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Model comparison

Claude Sonnet 5 vs Sakana Fugu

Data verified

Head-to-head evidence from 5 shared benchmark results across 4 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

65.32/100
No comparison
Sakana Fugu
Sakana AI
N/A
3 category wins1 category wins

Public leaderboard positions: Claude Sonnet 5 #29 (Estimated); Sakana Fugu unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude Sonnet 5 and Sakana Fugu share 5 comparable benchmark results. 4 of 8 categories are comparable. 31 results are unique to Claude Sonnet 5; 6 to Sakana Fugu.

Updated July 23, 2026
Shared results
5
Claude Sonnet 5 only
31
Sakana Fugu only
6
Comparable categories
4 / 8

Treat this as a split decision. Claude Sonnet 5 makes more sense if coding is the priority; Sakana Fugu is the better fit if knowledge is the priority.

Confidence note. This is a partial-evidence comparison with 5 shared benchmark results across 4 evidence categories; 4 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

Claude Sonnet 5 and Sakana Fugu 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 scores and score margins for Claude Sonnet 5 and Sakana Fugu
CategoryClaude Sonnet 5ΔSakana Fugu
KnowledgeClaude Sonnet 557.4Margin→ 38.1Sakana Fugu95.5
CodingClaude Sonnet 576.7Margin← 17.0Sakana Fugu59.7
MultimodalClaude Sonnet 588.3Margin← 3.2Sakana Fugu85.1
AgenticClaude Sonnet 581.9Margin← 1.7Sakana Fugu80.2
ReasoningClaude Sonnet 5Not measuredMarginNo overlapSakana Fugu86.6

Decisive benchmark drivers

The largest measured benchmark gaps in this matchup, with exact reported values.

More
A · Claude Sonnet 5B · Sakana Fugu

  1. SWE-bench Pro

    Coding
    Source ↗
    A 63.2%B 59%
    Winner: Claude Sonnet 5Δ 4.2
    SWE-bench Pro: Claude Sonnet 5 scored 63.2%; Sakana Fugu scored 59%. Claude Sonnet 5 wins this benchmark.

  2. CharXiv

    Multimodal
    Source ↗
    A 88.3%B 85.1%
    Winner: Claude Sonnet 5Δ 3.2
    CharXiv: Claude Sonnet 5 scored 88.3%; Sakana Fugu scored 85.1%. Claude Sonnet 5 wins this benchmark.

  3. Terminal-Bench 2.0

    Agentic
    Source ↗
    A 80.4%B 80.2%
    Winner: Claude Sonnet 5Δ 0.2
    Terminal-Bench 2.0: Claude Sonnet 5 scored 80.4%; Sakana Fugu scored 80.2%. Claude Sonnet 5 wins this benchmark.

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

MetricClaude Sonnet 5Sakana FuguComparison
Input / output priceUSD per 1M tokensClaude Sonnet 5$2 input / $10 outputSakana FuguNot availableA complete price comparison is not available.
Generation speedtokens per secondClaude Sonnet 5Not availableSakana FuguNot availableA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude Sonnet 5Not availableSakana FuguNot availableA complete latency comparison is not available.
Context windowmaximum listed tokensClaude Sonnet 51MSakana Fugu1MListed context windows are equal.

Benchmark Deep Dive

AgenticClaude Sonnet 5 wins
BenchmarkClaude Sonnet 5Sakana FuguResult
Terminal-Bench 2.0Source 80.4%80.2%Claude Sonnet 5 leads
BrowseCompSource 84.7%—Not comparable
HLE w/ toolsSource 57.4%—Not comparable
OSWorld-VerifiedSource 81.2%—Not comparable
GDPval-AASource 1607—Not comparable
AA Agentic IndexSource 46.7%—Not comparable
GDPval-AASource 55.4%—Not comparable
AA BriefcaseSource 1388—Not comparable
AA AutomationBenchSource 39.2%—Not comparable
AA EnterpriseOps-GymSource 44.7%—Not comparable
AA Harvey LABSource 90.1%—Not comparable
AA Tau3 BankingSource 28.2%—Not comparable
aaTerminalBench21Source 80.5%—Not comparable
CodingClaude Sonnet 5 wins
BenchmarkClaude Sonnet 5Sakana FuguResult
SWE-bench VerifiedSource 85.2%—Not comparable
SWE-bench ProSource 63.2%59%Claude Sonnet 5 leads
SWE MultilingualSource 78.3%—Not comparable
SWE MultimodalSource 28.1%—Not comparable
Terminal-Bench 2.0Source 80.4%80.2%Claude Sonnet 5 leads
FrontierCode 1.1 MainSource 42.7%—Not comparable
cursorBench32Source 61.5%—Not comparable
AA Coding IndexSource 71.5%—Not comparable
AA-SciCodeSource 53.6%—Not comparable
LiveCodeBench v6Source —92.9%Not comparable
LiveCodeBench ProSource —87.8%Not comparable
SciCodeSource —60.1%Not comparable
Reasoning
BenchmarkClaude Sonnet 5Sakana FuguResult
AA-LCRSource 70.7%—Not comparable
CritPtSource 16.9%—Not comparable
MRCRv2Source —86.6%Not comparable
KnowledgeSakana Fugu wins
BenchmarkClaude Sonnet 5Sakana FuguResult
HLESource 57.4%—Not comparable
HLE w/o toolsSource 43.2%47.2%Sakana Fugu leads
Artificial Analysis Intelligence IndexSource 53.4%—Not comparable
AA-GPQA DiamondSource 91.1%—Not comparable
AA-HLESource 39.6%—Not comparable
AA-Omniscience IndexSource 15.3%—Not comparable
AA-Omniscience AccuracySource 38.3%—Not comparable
AA-Omniscience Hallucination RateSource 37.3%—Not comparable
GPQASource —95.5%Not comparable
GPQA-DSource —95.5%Not comparable
MultimodalClaude Sonnet 5 wins
BenchmarkClaude Sonnet 5Sakana FuguResult
CharXivSource 88.3%85.1%Claude Sonnet 5 leads
CharXiv w/o toolsSource 77%—Not comparable
AA-MMMU-ProSource 77.3%—Not comparable
Design Arena WebsiteSource 1314—Not comparable
Frequently Asked Questions (5)

Which is better, Claude Sonnet 5 or Sakana Fugu?

Claude Sonnet 5 and Sakana Fugu 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, Claude Sonnet 5 or Sakana Fugu?

Sakana Fugu has the edge for knowledge tasks in this comparison, averaging 95.5 versus 57.4. Inside this category, HLE w/o tools is the benchmark that creates the most daylight between them.

Which is better for coding, Claude Sonnet 5 or Sakana Fugu?

Claude Sonnet 5 has the edge for coding in this comparison, averaging 76.7 versus 59.7. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.

Which is better for agentic tasks, Claude Sonnet 5 or Sakana Fugu?

Claude Sonnet 5 has the edge for agentic tasks in this comparison, averaging 81.9 versus 80.2. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.

Which is better for multimodal and grounded tasks, Claude Sonnet 5 or Sakana Fugu?

Claude Sonnet 5 has the edge for multimodal and grounded tasks in this comparison, averaging 88.3 versus 85.1. Inside this category, CharXiv is the benchmark that creates the most daylight between them.

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