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October 27, 2026 · Fireworks AI

Rune 26B-A4B available on Serverless, returning probabilities for up to 256 questions

Rune 26B-A4B is now available on Serverless. It's a System One decision model, so it doesn't reason and doesn't generate text. You send a document and up to 256 typed questions about it, and it returns a calibrated probability for each answer from a single read. Questions can be multiple choice, true/false, or a graded scale. Output tokens are always zero, so you're billed for input only.

Call accounts/fireworks/models/rune through the System One decisions API or the OpenAI-compatible Decisions API. It accepts text only, up to 262K context. Rates are on Serverless pricing.

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