"AREX-2 is a 27B-parameter long-horizon agent model from the Beijing Academy of Artificial Intelligence (BAAI). It learns to improve a solution over multiple test-time rounds: propose, measure, reflect, and revise.

AREX-2 is trained on machine-learning and algorithmic-programming tasks with verifiable feedback, together with the existing AREX deep-research data. The learned self-improvement behavior transfers to deep research without adding new search trajectories.

• Architecture: Dense Qwen3.8-compatible multimodal model
• Parameters: 27B
• Context length: 262,144 tokens

[](https://huggingface.co/BAAI/AREX-2#key-features)Key features

• Long-horizon self-improvement: turns extra test-time rounds into useful solution refinement.
• Feedback-driven reflection: reads scores, logs, errors, and timings to decide what to change next.
• Cross-domain performance: training on coding and machine-learning tasks also improves the model's deep-research performance.
• Long-horizon reasoning: sustains productive iteration as the task budget grows."

Gguf's - https://huggingface.co/mradermacher/AREX-2-GGUF