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Caelis

Caelis

Open-source runtime for long-running AI agent work

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Caelis is an open-source, terminal-first runtime for long-running AI agent work. Run GPT-6 Astra as the lead agent and bring specialist models and ACP agents into the same local session. Participants exchange messages, use tools, and keep their own conversations. Follow their work in split panes, steer agents directly, and resume durable sessions with built-in memory and approval controls.

Caelis makers

Here are the founders, developers, designers and product people who worked on Caelis