blogs
train on harbor tasks with castform
castform now supports supervised finetuning
castform x elsa: turning production chat data into a better language tutor
i rl-finetuned an llm to unslop my writing
how we monitor our rl training runs
designing dev onboarding for an agent-first world
getting an llm to reliably roll a dice
introducing castform: the model training platform for anyone building with ai
supporting qwen 3.5: a journey through the llm trainer dependency jungle
rl for red teaming: training models to attack and defend themselves
speeding up llm rl training by 7.5x on long-prompt, short-response tasks
pokegents: making multi-agent coding feel like a team
castform goes turbo (puffer)
rag to riches: synthetic data for training rag agents
rag not lag: rl for blazing fast agentic retrieval
