TheTechno Optimist.

OLMoAI2 (Allen Institute for AI)—AI2 announces OLMo 3: first fully open thinking model family from 7B to 32B

AI2 (Allen Institute for AI)

OLMo, open-weight reasoning models, AI research nonprofit

USprivateest. 2014allenai.org (opens allenai.org)Checked 10 Oct

The brief

Analyst view
  • Paul Allen's nonprofit pursuit of AI research as a public good, operating since 2014 with teams in Seattle and Tel Aviv.
  • OLMo 3, released November 2025, is the first fully open 32B thinking model with 65,536 token context window, trained on Dolma 3 corpus.
  • Ai2 provides complete source transparency: weights, training code, datasets and checkpoints under Apache 2.0 license.

Technical approach

As reported
Open source

Complete transparency

Weights, training code, data and checkpoints all published. No proprietary components.

Dolma corpus

Training on curated public data

OLMo models train on Dolma, an open corpus of internet text. Dolma 3 adds curated scientific and technical content.

Thinking models

Step-by-step reasoning

OLMo 3 32B Think generates explicit reasoning chains for complex logic and instruction-following.

Primer