Namazu

Sakana AI's Japanese-specialized reasoning and agent model, opened as an API on Aug 11 2026. Rather than pretraining from scratch, Sakana builds on Moonshot's open-weight Kimi K2.6 and adds training for Japanese language and business contexts — the lab's 'sovereign AI by tuning other labs' strategy. Handles Japanese instruction following, business writing, math, coding, research, and multi-step agentic workflows; accepts text, images, and files such as PDFs and returns text, over a 262,144-token context with up to 65,536 output tokens, and ships native web-search and code-execution tools through a unified OpenAI-compatible API. Priced on OpenRouter at $0.95 / $4.00 per 1M input/output tokens. Not available in the EU/EEA, the UK, or Switzerland. Served via API; weights not separately published (base Kimi K2.6 is open-weight).