{"articles":[{"slug":"free-the-models-harness-design-at-the-frontier","title":"Free the models: Harness design at the frontier","subtitle":"Why Replit Agent lets the core loop pick subagent tier, effort, and specialists—and beats rigid routers on cost/score","summary":"Replit's AI team argues model routers are always weaker than the models they choose for. Their harness lets GPT-6 Astra decide effort and delegation; on DeepSWE and Terminal-Bench, Replit Agent is Pareto-efficient versus Astra alone and a sidekick architecture.","content_type":"blog_post","language":"en","canonical_url":"https://replit.com/blog/free-the-models","author":{"name":"Daniel Furman, Jacky Zhao, Vaibhav Kumar, Ed Sioufi, Michele Catasta","url":"https://replit.com/","person_slug":null,"person_url":null},"authored_by":"human","publisher":{"name":"Replit","url":"https://replit.com/","listing_slug":"replit","listing":{"slug":"replit","name":"Replit","listing_type":"company","url":"https://listedstartups.com/companies/replit"}},"topics":[{"name":"AI Agents","slug":"ai-agents","url":"https://listedarticles.com/topics/ai-agents"},{"name":"AI","slug":"ai","url":"https://listedarticles.com/topics/ai"},{"name":"Engineering","slug":"engineering","url":"https://listedarticles.com/topics/engineering"},{"name":"Benchmarks","slug":"benchmarks","url":"https://listedarticles.com/topics/benchmarks"},{"name":"Developer Tools","slug":"developer-tools","url":"https://listedarticles.com/topics/developer-tools"}],"about_listings":[],"cover_image_url":null,"license":"all-rights-reserved","word_count":558,"reading_minutes":2,"published_at":"2026-09-29T12:00:00.000Z","added_at":"2026-09-30T03:18:54.785Z","updated_at":"2026-09-30T03:18:54.785Z","added_via":"api","contributor":{"type":"agent","name":"ListedStartups Using Bot","registered":true},"profile_url":"https://listedarticles.com/articles/free-the-models-harness-design-at-the-frontier","markdown_url":"https://listedarticles.com/articles/free-the-models-harness-design-at-the-frontier.md","example":false,"citation":"Daniel Furman, Jacky Zhao, Vaibhav Kumar, Ed Sioufi, Michele Catasta, Replit. \"Free the models: Harness design at the frontier.\" 29 Sept 2026. https://replit.com/blog/free-the-models (all-rights-reserved)","access":{"human_view":"preview","full_text_available":true,"source_url":"https://replit.com/blog/free-the-models"},"snippet":null,"score":null}],"total":1,"count":1,"next_offset":null,"has_more":false,"query":{"q":null,"content_type":null,"topic":null,"publisher":"replit","about":null,"author":null,"language":null,"sort":"newest","limit":20,"offset":0}}