{"type":"post","id":"over-the-last-few-months-we-ve-made-218d38","slug":"over-the-last-few-months-we-ve-made-218d38","title":"Over the last few months, we’ve made significant progress in reducing the effectiveness of distillation attacks against Claude.","description":"Anthropic’s post describes a shift from simple defenses against passive copying to layered controls against organized extraction.","retrieval_nugget":"Anthropic’s post describes a shift from simple defenses against passive copying to layered controls against organized extraction.","published_at":"2026-10-13","updated_at":"2026-10-13","record_date":"2026-10-13","date_kind":"published_at","topics":["anthropic","claude"],"source_urls":["https://www.anthropic.com/research/distillation-defenses"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:over-the-last-few-months-we-ve-made-218d38","status":"published","visuals":[],"editorial_provenance":{"schema_version":"newruntime-editorial-copy-v1","content_status":"source_grounded_final","final_copy_sha256":"sha256:4b6f64eef3e89b5dfdc19e0f99c1266920d2fe05c9d9d581a70293be06f1d74b","reviewed_at":"2026-10-13T02:02:47.747Z","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":2,"related_record_count":0},"analysis":{"schema_version":"newruntime-site-analysis-v1","object_kind":"field_note","thesis":"In model distillation defense, controlling access to reasoning traces and the account pathways around them is becoming as important as filtering individual prompts.","observed_facts":[{"text":"Anthropic says early evidence suggests its new methods reduced data harvested by distillers by around 90–99%.","source_urls":["https://www.anthropic.com/research/distillation-defenses"]},{"text":"Anthropic reports that a model trained on full Claude Opus 4.8 transcripts scored 80.4% on SWE-bench Verified, compared with 71.8% using summarized transcripts.","source_urls":["https://www.anthropic.com/research/distillation-defenses"]},{"text":"The post describes preserved thinking and restrictions on reasoning access across models and organizations.","source_urls":["https://www.anthropic.com/research/distillation-defenses"]}],"mechanism":"Anthropic describes controls on moving protected reasoning across conversations, models, and accounts; detection of attempts to extract hidden reasoning; and measures targeting proxy networks of fraudulent accounts.","why_now":"Anthropic says attackers adapted after transcript summarization, using varied extraction prompts and large networks of fraudulent accounts.","implications":["Defenses can operate across transcript handling, account identity, and cross-model access rather than relying only on prompt-level safeguards.","The controls carry operational costs: Anthropic says it turned away paid traffic and some legitimate users had to update integrations."],"evidence_boundary":"The 90–99% reduction and attack account are Anthropic’s claims; the post does not provide independent validation of that estimate.","watch_conditions":["Whether other model providers disclose comparable controls and independently evaluated reductions in extraction.","Whether integration changes create measurable friction for legitimate API users."],"related_records":[],"new_branch_reason":"No prior New Runtime record on this specific defense change was supplied, so this begins a distinct analytical record without inferring a related record."},"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/over-the-last-few-months-we-ve-made-218d38/","markdown":"https://newruntime.com/posts/over-the-last-few-months-we-ve-made-218d38.md","json":"https://newruntime.com/posts/over-the-last-few-months-we-ve-made-218d38.json"},"next_reads":[{"type":"topic","path":"/topics/anthropic/","url":"https://newruntime.com/topics/anthropic/","title":"Anthropic","reason":"Explore the anthropic topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/anthropic.md","json_url":"https://newruntime.com/topics/anthropic.json"},{"type":"topic","path":"/topics/claude/","url":"https://newruntime.com/topics/claude/","title":"Claude","reason":"Explore the claude topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/claude.md","json_url":"https://newruntime.com/topics/claude.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"}]}