---
id: "sakana/fugu-ultra-v2"
also: ["sakana/fugu-ultra-v2-20260911", "vercel/sakana/fugu-ultra-v2"]
card_usd_per_m: "5.0 in, 30.0 out, at sakana"
cheapest_list_usd_per_m: "5.0 in, 30.0 out, at sakana on openrouter"
cheapest_effective_usd_per_m: "2.3458 in, 30.0 out, at sakana on openrouter"
context: 1000000
max_output: 128000
input: ["text", "image", "file"]
output: ["text"]
released: "2026-09-11"
reasoning: ["max", "xhigh", "high"]
api: ["/api/v1/chat/completions", "/api/v1/completions", "/api/v1/messages", "/api/v1/responses"]
params: ["include_reasoning", "max_tokens", "reasoning", "reasoning_effort", "response_format", "stop", "structured_outputs", "temperature", "tool_choice", "tools", "web_search_options"]
endpoints: 2
gateways: "openrouter (1), vercel (1)"
no_training: 2
trains: 0
retains_prompts: 2
---
# Sakana: Fugu Ultra v2

Fugu Ultra v2 is the higher-performance model in Sakana AI's Fugu family. Rather than a single monolithic model, Fugu is a learned multi-agent orchestration system: a language model trained to...