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Fugu Ultra vs GPT-5.5
Fugu Ultra (Sakana) and GPT-5.5 (OpenAI) compared on benchmarks, pricing, context window, and use-case rankings.
- GPT-5.5 has a larger context window (1.1M vs 1M tokens).
Scores
Intelligence (ECI)—159
Coding—91
Math—97
Reasoning & Knowledge—92
Agentic & Tools—87
Specifications
DeveloperSakanaOpenAI
Family—GPT
ReleasedJun 24, 2026Apr 23, 2026
Parameters——
Availability—API access
Context window1M1.1M
Price — $/M input$5.00$5.00
Price — $/M output$30.00$30.00
Inputstext, imagefile, image, text
Outputstexttext
Benchmarks
AIME 2024/2025—100%
APEX—38%
ARC-AGI—95%
ARC-AGI-2—85%
FrontierMath—52%
FrontierMath Tier 4—35%
GPQA Diamond—94%
GSO (code optimization)—40%
Humanity's Last Exam—44%
SciCode—56%
SimpleBench—69%
SimpleQA Verified—63%
SWE-bench Verified—81%
Terminal-Bench—85%
WebDev Arena—1505
WeirdML—85%
τ²-bench—94%
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Which is cheaper, Fugu Ultra or GPT-5.5?
Fugu Ultra is cheaper on input tokens at $5.00 per million, versus $5.00 (representative OpenRouter pricing).
Which has a larger context window, Fugu Ultra or GPT-5.5?
GPT-5.5 supports up to 1.1M tokens, compared with 1M for the other.
Want a different match-up? Open the compare tool to add or swap models.
More comparisons
Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.