{"type":"post","id":"simular-s-agent-s4-evolves-agent-interfaces-so-0ce52b","slug":"simular-s-agent-s4-evolves-agent-interfaces-so-0ce52b","title":"Simular's Agent S4 evolves agent interfaces so Qwen3.8-27B tops open-source results on OSWorld V2","description":"Simular has published Agent S4, an “agent scientist” that changes the interfaces available to a computer-use agent rather than changing the task model or its harness.","retrieval_nugget":"Simular has published Agent S4, an “agent scientist” that changes the interfaces available to a computer-use agent rather than changing the task model or its harness.","published_at":"2026-10-23","updated_at":"2026-10-23","record_date":"2026-10-23","date_kind":"published_at","topics":["agent-interfaces"],"entities":["Simular","Agent S4","Qwen3.8-27B","OSWorld V2","ScienceBoard","GPT-5.5","Claude Opus 4.8"],"related_patterns":["harness-architecture-outlives-model-choice","agent-ready-software-exposes-capabilities"],"novelty_label":"new_fact","what_changed":"Simular’s Agent S4 research adds a benchmark result: Qwen3.8-27B tops open-source results on OSWorld V2.","prior_refs":["memory:20fca537-5239-8e06-a6b5-bd8b3932b8ce","memory:fe8a7558-ad81-8aa7-ac8d-b068b19143b3"],"source_url":"https://www.simular.ai/articles/agent-s4-evolving-the-interfaces-computer-use-agents-work-throughagen","source_urls":["https://www.simular.ai/articles/agent-s4-evolving-the-interfaces-computer-use-agents-work-throughagen"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:simular-s-agent-s4-evolves-agent-interfaces-so-0ce52b","status":"published","visuals":[],"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/posts/simular-s-agent-s4-evolves-agent-interfaces-so-0ce52b/","markdown":"https://newruntime.com/posts/simular-s-agent-s4-evolves-agent-interfaces-so-0ce52b.md","json":"https://newruntime.com/posts/simular-s-agent-s4-evolves-agent-interfaces-so-0ce52b.json"},"next_reads":[{"type":"topic","path":"/topics/agent-interfaces/","url":"https://newruntime.com/topics/agent-interfaces/","title":"Agent Interfaces","reason":"Explore the agent-interfaces topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/agent-interfaces.md","json_url":"https://newruntime.com/topics/agent-interfaces.json"},{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}