Fugu Ultra

Reference benchmarks for Fugu Ultra

These are external benchmarks I pulled from the source comparison guides on agentos.guide — SWE-bench Verified, DRACO, Kilo plan rubric, build-time measurements, vendor-reported coding scores. They are not goldiebench medal scores (those come only from same-prompt one-shot creative coding tasks in the matrix). I surface them here so the spec sheet for Fugu Ultra is honest about what's measured.

What is Fugu Ultra?

Fugu Ultra is the Sakana AI frontier model with a 272,000 tokens with the standard rate. Calls exceeding 272K context are billed at the higher 'long-context' rates. context window, released 2026-06-15. Tagline: Sakana's multi-agent answer to Fusion — frontier ensemble without single-vendor risk.. Official source: sakana.ai.

Pricing detail. Sakana's multi-agent orchestration: a single API call internally dispatches to multiple frontier models and synthesises the answer. Subscription plans run $20-$200/mo (Standard / Pro / Max); PAYG is $5/M input + $30/M output for Fugu Ultra. Direct competitor to OpenRouter Fusion's panel approach.

How I use it inside the Agent OS. Dispatched from Agent OS as the panel-ensemble alternative to OpenRouter Fusion. Bench scored by Claude judge against the same 42 prompts as every other model.

What I built with Fugu Ultra

Every model on Goldie Bench gets the same fixed prompt set — one shot, single HTML file out — and I score the result 0–10 inside the Agent Operating System. Here's what Fugu Ultra shipped on the bench: 42 one-shot demos across 272,000 tokens with the standard rate. Calls exceeding 272K context are billed at the higher 'long-context' rates. of context. Of those, 42 are scored against the field with my honest 0–10 from the source guides at agentos.guide.

Best for

• Teams that want Fusion-class quality but need a different vendor risk profile
• Operators avoiding export-controlled providers (Sakana emphasises this in their pitch)
• Deep-research workflows where ensemble verdicts beat single-model answers

Every benchmark — Fugu Ultra's full scorecard

All 42 scored tasks, best first — the judge's 0–10 on the same rubric as the whole field. Click any bar for that task's cross-model page, or open this scorecard in the interactive graphs. Full editorial breakdown with judge quotes and sourced outside research: the Fugu Ultra deep dive →.

Compare Fugu Ultra against every other model

Every head-to-head featuring Fugu Ultra. Verdicts shown for scored pairs.

See all 66 comparisons across every model →

Quick pill index

Direct comparisons against every other scored model on the bench:

Read more on agentos.guide: /sakana-fugu-vs-fusion

Fugu Ultra — frequently asked