Model comparison
Laguna S 2.1 vs Sakana Fugu-Ultra
Head-to-head evidence from 3 shared benchmark results across 2 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Evidence parity. Laguna S 2.1 and Sakana Fugu-Ultra share 3 comparable benchmark results. 2 of 8 categories are comparable. 3 results are unique to Laguna S 2.1; 8 to Sakana Fugu-Ultra.
Updated July 21, 2026- Shared results
- 3
- Laguna S 2.1 only
- 3
- Sakana Fugu-Ultra only
- 8
- Comparable categories
- 2 / 8
Treat this as a split decision. Laguna S 2.1 makes more sense if its workflow fits your team better; Sakana Fugu-Ultra is the better fit if agentic is the priority.
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
Laguna S 2.1 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.
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 | Laguna S 2.1 | Δ | Sakana Fugu-Ultra |
|---|---|---|---|
| Agentic | Laguna S 2.170.2 | Margin→ 11.9 | Sakana Fugu-Ultra82.1 |
| Coding | Laguna S 2.159.4 | Margin→ 5.1 | Sakana Fugu-Ultra64.5 |
| Reasoning | Laguna S 2.1Not measured | MarginNo overlap | Sakana Fugu-Ultra93.6 |
| Knowledge | Laguna S 2.1Not measured | MarginNo overlap | Sakana Fugu-Ultra95.5 |
| Multimodal | Laguna S 2.1Not measured | MarginNo overlap | Sakana Fugu-Ultra86.6 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
SWE-bench Pro
CodingA 59.4%B 73.7%Winner: Sakana Fugu-UltraΔ 14.3SWE-bench Pro: Laguna S 2.1 scored 59.4%; Sakana Fugu-Ultra scored 73.7%. Sakana Fugu-Ultra wins this benchmark. - Source ↗
Terminal-Bench 2.0
AgenticA 70.2%B 82.1%Winner: Sakana Fugu-UltraΔ 11.9Terminal-Bench 2.0: Laguna S 2.1 scored 70.2%; Sakana Fugu-Ultra scored 82.1%. Sakana Fugu-Ultra wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Laguna S 2.1 | Sakana Fugu-Ultra | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Laguna S 2.1$0.1 input / $0.2 output | Sakana Fugu-UltraNot available | A complete price comparison is not available. |
| Generation speedtokens per second | Laguna S 2.1Not available | Sakana Fugu-UltraNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Laguna S 2.1Not available | Sakana Fugu-UltraNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Laguna S 2.11M | Sakana Fugu-Ultra1M | Listed context windows are equal. |
Benchmark Deep Dive
AgenticSakana Fugu-Ultra wins2 benchmarks
CodingSakana Fugu-Ultra wins7 benchmarks
| Benchmark | Laguna S 2.1 | Sakana Fugu-Ultra | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 70.2% | 82.1% | Sakana Fugu-Ultra leads |
| SWE MultilingualSource | 78.5% | — | Not comparable |
| SWE-bench ProSource | 59.4% | 73.7% | Sakana Fugu-Ultra leads |
| deepSweSource | 40.4% | — | Not comparable |
| LiveCodeBench v6Source | — | 93.2% | Not comparable |
| LiveCodeBench ProSource | — | 90.8% | Not comparable |
| SciCodeSource | — | 58.7% | Not comparable |
Reasoning1 benchmarks
| Benchmark | Laguna S 2.1 | Sakana Fugu-Ultra | Result |
|---|---|---|---|
| MRCRv2Source | — | 93.6% | Not comparable |
Knowledge3 benchmarks
Multimodal1 benchmarks
| Benchmark | Laguna S 2.1 | Sakana Fugu-Ultra | Result |
|---|---|---|---|
| CharXivSource | — | 86.6% | Not comparable |
Frequently Asked Questions (3)
Which is better, Laguna S 2.1 or Sakana Fugu-Ultra?
Laguna S 2.1 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 coding, Laguna S 2.1 or Sakana Fugu-Ultra?
Sakana Fugu-Ultra has the edge for coding in this comparison, averaging 64.5 versus 59.4. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, Laguna S 2.1 or Sakana Fugu-Ultra?
Sakana Fugu-Ultra has the edge for agentic tasks in this comparison, averaging 82.1 versus 70.2. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
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