Castform
About
Castform is a managed RL post-training platform for adapting open-weight models to proprietary tasks and data. Its workflow covers data and trace ingestion, synthetic dataset generation, environment and reward design, local validation, managed GPU training, rollout inspection, evaluation against baselines, checkpoint export, and OpenAI-compatible serving. The open-source benchmax SDK exposes environments, tools, rewards, datasets, and sandbox integrations as code for teams that need deeper control.
What They Offer
Commercial or operational services this company provides.
Products & Public Artifacts
Managed platform for data preparation, RL or SFT post-training, GPU orchestration, training observability, and deployment.
Visit artifact →Open-source Python SDK for defining RL environments, tools, rewards, datasets, and training workflows as code.
Visit artifact →Technical Capabilities
Only publicly documented capabilities are shown. Absence does not imply the capability is unavailable.