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I built Flatkey to separate cheap prompt experiments from final generations

This story is from 2026-09-16. It is preserved in the archive; the latest stories are on the live feed.

I’ve been working on Flatkey, an OpenAI/Anthropic-compatible gateway for teams that spend a lot of time iterating on prompts. The basic idea is to avoid sending every exploratory attempt through the most expensive model path: use a lower-cost route for testing structure, wording, formatting, and co…

Read the full story at r/PromptEngineering ↗

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  1. 2026-09-16 22:58 · r/PromptEngineering
    I built Flatkey to separate cheap prompt experiments from final generations

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