A big announcement from Lexsi Labs: Lexsi Labs (@Lexsi_labs) , Cohere Labs (@cohere ) and Hugging Face(@huggingface) are partnering on the Lexsi AI Safety and Alignment Hackathon, one of the biggest hackathon on post-training and AI Safety & Alignment. Nov 1 to 21, 2026. Online, free, open to builders worldwide. Teams build real post-training pipelines: - Models: open-weights Tiny Aya and Aya Expanse from Cohere Labs - Tooling: six open-source Lexsi Labs toolkits (AlignTune, CuratorKIT, AuditKIT, SafeTune, CircuitKIT, AgentTune) - Artifacts: models, adapters, logs and datasets hosted on Hugging Face Three tracks: fine-tuning and data curation, AI red teaming and safety, agentic fine-tuning. Each submission chains at least two toolkits and reports before-and-after metrics. $30,000+ in prizes and credits, GPU credits for up to 800 teams, Demo Day for the top 20, and interviews at Lexsi Labs for standout builders. Kickoff: Bengaluru, Oct 31, with an online option. Registration starts today at: Thank you to @huggingface and @cohere for building this with us.