Model comparison
Claude Mythos 5 vs Sakana Fugu
Head-to-head evidence from 6 shared benchmark results across 4 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude Mythos 5 #1 (Supported); Sakana Fugu unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Mythos 5 and Sakana Fugu share 6 comparable benchmark results. 4 of 8 categories are comparable. 9 results are unique to Claude Mythos 5; 5 to Sakana Fugu.
Updated July 23, 2026- Shared results
- 6
- Claude Mythos 5 only
- 9
- Sakana Fugu only
- 5
- Comparable categories
- 4 / 8
Treat this as a split decision. Claude Mythos 5 makes more sense if coding is the priority or you need the larger 1M+ context window; Sakana Fugu is the better fit if knowledge is the priority.
Confidence note. This is a partial-evidence comparison with 6 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 Mythos 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.
Claude Mythos 5 gives you the larger context window at 1M+, compared with 1M for Sakana Fugu.
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 | Claude Mythos 5 | Δ | Sakana Fugu |
|---|---|---|---|
| Coding | Claude Mythos 589.7 | Margin← 30.0 | Sakana Fugu59.7 |
| Knowledge | Claude Mythos 568.5 | Margin→ 27.0 | Sakana Fugu95.5 |
| Multimodal | Claude Mythos 593.5 | Margin← 8.4 | Sakana Fugu85.1 |
| Agentic | Claude Mythos 587.0 | Margin← 6.8 | Sakana Fugu80.2 |
| Reasoning | Claude Mythos 5Not measured | MarginNo overlap | Sakana Fugu86.6 |
| Math | Claude Mythos 597.6 | MarginNo overlap | Sakana FuguNot measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
SWE-bench Pro
CodingA 80.3%B 59%Winner: Claude Mythos 5Δ 21.3SWE-bench Pro: Claude Mythos 5 scored 80.3%; Sakana Fugu scored 59%. Claude Mythos 5 wins this benchmark. - Source ↗
CharXiv
MultimodalA 93.5%B 85.1%Winner: Claude Mythos 5Δ 8.4CharXiv: Claude Mythos 5 scored 93.5%; Sakana Fugu scored 85.1%. Claude Mythos 5 wins this benchmark. - Source ↗
Terminal-Bench 2.0
AgenticA 88%B 80.2%Winner: Claude Mythos 5Δ 7.8Terminal-Bench 2.0: Claude Mythos 5 scored 88%; Sakana Fugu scored 80.2%. Claude Mythos 5 wins this benchmark. - Source ↗
GPQA
KnowledgeA 94.1%B 95.5%Winner: Sakana FuguΔ 1.4GPQA: Claude Mythos 5 scored 94.1%; Sakana Fugu scored 95.5%. Sakana Fugu wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude Mythos 5 | Sakana Fugu | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Mythos 5$10 input / $50 output | Sakana FuguNot available | A complete price comparison is not available. |
| Generation speedtokens per second | Claude Mythos 5Not available | Sakana FuguNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Mythos 5Not available | Sakana FuguNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Mythos 51M+ | Sakana Fugu1M | Claude Mythos 5 lists the larger context window. |
Benchmark Deep Dive
AgenticClaude Mythos 5 wins4 benchmarks
CodingClaude Mythos 5 wins6 benchmarks
| Benchmark | Claude Mythos 5 | Sakana Fugu | Result |
|---|---|---|---|
| SWE-bench VerifiedSource | 95.5% | — | Not comparable |
| SWE-bench ProSource | 80.3% | 59% | Claude Mythos 5 leads |
| Terminal-Bench 2.0Source | 88.0% | 80.2% | Claude Mythos 5 leads |
| LiveCodeBench v6Source | — | 92.9% | Not comparable |
| LiveCodeBench ProSource | — | 87.8% | Not comparable |
| SciCodeSource | — | 60.1% | Not comparable |
Reasoning1 benchmarks
| Benchmark | Claude Mythos 5 | Sakana Fugu | Result |
|---|---|---|---|
| MRCRv2Source | — | 86.6% | Not comparable |
KnowledgeSakana Fugu wins4 benchmarks
Math1 benchmarks
| Benchmark | Claude Mythos 5 | Sakana Fugu | Result |
|---|---|---|---|
| USAMO 2026Source | 97.6% | — | Not comparable |
Multilingual1 benchmarks
| Benchmark | Claude Mythos 5 | Sakana Fugu | Result |
|---|---|---|---|
| SWE MultilingualSource | 92.2% | — | Not comparable |
Frequently Asked Questions (5)
Which is better, Claude Mythos 5 or Sakana Fugu?
Claude Mythos 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 Mythos 5 or Sakana Fugu?
Sakana Fugu has the edge for knowledge tasks in this comparison, averaging 95.5 versus 68.5. Inside this category, HLE w/o tools is the benchmark that creates the most daylight between them.
Which is better for coding, Claude Mythos 5 or Sakana Fugu?
Claude Mythos 5 has the edge for coding in this comparison, averaging 89.7 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 Mythos 5 or Sakana Fugu?
Claude Mythos 5 has the edge for agentic tasks in this comparison, averaging 87 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 Mythos 5 or Sakana Fugu?
Claude Mythos 5 has the edge for multimodal and grounded tasks in this comparison, averaging 93.5 versus 85.1. Inside this category, CharXiv is the benchmark that creates the most daylight between them.
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