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© 2026 CompareLLM. Public benchmark data aggregated from Arena Elo, LiveBench, SWE-bench & OpenRouter.

Every score has a dated snapshot.

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  3. Sakana: Fugu Ultra vs Gemini 2.5 Flash

Pairwise benchmark snapshot · Aug 17, 2026noindex (thin pair)

Sakana: Fugu Ultra vs Gemini 2.5 Flash benchmark

In this head-to-head showdown, Gemini 2.5 Flash is more budget-friendly at $2.5/1M per 1M output tokens. Review the complete breakdown below to determine which model best fits your performance and budget requirements.

Executive Comparison Verdict

Bottom Line: Choose Sakana: Fugu Ultra if your priority is peak reasoning, complex code generation, and top preference Elo. Choose Gemini 2.5 Flash if you are optimizing for low latency, high throughput, and cost-efficient API deployment.
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Executive Verdict Summary

Gemini 2.5 Flash holds empirical advantage (3 of 3 metrics)

Coding / SWESWE-bench
Gemini 2.5 FlashTop code solve rate
ReasoningGPQA / Live
Gemini 2.5 FlashTop logical accuracy
Best Value$/1M Tok
Gemini 2.5 FlashLowest API billing cost
Speed / TokTok/Sec
Gemini 2.5 FlashFastest stream rate

Verified Advantage Breakdown

3 benchmarks evaluated across capability, speed, and cost

Sakana: Fugu Ultra (0)Gemini 2.5 Flash (3)
Sakana: Fugu Ultra
0 of 3 Wins
Competitive baseline across remaining benchmarks
Gemini 2.5 Flash
3 of 3 Wins
✓Input price✓Output price✓Context window
sakana
Sakana: Fugu Ultra

Auto-discovered from OpenRouter (sakana/fugu-ultra). Preview until a second source matches.

In: $5 · Out: $30/1M
Google
Leads 3 of 3
Gemini 2.5 Flash

Previous Google speed workhorse.

2.5 FlashElo 1,295In: $0.3 · Out: $2.5/1M
Top Rival Showdowns for Sakana: Fugu Ultra
All Matchups
Compare vs:vs Claude Opus 4.5vs GPT-5vs Gemini 3 Provs Grok 4.6vs DeepSeek V4 Pro
Preference Leader

No shared data

Single model data

Throughput Leader

No shared data

No latency data

Value per Dollar LeaderGemini 2.5 Flash Wins

Gemini 2.5 Flash

$2.5 / 1M output

Capability Percentiles

Relative percentile scores computed across all active models in the benchmark catalog.

Multi-Dimensional Capability Radar

Leaders Matchup Capability Radar

Comparing top standard models across 6 key capability dimensions. Tap any spoke or dot to inspect.

Tap any node to inspect
0–100 %ile

Overall Matchup Breakdown

Category wins across reasoning intelligence, generation speed, and token cost.

Sakana: Fugu Ultra (0)vsGemini 2.5 Flash (9)
Sakana: Fugu Ultra: 0W (0%)Overall: Gemini 2.5 FlashGemini 2.5 Flash: 9W (100%)
← Sakana: Fugu UltraGemini 2.5 Flash →
🏆Gemini 2.5 Flash Leads(4/5)

Intelligence & Reasoning

Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy

Benchmark
Sakana: Fugu UltravsGemini 2.5 Flash
Preference Elo
—vs1,295
Coding Elo
—vs—
SWE-bench
—vs48%
LiveBench
—vs51.4%
GPQA Diamond
—vs68.2%
Sakana: Fugu Ultra: 0WGemini 2.5 Flash: 4W
🏆Gemini 2.5 Flash Leads(2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Benchmark
Sakana: Fugu UltravsGemini 2.5 Flash
Output speed
—vs185 tok/s
Time to first token
—vs110 ms
Sakana: Fugu Ultra: 0WGemini 2.5 Flash: 2W
🏆Gemini 2.5 Flash Leads(3/3)

Pricing & Capacity

Cost per million tokens and max context window length

Benchmark
Sakana: Fugu UltravsGemini 2.5 Flash
Output price
$30/1Mvs$2.5/1M+$27.5/1M
Input price
$5/1Mvs$0.3/1M+$4.7/1M
Context window
1Mvs1M+49k
Sakana: Fugu Ultra: 0WGemini 2.5 Flash: 3W

Side-by-Side Benchmark Matrix

Sakana: Fugu UltraGemini 2.5 Flash
Preference Elo
Sakana: Fugu Ultra—
Gemini 2.5 Flash1,295
LiveBench
Sakana: Fugu Ultra—
Gemini 2.5 Flash51.4%
SWE-bench
Sakana: Fugu Ultra—
Gemini 2.5 Flash48%
GPQA Diamond
Sakana: Fugu Ultra—
Gemini 2.5 Flash68.2%
Time to first token
Sakana: Fugu Ultra—
Gemini 2.5 Flash110 ms
Output speed
Sakana: Fugu Ultra—
Gemini 2.5 Flash185 tok/s
Input priceGemini 2.5 Flash +$4.7/1M
Sakana: Fugu Ultra$5/1M
Gemini 2.5 Flash$0.3/1M
Output priceGemini 2.5 Flash +$27.5/1M
Sakana: Fugu Ultra$30/1M
Gemini 2.5 Flash$2.5/1M
Context windowGemini 2.5 Flash +49k
Sakana: Fugu Ultra1M
Gemini 2.5 Flash1M
BenchmarkSakana: Fugu UltraGemini 2.5 FlashAdvantage Delta
Preference Elo—
1,295
lmarena · Aug 17, 2026
—
LiveBench—
51.4%
livebench · Aug 17, 2026
—
SWE-bench—
48%
swebench · Aug 17, 2026
—
GPQA Diamond—
68.2%
seed-bootstrap · Aug 1, 2026
—
Time to first token—
110 ms
seed-bootstrap · Aug 1, 2026
—
Output speed—
185 tok/s
seed-bootstrap · Aug 1, 2026
—
Input price
$5/1M
openrouter · Aug 17, 2026
$0.3/1M
openrouter · Aug 17, 2026
+$4.7/1M
Output price
$30/1M
openrouter · Aug 17, 2026
$2.5/1M
openrouter · Aug 17, 2026
+$27.5/1M
Context window
1M
openrouter · Aug 17, 2026
1M
openrouter · Aug 17, 2026
+49k

Workload Cost & Savings Calculator

Simulate monthly production API costs in USD (US Dollar).

Save 92% with Gemini 2.5 Flash
Monthly Volume50M tokens/mo
Quick Presets:
Token Ratio (In vs Out)70% In / 30% Out
RAG / Search (10% out)Coding / Chat (50% out)
Sakana: Fugu Ultra$625.00 / mo
In: $175Out: $450
Gemini 2.5 Flash$48.00 / mo
In: $10.5Out: $37.5
Estimated Cost Delta

Gemini 2.5 Flash is estimated to save $577.00/month ($6,924/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

  • 1
    Gemini 2.5 Flash:Pick Gemini 2.5 Flash when you are optimizing output cost.
  • 2
    Gemini 2.5 Flash:Pick Gemini 2.5 Flash for million-token RAG or long-document jobs.

Recommended Workload Routing

Repo / coding agentsinsufficient data

Need SWE-bench on both sides.

High-volume chatGemini 2.5 Flash

Lower output list price ($2.5/1M).

Voice / low-latency UIinsufficient data

Need TTFT on both sides.

Long-document RAGGemini 2.5 Flash

Larger window (1M).

Screenshots / visionGemini 2.5 Flash

Gemini 2.5 Flash is the side marked multimodal in the catalog.

Target WorkloadRecommended PickEvaluation Rationale
Repo / coding agentsinsufficient dataNeed SWE-bench on both sides.
High-volume chatGemini 2.5 FlashLower output list price ($2.5/1M).
Voice / low-latency UIinsufficient dataNeed TTFT on both sides.
Long-document RAGGemini 2.5 FlashLarger window (1M).
Screenshots / visionGemini 2.5 FlashGemini 2.5 Flash is the side marked multimodal in the catalog.

Related Editorial Dispatches & Benchmark Notes

View all news
launchMar 25, 2025

Gemini 2.5 Flash: previous Google speed workhorse, still a baseline

Useful as a cheap historical compare. 3.7 Flash is the 2026 volume SKU.

Cast Your Matchup Vote

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CompareLLM AI Matrix

Verified Head-to-Head Telemetry

LIVE BENCHMARK
VS
sakana

Sakana: Fugu Ultra

Elo n/a
SWE-bench—
Speed (tok/s)1M
Input / 1M Tokens$5/1M
Output / 1M Tokens$30/1M
Google

Gemini 2.5 Flash

Elo 1,295
SWE-bench48%
Speed (tok/s)185 tok/s
Input / 1M Tokens$0.3/1M
Output / 1M Tokens$2.5/1M

Frequently Asked Questions

Which is better overall, Sakana: Fugu Ultra or Gemini 2.5 Flash?
We do not have preference Elo for both models, so we do not declare an overall winner. Compare the metrics that exist.
Which is better at coding, Sakana: Fugu Ultra or Gemini 2.5 Flash?
SWE-bench is missing for at least one model, so we do not rank coding from a single number.
Which is cheaper to run in production?
Gemini 2.5 Flash output tokens are $2.5/1M versus $30/1M. Input prices and retry rates still move the real bill.
Which is faster, Sakana: Fugu Ultra or Gemini 2.5 Flash?
We do not have TTFT for both models.
Which has the larger context window?
Gemini 2.5 Flash accepts 1M tokens versus 1M.
Can I self-host either model?
Neither model is marked open-weights here. You are comparing hosted APIs.
Are these scores from CompareLLM’s own evals?
No. V1 aggregates public leaderboards (and optional first-party latency pings). Each cell names its source and date. Read /methodology.
What does preference Elo mean on this page?
Preference Elo is a crowd vote from LMArena / Arena. People see two hidden answers and pick the one they like more. The model that wins more often gets a higher Elo. That means people preferred it — not that it passed a school test. It is not SWE-bench, not accuracy, and not a number we invent. Sakana: Fugu Ultra and Gemini 2.5 Flash Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Related news

  • launch · Mar 25, 2025

    Gemini 2.5 Flash: previous Google speed workhorse, still a baseline

Similar Head-to-Head Comparisons

All Sakana: Fugu Ultra matchups →|All Gemini 2.5 Flash matchups →
Gemini 2.5 Flash vs Gemini 2.0 Flash Thinking (previous gemini-flash)Gemini 2.5 Flash vs Gemini 3 Flash (next gemini-flash)Gemini 3 Pro vs Gemini 2.5 FlashGemini 3.6 Pro vs Gemini 2.5 FlashGemini 3.6 Flash vs Gemini 2.5 FlashGemini 3.7 Flash vs Gemini 2.5 Flash