{"type":"post","id":"altk-evolve-how-learned-memory-tops-the-2-fae5de","slug":"altk-evolve-how-learned-memory-tops-the-2-fae5de","title":"ALTK-Evolve: How learned memory tops the τ²-bench leaderboard on customer service tasks without a frontier model","description":"**Thesis:** ALTK-Evolve suggests that an agent can improve policy-bound task reliability by converting experience into explicit, reusable behavioral guidance, without changing model weights.","retrieval_nugget":"**Thesis:** ALTK-Evolve suggests that an agent can improve policy-bound task reliability by converting experience into explicit, reusable behavioral guidance, without changing model weights.","published_at":"2026-10-20","updated_at":"2026-10-20","record_date":"2026-10-20","date_kind":"published_at","topics":["memory"],"source_urls":["https://huggingface.co/blog/ibm-research/altk-evolve-bc"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:altk-evolve-how-learned-memory-tops-the-2-fae5de","status":"published","visuals":[],"editorial_provenance":{"schema_version":"newruntime-editorial-copy-v1","content_status":"source_grounded_final","final_copy_sha256":"sha256:833f3806f79c45df59a6c358b5ab790a15afff04bb787cd01fc3469f7fd9a887","reviewed_at":"2026-10-20T16:01:05.267Z","source_evidence_count":1,"verified_claim_count":3,"site_analysis_schema_version":"newruntime-site-analysis-v1","site_object_kind":"field_note","observed_fact_count":3,"implication_count":2,"watch_condition_count":1,"related_record_count":0},"analysis":{"schema_version":"newruntime-site-analysis-v1","object_kind":"field_note","thesis":"ALTK-Evolve suggests that an agent can improve policy-bound task reliability by converting experience into explicit, reusable behavioral guidance, without changing model weights.","observed_facts":[{"text":"IBM Research reports that GPT-4.1 retail Pass⁴ rose from 57.5% to 67.5% on held-out τ²-bench tasks with the full learned guideline set.","source_urls":["https://huggingface.co/blog/ibm-research/altk-evolve-bc"]},{"text":"In an airline test using GPT-5.5, the 103-guideline configuration raised Pass⁴ from 55% to 70%.","source_urls":["https://huggingface.co/blog/ibm-research/altk-evolve-bc"]},{"text":"The guidelines were distilled from training-task attempts and applied unchanged on held-out tasks, according to the article.","source_urls":["https://huggingface.co/blog/ibm-research/altk-evolve-bc"]}],"mechanism":"The method distills behavioral rules from successful and failed training-task trajectories and appends those rules to the agent's system prompt; it does not update model weights.","why_now":"The reported gains also extend to the GPT-5.5 airline setup.","implications":["Teams can test whether distilled procedural rules improve repeatability without fine-tuning.","Guideline volume may need tuning by domain rather than maximizing."],"evidence_boundary":"The reported benchmark results do not establish real-world production impact.","watch_conditions":["Independent tests should check whether the gains persist outside τ²-bench."],"related_records":[],"new_branch_reason":"No prior New Runtime record was supplied; this starts a distinct analytical record focused on learned procedural guidance for customer-service agents and the limits of its benchmark evidence."},"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/altk-evolve-how-learned-memory-tops-the-2-fae5de/","markdown":"https://newruntime.com/posts/altk-evolve-how-learned-memory-tops-the-2-fae5de.md","json":"https://newruntime.com/posts/altk-evolve-how-learned-memory-tops-the-2-fae5de.json"},"related_shifts":["owned-learning-loop"],"next_reads":[{"type":"topic","path":"/topics/memory/","url":"https://newruntime.com/topics/memory/","title":"Memory","reason":"Explore the memory topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/memory.md","json_url":"https://newruntime.com/topics/memory.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"}]}