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Fugu Ultra v2 is the higher-performance tier of Sakana AI's Fugu family: rather than a single trained checkpoint, OpenRouter describes it as a learned multi-agent orchestration system that routes each request across a pool of models, exposed here with a 1M-token context. It is proprietary and priced at the top of the Fugu line, aimed at the hardest coding, reasoning, and tool-use tasks where Fugu Max's lower cost is not enough.

Claude Haiku 4.5 is Anthropic's fast, affordable small model in the Claude 4 generation, balancing strong instruction-following and coding ability with low latency. It is designed for high-throughput agentic and chat applications where speed and cost efficiency are priorities.