Model comparison
Sakana Fugu-Ultra vs Step 3.7 Flash
Head-to-head evidence from 3 shared benchmark results across 2 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Sakana Fugu-Ultra unranked (Not scored); Step 3.7 Flash #110 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Sakana Fugu-Ultra and Step 3.7 Flash share 3 comparable benchmark results. 2 of 8 categories are comparable. 8 results are unique to Sakana Fugu-Ultra; 26 to Step 3.7 Flash.
Updated July 23, 2026- Shared results
- 3
- Sakana Fugu-Ultra only
- 8
- Step 3.7 Flash only
- 26
- Comparable categories
- 2 / 8
Treat this as a split decision. Sakana Fugu-Ultra makes more sense if agentic is the priority or you need the larger 1M context window; Step 3.7 Flash is the better fit if its strengths line up with your actual workload.
Confidence note. This is a partial-evidence comparison with 3 shared benchmark results across 2 evidence categories; 2 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Sakana Fugu-Ultra and Step 3.7 Flash 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 gives you the larger context window at 1M, compared with 256K for Step 3.7 Flash.
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 | Sakana Fugu-Ultra | Δ | Step 3.7 Flash |
|---|---|---|---|
| Agentic | Sakana Fugu-Ultra82.1 | Margin← 15.7 | Step 3.7 Flash66.4 |
| Coding | Sakana Fugu-Ultra64.5 | Margin← 8.2 | Step 3.7 Flash56.3 |
| Reasoning | Sakana Fugu-Ultra93.6 | MarginNo overlap | Step 3.7 FlashNot measured |
| Knowledge | Sakana Fugu-Ultra95.5 | MarginNo overlap | Step 3.7 FlashNot measured |
| Multimodal | Sakana Fugu-Ultra86.6 | MarginNo overlap | Step 3.7 FlashNot measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
Terminal-Bench 2.0
AgenticA 82.1%B 59.5%Winner: Sakana Fugu-UltraΔ 22.6Terminal-Bench 2.0: Sakana Fugu-Ultra scored 82.1%; Step 3.7 Flash scored 59.5%. Sakana Fugu-Ultra wins this benchmark. - Source ↗
SWE-bench Pro
CodingA 73.7%B 56.3%Winner: Sakana Fugu-UltraΔ 17.4SWE-bench Pro: Sakana Fugu-Ultra scored 73.7%; Step 3.7 Flash scored 56.3%. Sakana Fugu-Ultra wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Sakana Fugu-Ultra | Step 3.7 Flash | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Sakana Fugu-UltraNot available | Step 3.7 Flash$0.2 input / $1.15 output | A complete price comparison is not available. |
| Generation speedtokens per second | Sakana Fugu-UltraNot available | Step 3.7 FlashNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Sakana Fugu-UltraNot available | Step 3.7 FlashNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Sakana Fugu-Ultra1M | Step 3.7 Flash256K | Sakana Fugu-Ultra lists the larger context window. |
Benchmark Deep Dive
AgenticSakana Fugu-Ultra wins12 benchmarks
| Benchmark | Sakana Fugu-Ultra | Step 3.7 Flash | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 82.1% | 59.5% | Sakana Fugu-Ultra leads |
| BrowseCompSource | — | 75.8% | Not comparable |
| DeepSearchQASource | — | 92.8% | Not comparable |
| GDPval-AASource | — | 25.9% | Not comparable |
| ToolathlonSource | — | 49.5% | Not comparable |
| Claw-EvalSource | — | 67.1% | Not comparable |
| HLE w/ toolsSource | — | 47.2% | Not comparable |
| Gert LabsSource | — | 51.57% | Not comparable |
| AA Agentic IndexSource | — | 21.5% | Not comparable |
| τ²-bench resultsSource | — | 98.5% | Not comparable |
| GDPval-AASource | — | 1017 | Not comparable |
| APEX-Agents-AASource | — | 14.8% | Not comparable |
CodingSakana Fugu-Ultra wins7 benchmarks
| Benchmark | Sakana Fugu-Ultra | Step 3.7 Flash | Result |
|---|---|---|---|
| SWE-bench ProSource | 73.7% | 56.3% | Sakana Fugu-Ultra leads |
| Terminal-Bench 2.0Source | 82.1% | 59.5% | Sakana Fugu-Ultra leads |
| LiveCodeBench v6Source | 93.2% | — | Not comparable |
| LiveCodeBench ProSource | 90.8% | — | Not comparable |
| SciCodeSource | 58.7% | — | Not comparable |
| AA Coding IndexSource | — | 39.6% | Not comparable |
| AA-SciCodeSource | — | 40.0% | Not comparable |
Reasoning3 benchmarks
Knowledge9 benchmarks
| Benchmark | Sakana Fugu-Ultra | Step 3.7 Flash | Result |
|---|---|---|---|
| GPQASource | 95.5% | — | Not comparable |
| GPQA-DSource | 95.5% | — | Not comparable |
| HLE w/o toolsSource | 50% | — | Not comparable |
| Artificial Analysis Intelligence IndexSource | — | 30.3% | Not comparable |
| AA-GPQA DiamondSource | — | 80.9% | Not comparable |
| AA-HLESource | — | 19.9% | Not comparable |
| AA-Omniscience IndexSource | — | -37.5% | Not comparable |
| AA-Omniscience AccuracySource | — | 25.4% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 84.4% | Not comparable |
Multimodal5 benchmarks
Inst. Following1 benchmarks
| Benchmark | Sakana Fugu-Ultra | Step 3.7 Flash | Result |
|---|---|---|---|
| AA-IFBenchSource | — | 67.3% | Not comparable |
Frequently Asked Questions (3)
Which is better, Sakana Fugu-Ultra or Step 3.7 Flash?
Sakana Fugu-Ultra and Step 3.7 Flash 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 coding, Sakana Fugu-Ultra or Step 3.7 Flash?
Sakana Fugu-Ultra has the edge for coding in this comparison, averaging 64.5 versus 56.3. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, Sakana Fugu-Ultra or Step 3.7 Flash?
Sakana Fugu-Ultra has the edge for agentic tasks in this comparison, averaging 82.1 versus 66.4. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
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