Strands Decider 2B

Strands Decider 2B is a compact open-source decision model that the Strands Agents project, part of AWS, released on 1 October 2026. Instead of generating text, it picks among options given in the prompt, such as a yes-or-no call or a choice of category, and it can also return a numeric score with a reliability figure attached. The project's authors say it suits routing and checks inside agent workflows, and is not meant for coding, chat or summarising.

What Strands Decider 2B does

• Option selection: picks one answer from the options given in the prompt.
• Scoring: returns a numeric score with a reliability figure for each answer.
• Local running: the project says it runs on a local CPU or GPU, with answers in tens of milliseconds.
• Open code: weights are on Hugging Face under Apache 2.0, and the code, training data and scripts are on GitHub so results can be reproduced.

Who it works with

Developers building agent workflows that need fast routing and checks.

Key facts

• Base model: Qwen 3.5 2B, with its text-generation head removed and a pointer head added
• Licence: Apache 2.0
• Authors: Marc Brooker, Mike Chambers and Fabio Nonato de Paula

The accuracy and calibration figures are the authors' own measurements.