Model comparison
GPT-4.1 nano vs Sakana Fugu-Ultra
Head-to-head evidence from 1 shared benchmark result across 1 category. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-4.1 nano #161 (Estimated); Sakana Fugu-Ultra unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-4.1 nano and Sakana Fugu-Ultra share 1 comparable benchmark result. 1 of 8 categories are comparable. 20 results are unique to GPT-4.1 nano; 10 to Sakana Fugu-Ultra.
Updated July 23, 2026- Shared results
- 1
- GPT-4.1 nano only
- 20
- Sakana Fugu-Ultra only
- 10
- Comparable categories
- 1 / 8
Treat this as a split decision. GPT-4.1 nano makes more sense if you would rather avoid the extra latency and token burn of a reasoning model; Sakana Fugu-Ultra is the better fit if knowledge is the priority or you want the stronger reasoning-first profile.
Confidence note. This is a partial-evidence comparison with 1 shared benchmark result across 1 evidence category; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
GPT-4.1 nano and Sakana Fugu-Ultra finish on the same BenchAlign overall score, so this is less about a single winner and more about where the edge shows up. The BenchAlign headline says tie; the benchmark table is where the real choice happens.
Sakana Fugu-Ultra is the reasoning model in the pair, while GPT-4.1 nano is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | GPT-4.1 nano | Δ | Sakana Fugu-Ultra |
|---|---|---|---|
| Knowledge | GPT-4.1 nano50.3 | Margin→ 45.2 | Sakana Fugu-Ultra95.5 |
| Agentic | GPT-4.1 nanoNot measured | MarginNo overlap | Sakana Fugu-Ultra82.1 |
| Coding | GPT-4.1 nanoNot measured | MarginNo overlap | Sakana Fugu-Ultra64.5 |
| Reasoning | GPT-4.1 nanoNot measured | MarginNo overlap | Sakana Fugu-Ultra93.6 |
| Math | GPT-4.1 nano1.0 | MarginNo overlap | Sakana Fugu-UltraNot measured |
| Multimodal | GPT-4.1 nanoNot measured | MarginNo overlap | Sakana Fugu-Ultra86.6 |
| Inst. Following | GPT-4.1 nano83.2 | MarginNo overlap | Sakana Fugu-UltraNot measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
GPQA
KnowledgeA 50.3%B 95.5%Winner: Sakana Fugu-UltraΔ 45.2GPQA: GPT-4.1 nano scored 50.3%; Sakana Fugu-Ultra scored 95.5%. Sakana Fugu-Ultra wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-4.1 nano | Sakana Fugu-Ultra | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-4.1 nano$0.1 input / $0.4 output | Sakana Fugu-UltraNot available | A complete price comparison is not available. |
| Generation speedtokens per second | GPT-4.1 nano181 tok/s | Sakana Fugu-UltraNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GPT-4.1 nano0.63 s | Sakana Fugu-UltraNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GPT-4.1 nano1M | Sakana Fugu-Ultra1M | Listed context windows are equal. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding7 benchmarks
| Benchmark | GPT-4.1 nano | Sakana Fugu-Ultra | Result |
|---|---|---|---|
| AA Coding IndexSource | 11.1% | — | Not comparable |
| AA-SciCodeSource | 25.9% | — | Not comparable |
| SWE-bench ProSource | — | 73.7% | Not comparable |
| Terminal-Bench 2.0Source | — | 82.1% | Not comparable |
| LiveCodeBench v6Source | — | 93.2% | Not comparable |
| LiveCodeBench ProSource | — | 90.8% | Not comparable |
| SciCodeSource | — | 58.7% | Not comparable |
Reasoning3 benchmarks
KnowledgeSakana Fugu-Ultra wins10 benchmarks
| Benchmark | GPT-4.1 nano | Sakana Fugu-Ultra | Result |
|---|---|---|---|
| MMLUSource | 80.1% | — | Not comparable |
| GPQASource | 50.3% | 95.5% | Sakana Fugu-Ultra leads |
| Artificial Analysis Intelligence IndexSource | 9.6% | — | Not comparable |
| AA-GPQA DiamondSource | 51.2% | — | Not comparable |
| AA-HLESource | 3.9% | — | Not comparable |
| AA-Omniscience IndexSource | -56.4% | — | Not comparable |
| AA-Omniscience AccuracySource | 13.3% | — | Not comparable |
| AA-Omniscience Hallucination RateSource | 80.4% | — | Not comparable |
| GPQA-DSource | — | 95.5% | Not comparable |
| HLE w/o toolsSource | — | 50% | Not comparable |
Math1 benchmarks
| Benchmark | GPT-4.1 nano | Sakana Fugu-Ultra | Result |
|---|---|---|---|
| FrontierMath v2 (Tiers 1-3)Source | 1.034% | — | Not comparable |
Multimodal3 benchmarks
Frequently Asked Questions (2)
Which is better, GPT-4.1 nano or Sakana Fugu-Ultra?
GPT-4.1 nano and Sakana Fugu-Ultra are tied on the BenchAlign overall score, so the right pick depends on which category matters most for your use case.
Which is better for knowledge tasks, GPT-4.1 nano or Sakana Fugu-Ultra?
Sakana Fugu-Ultra has the edge for knowledge tasks in this comparison, averaging 95.5 versus 50.3. Inside this category, GPQA is the benchmark that creates the most daylight between them.
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