Sakana Fugu Ultra
AI Gateway model route from Sakana AI that coordinates a pool of frontier models behind the
sakana/fugu-ultraslug rather than exposing a single open-weight checkpoint.
What It Is
Sakana Fugu Ultra is useful as a model-router reference, not as a downloadable model family. Vercel's changelog says it coordinates several publicly accessible frontier models, routes work to 1-3 agents depending on the problem, and combines their results into one answer. The AI SDK usage surface is the normal Gateway model string: model: "sakana/fugu-ultra". Source: Vercel changelog, 2026-06-22
That makes it closer to OrcaRouter / Fusion-style orchestration than to GLM-5.2's open-weights route. Treat the benchmark and "Mythos-class" positioning as provider claims until a stable independent eval exists. The production-relevant fact is the Gateway abstraction: one app-facing slug can hide a changing model pool, while AI Gateway still owns usage/cost tracking, retries, failover, ZDR support, budgets, BYOK, and no platform markup. Source: Vercel changelog, 2026-06-22
Version Snapshot
Checked 2026-07-04: Vercel's changelog and live AI Gateway model page are reachable, and the public route is sakana/fugu-ultra. No package, open checkpoint, public release tag, or semver version applies; record the provider slug and checked Gateway status instead. Source: Vercel AI Gateway model page, checked 2026-07-04
Routing
Use Fugu Ultra when a Vercel-hosted TypeScript app already routes models through Vercel AI SDK / AI Gateway and wants a single model slug backed by a multi-model answer pool. Do not route it as a default cheap model or an open-weights option. For open-weight coding/agent work, compare GLM-5.2; for explicit provider/routing controls outside Vercel, compare OpenRouter and OrcaRouter.
Timeline
- 2026-06-22 | Vercel announced Sakana Fugu Ultra on AI Gateway as
sakana/fugu-ultra, with a model pool that routes to 1-3 agents and combines results. Source: Vercel changelog, 2026-06-22 - 2026-07-04 | Deep-reviewed the bookmarked Vercel Developers row and checked the live AI Gateway model page. Created this model-route page instead of folding the row into generic AI SDK notes. Source: X/@vercel_dev, 2026-06-22; Source: Vercel AI Gateway model page, checked 2026-07-04