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.
Latest Fireworks AI platform changes
Public cookbook moves to fw-ai-external/cookbook, fireworks-training-cookbook on PyPI
Ultra-fast Serverless mode in Preview, with DeepSeek V4.1 Flash 1017 at 6-8x speed
DeepSeek V4 Flash (0731) removed from the shared Serverless Training pool
fireworks-ai 1.2.30 replaces TITO sidecar 502 errors with source-specific error codes
Six Serverless models deprecated, to be decommissioned on November 7, 2026