Coming soon |
| MedXpertQA (Text) | 59.6% | Coming soon | Coming soon |
| HealthBench Professional | 48.1% | Coming soon | Coming soon |

### Instruction Following

- Winner: Not comparable
- GPT-5.4 public-lane score: 89.2 (#19/124)
- Sakana Fugu-Ultra public-lane score: Coming soon

### Mathematics

- Winner: Not comparable
- GPT-5.4 public-lane score: 64.4 (Unranked · 2 rankable rows)
- Sakana Fugu-Ultra public-lane score: Coming soon

| Benchmark | GPT-5.4 | Sakana Fugu-Ultra | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 47.600% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 27.100% | Coming soon | Coming soon |

## FAQ

### Which is better overall, GPT-5.4 or Sakana Fugu-Ultra?

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

### Where is the biggest gap between GPT-5.4 and Sakana Fugu-Ultra?

The widest category gap is in reasoning, where the averages are 60.6 for GPT-5.4 and 79.1 for Sakana Fugu-Ultra.

### How many benchmarks does GPT-5.4 cover on BenchLM?

GPT-5.4 currently has 38 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

- [GPT-5.4 vs GPT-5.4 Pro](/compare/gpt-5-4-vs-gpt-5-4-pro)
- [Sakana Fugu-Ultra vs GPT-5.4 Pro](/compare/gpt-5-4-pro-vs-sakana-fugu-ultra)
- [GPT-5.4 vs GPT-5.4 mini](/compare/gpt-5-4-vs-gpt-5-4-mini)
- [Sakana Fugu-Ultra vs GPT-5.4 mini](/compare/gpt-5-4-mini-vs-sakana-fugu-ultra)

## Explore More

- [GPT-5.4 profile](/models/gpt-5-4)
- [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)