{"type":"post","id":"stackness-reanalysis-retrying-bare-gpt-6-luna-costs-684ccf","slug":"stackness-reanalysis-retrying-bare-gpt-6-luna-costs-684ccf","title":"Stackness reanalysis: retrying bare GPT-6 Luna costs about the same as harnessing it, and harness build cost was never measured","description":"Stackness reanalysed a one-task coding-agent experiment comparing GPT-6 Luna with GPT-6 Sol.","retrieval_nugget":"Stackness reanalysed a one-task coding-agent experiment comparing GPT-6 Luna with GPT-6 Sol. The headline cost advantage of a task-specific behavioral harness becomes much less decisive when bare Luna retries are priced by successful outcomes, while the cost of creating and maintaining the harness was not measured.","published_at":"2026-10-28","updated_at":"2026-10-28","record_date":"2026-10-28","date_kind":"published_at","topics":["codex"],"entities":["Stackness","GPT-6 Luna","GPT-6 Sol","Codex","Naresh Jain","Specmatic","OpenAI"],"related_patterns":["harness-architecture-outlives-model-choice","agent-economics-moves-to-completed-work","verification-bandwidth-is-the-scarce-resource"],"novelty_label":"new_fact","what_changed":"Stackness adds a reanalysis: retrying bare Luna costs about as much as harnessing it, and the harness’s build cost was not measured.","prior_refs":["memory:3374a02a-dee9-87a4-a3ee-b5e3b1a77fb7"],"source_url":"https://stackness.dev/blog/does-a-harness-make-a-cheap-model-as-reliable-as-a-frontier-model","source_urls":["https://stackness.dev/blog/does-a-harness-make-a-cheap-model-as-reliable-as-a-frontier-model"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:stackness-reanalysis-retrying-bare-gpt-6-luna-costs-684ccf","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/stackness-reanalysis-retrying-bare-gpt-6-luna-costs-684ccf/","markdown":"https://newruntime.com/posts/stackness-reanalysis-retrying-bare-gpt-6-luna-costs-684ccf.md","json":"https://newruntime.com/posts/stackness-reanalysis-retrying-bare-gpt-6-luna-costs-684ccf.json"},"next_reads":[{"type":"topic","path":"/topics/codex/","url":"https://newruntime.com/topics/codex/","title":"Codex","reason":"Explore the codex topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/codex.md","json_url":"https://newruntime.com/topics/codex.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"}]}