Castform
AssessTools
An RL post-training system for teaching models agentic search and retrieval tasks.
Why it's here
Placed in Assess: 1 article(s) of evidence from 1 source(s), led by research-stage coverage, with 1 in the last 30 days. Confidence 24%. Low accumulated evidence, so it defaults conservatively pending more signal.
Evidence (1)
- 7Hacker News·8/5/2026researchCastform claims 100x cheaper retrieval than GPT-5.6 Sol
Castform says its 4B open-source model, post-trained with RL, can retrieve search results as accurately as GPT-5.6 Sol while costing about 100x less. The company pairs its model training pipeline with Neon’s Lakebase Search and Postgres-based storage to support both training and inference.