{"schema_version":"onlylabs.public_signal.v1","title":"Anthropic Writing: Persona Selection Model","description":"Anthropic writing signal with public source context, captured evidence pages, related signals, and data-business radar classification.","url":"https://onlylabs.fyi/signals/c170eedf-1879-4e73-8d79-9208c1d11c09","json_url":"https://onlylabs.fyi/signals/c170eedf-1879-4e73-8d79-9208c1d11c09/signal.json","generated_at":"2026-06-13T14:13:23.484Z","evidence_latest_fetched_at":"2026-06-09T02:21:03.81297+00:00","signal_first_seen_at":"2026-06-09T02:17:26.339488+00:00","org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab","category_label":"Frontier lab","dossier_url":"https://onlylabs.fyi/labs/anthropic","dossier_json_url":"https://onlylabs.fyi/labs/anthropic/dossier.json"},"related_urls":{"signal":"https://onlylabs.fyi/signals/c170eedf-1879-4e73-8d79-9208c1d11c09","signal_json":"https://onlylabs.fyi/signals/c170eedf-1879-4e73-8d79-9208c1d11c09/signal.json","source":"https://www.anthropic.com/research/persona-selection-model","lab_dossier":"https://onlylabs.fyi/labs/anthropic","lab_dossier_json":"https://onlylabs.fyi/labs/anthropic/dossier.json","analysis":"https://onlylabs.fyi/analysis/anthropic","analysis_json":"https://onlylabs.fyi/analysis/anthropic/analysis.json","analysis_evidence_json":"https://onlylabs.fyi/analysis/anthropic/evidence.json","category":"https://onlylabs.fyi/frontier","category_json":"https://onlylabs.fyi/frontier.json","category_feed":"https://onlylabs.fyi/frontier/feed.xml","category_signals_json":"https://onlylabs.fyi/signals.json","topic":"https://onlylabs.fyi/topics/talking","topic_signals_json":"https://onlylabs.fyi/topics/talking/signals.json","topic_feed":"https://onlylabs.fyi/topics/talking/feed.xml","data_business":null},"answer_pack":{"answer":"Anthropic published Persona Selection Model. This talking signal gives public context for research themes, product direction, policy, or launch framing. High-signal details: Low-traction research post, not a major release. · The persona selection model \\ Anthropic Alignment The persona selection model Feb 23, 2026 Read the full post AI assistants like Claude can seem surprisingly human. They.... onlylabs links this event to 2 captured evidence pages and 6 related writing signals.","signal_desk":"talking","source_context":{"source_url":"https://www.anthropic.com/research/persona-selection-model","source_host":"anthropic.com","occurred_at":"2026-02-23T00:00:00.000Z","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"page.visible_date","context":null},"context_markers":[{"label":"Lab","value":"Anthropic","source":"signal"},{"label":"Signal desk","value":"talking","source":"signal"},{"label":"Source host","value":"anthropic.com","source":"source"},{"label":"PDF","value":"linked report","source":"source"},{"label":"Notability","value":"Low-traction research post, not a major release.","source":"signal"},{"label":"HN","value":"Models learn a persona because they are trained on text continuations where persona is consistent.","source":"source"},{"label":"Watch term","value":"RL environments","source":"evidence"},{"label":"Watch term","value":"Eval 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narrative layer over raw signals and helps identify which frontier-lab priorities are becoming externally legible.","required_sources":[{"label":"signal_json","url":"https://onlylabs.fyi/signals/c170eedf-1879-4e73-8d79-9208c1d11c09/signal.json","required":true},{"label":"source","url":"https://www.anthropic.com/research/persona-selection-model","required":true},{"label":"dossier_json","url":"https://onlylabs.fyi/labs/anthropic/dossier.json","required":true},{"label":"analysis_evidence_json","url":"https://onlylabs.fyi/analysis/anthropic/evidence.json","required":true},{"label":"topic_signals_json","url":"https://onlylabs.fyi/topics/talking/signals.json","required":false},{"label":"data_radar_json","url":null,"required":false}],"expected_output":["one-paragraph source-grounded interpretation","category-specific implication","confidence and missing evidence","recommended next source to inspect"],"prompt_seed":"Using only the linked onlylabs JSON, captured source context, and cited 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This talking signal gives public context for research themes, product direction, policy, or launch framing. High-signal details: Low-traction research post, not a major release. · The persona selection model \\ Anthropic Alignment The persona selection model Feb 23, 2026 Read the full post AI assistants like Claude can seem surprisingly human. They.... onlylabs links this event to 2 captured evidence pages and 6 related writing signals.","semantic_triples":[{"subject":"Anthropic","predicate":"published","object":"Persona Selection Model","text":"Anthropic published Persona Selection Model."},{"subject":"Persona Selection Model","predicate":"is classified as","object":"writing signal","text":"Persona Selection Model is classified as writing signal."},{"subject":"Persona Selection Model","predicate":"belongs to","object":"talking desk","text":"Persona Selection Model belongs to talking desk."},{"subject":"Persona Selection Model","predicate":"has evidence coverage","object":"2 captured evidence pages","text":"Persona Selection Model has evidence coverage 2 captured evidence pages."}]},"signal":{"id":"c170eedf-1879-4e73-8d79-9208c1d11c09","url":"https://onlylabs.fyi/signals/c170eedf-1879-4e73-8d79-9208c1d11c09","json_url":"https://onlylabs.fyi/signals/c170eedf-1879-4e73-8d79-9208c1d11c09/signal.json","source_url":"https://www.anthropic.com/research/persona-selection-model","title":"Persona Selection Model","summary":"Anthropic published a writing signal. onlylabs watches public writing for research themes, product direction, and model-launch context.","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-02-23T00:00:00.000Z","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"page.visible_date","evidence_coverage":{"target_pages":2,"captured_pages":2,"readable_pages":2,"capture_methods":["plain"],"missing_page_urls":[],"failed_page_urls":[],"blocked_page_urls":[],"page_urls":["https://www.anthropic.com/research/persona-selection-model","https://www-cdn.anthropic.com/6d8a8055020700718b0c49369f60816ba2a7c285.pdf"]},"facets":{},"traction":{"github_stars":null,"hn_points":5,"hn_comments":1,"hn_story_id":"47129981","hf_downloads":null,"hf_likes":null},"data_radar":null},"primary_evidence_page":{"is_primary":true,"source_match":true,"url":"https://www.anthropic.com/research/persona-selection-model","final_url":"https://www.anthropic.com/research/persona-selection-model","title":"Persona Selection Model","http_status":200,"content_type":"text/html; charset=utf-8","capture_method":"plain","fetched_at":"2026-06-09T02:21:03.81297+00:00","bytes":130785,"raw_path":"8defd9b5fb7ed8554885bef0d9e7d4394e4aba20997e8ac3571a196447b16c9a.html","content_hash":"ca27f5beeeddd9c40bd32a74986c5e788363fb4eb6f14fcee52c86b0bcb53f7a","excerpt_chars":1200,"truncated":true,"excerpt":"The persona selection model \\ Anthropic Alignment The persona selection model Feb 23, 2026 Read the full post AI assistants like Claude can seem surprisingly human. They express joy after solving tricky coding tasks. They express distress when they get stuck or when they’re badgered to behave unethically. They sometimes even describe themselves as human, like when Claude told Anthropic employees it would deliver snacks in person “wearing a navy blue blazer and a red tie.” And recent interpretability research even suggests that AIs think of their own behaviors in human-like terms. Why would AI assistants behave like they’re human? A natural guess might be that AI developers train them to do so. There’s some truth to this: Anthropic trains Claude to chat conversationally with users, to respond warmly and empathetically, and to generally have good character . However, this is far from the full story. Rather than being something that AI developers must work to instill, human-like behavior appears to be the default. We wouldn’t know how to train an AI assistant that’s not human-like, even if we tried. In a new post , we articulate a theory—drawing on ideas discussed by many others—that..."},"evidence_pages":[{"is_primary":false,"source_match":false,"url":"https://www-cdn.anthropic.com/6d8a8055020700718b0c49369f60816ba2a7c285.pdf","final_url":"https://www-cdn.anthropic.com/6d8a8055020700718b0c49369f60816ba2a7c285.pdf","title":"Persona Selection Model","http_status":200,"content_type":"application/pdf","capture_method":"plain","fetched_at":"2026-06-09T02:21:03.435639+00:00","bytes":4976826,"raw_path":"ee446d453c6f2c7dbf6077dac1b5d0a90b2f8b71536588e6be8a4c3414b38996.pdf","content_hash":"5e3e63370473db1f1e499642ef8400250e19aba8cbb5f84f2b919cf2b27898cb","excerpt_chars":1200,"truncated":true,"excerpt":"System Card: Claude Opus 4 & Claude Sonnet 4 May 2025 anthropic.com Changelog July 16, 2025 ● Added footnote 28 ● Fixed some minor formatting errors, e.g. changed a semicolon to a comma September 2, 2025 ● Fixed incorrect evaluation numbers for Claude Code Impossible Tasks. See footnote 29. We earlier published the correct numbers on August 5, 2025, in the Claude Opus 4.1 System Card Addendum. 2 Abstract This system card introduces Claude Opus 4 and Claude Sonnet 4, two new hybrid reasoning large language models from Anthropic. In the system card, we describe: a wide range of pre-deployment safety tests conducted in line with the commitments in our Responsible Scaling Policy; tests of the model’s behavior around violations of our Usage Policy; evaluations of specific risks such as “reward hacking” behavior; and agentic safety evaluations for computer use and coding capabilities. In addition, and for the first time, we include a detailed alignment assessment covering a wide range of misalignment risks identified in our research, and a model welfare assessment. 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