I ran every Claude agent turn through the Batch API

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I ran every Claude agent turn through the Batch API is active in the show hn launch space.

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I built a tiny Python REPL to answer a dumb-but-useful question:What happens if every turn in an agent loop goes through Anthropic’s Batch API instead of the normal synchronous endpoint?The motivation was cost. Batch API is 50% off, which sounds very attractive for agent workloads: evals, background research agents, CI agents, unattended subagents, etc.The result: it works, but it is awful for a single interactive agent.In my runs, a one-entry batch usually took ~90–120 seconds to complete. That means a five-turn tool loop becomes a ten-minute interaction. Waiting two minutes for the model to decide it needs to run ls is not a good UX.But that was also the point of the experiment. A single R

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Website: eran.sandler.co.il/post/2026-04-27-batch-api-is-terrible-for-one-agent