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Runway image_to_video 400? Check your promptImage field before you touch the prompt

This story is from 2026-10-11. It is preserved in the archive; the latest stories are on the live feed.

An agent was generating a product video with Runway. Prompt looked fine. Image was a valid PNG. The API said 400, and the agent did what agents do: rewrote the prompt five times. Nothing changed. The bug was never the prompt. It was the shape of the promptImage field. // Runway image_to_video only…

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  1. 2026-10-11 16:58 · DEV Community — AI
    Runway image_to_video 400? Check your promptImage field before you touch the prompt

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