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Allen Institute for AI (Ai2)·Nov 20, 2025·v3.1·open source

Olmo-3.1 32B Think

Olmo-3.1 32B Think is a high-performance 32-billion-parameter language model specialized for complex reasoning, multi-step logic, and advanced chain-of-thought processing. As an open-science model, it provides full transparency into its training data, code, and methodology, making it a powerful resource for researchers and developers in fields like mathematics and programming.

open-sourcellmreasoningai2
overview

Olmo-3.1 32B Think is a high-performance 32-billion-parameter language model specialized for complex reasoning, multi-step logic, and advanced chain-of-thought processing. As an open-science model, it provides full transparency into its training data, code, and methodology, making it a powerful resource for researchers and developers in fields like mathematics and programming.

key features
  • 01Advanced chain-of-thought reasoning with verifiable internal steps
  • 0264,536 token context window for long-horizon tasks
  • 03Optimized performance for mathematics, coding, and instruction-following
  • 04Full transparency regarding training data (Dolma 3) and model checkpoints
  • 05Apache 2.0 licensed for research and educational use
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