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YAML vs JSON for LLMs: Real Token Counts, Real Gotchas

This story is from 2026-10-13. It is preserved in the archive; the latest stories are on the live feed.

Originally published on DevToolHub . YAML vs JSON for LLMs isn't just a style preference — it changes how many tokens you pay for on every request. I ran both formats through a real tokenizer on identical data instead of repeating the "20-ish percent" figures floating around online, and the gap is…

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  1. 2026-10-13 11:46 · DEV Community — AI
    YAML vs JSON for LLMs: Real Token Counts, Real Gotchas

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