Woofun AI reports that Japanese AI startup Sakana AI has deployed its multi-agent collaborative system, Fugu Ultra, on OpenRouter. The platform dynamically orchestrates GPT-5.5, Gemini 3.1 Pro, and Claude Opus 4.8 via a unified interface, achieving superior performance against Anthropic's Claude Fable 5 and Mythos Preview in academic and programming evaluations.

Fugu Ultra employs coordination mechanisms derived from ICLR 2026 papers Trinity and Conductor, assigning specific roles such as commonsense reasoning to Gemini 3.1 Pro and error correction to GPT-5.5. The service provides a 1 million token context window with pricing set at $5 per million input tokens, $30 for outputs, and $0.5 for cache reads.