{"schema_version":"onlylabs.public_signal.v1","title":"Anthropic Writing: Mythos Preview","description":"Anthropic writing signal with public source context, captured evidence pages, related signals, and data-business radar classification.","url":"https://onlylabs.fyi/signals/ef53083e-79ae-4eab-a7ff-de6dff55d5aa","json_url":"https://onlylabs.fyi/signals/ef53083e-79ae-4eab-a7ff-de6dff55d5aa/signal.json","generated_at":"2026-06-26T23:16:19.224Z","evidence_latest_fetched_at":"2026-06-17T20:04:15.615+00:00","signal_first_seen_at":"2026-06-17T20:00:31.646229+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/ef53083e-79ae-4eab-a7ff-de6dff55d5aa","signal_json":"https://onlylabs.fyi/signals/ef53083e-79ae-4eab-a7ff-de6dff55d5aa/signal.json","source":"https://www.anthropic.com/research/mythos-preview","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 Mythos Preview. This talking signal gives public context for research themes, product direction, policy, or launch framing. High-signal details: Anthropic preview of new system, lacks traction data. · NISTIR 8105 Report on Post-Quantum Cryptography Lily Chen Stephen Jordan Yi-Kai Liu Dustin Moody Rene Peralta Ray Perlner Daniel Smith-Tone This publication is available.... onlylabs links this event to 4 captured evidence pages and 6 related writing signals.","signal_desk":"talking","source_context":{"source_url":"https://www.anthropic.com/research/mythos-preview","source_host":"anthropic.com","occurred_at":"2026-04-07T00:00:00.000Z","first_seen_at":"2026-06-17T20:00:31.646229+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":"Anthropic preview of new system, lacks traction data.","source":"signal"},{"label":"Watch 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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/ef53083e-79ae-4eab-a7ff-de6dff55d5aa/signal.json","required":true},{"label":"source","url":"https://www.anthropic.com/research/mythos-preview","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 evidence, analyze Anthropic's writing signal \"Mythos Preview\" for frontier lab strategy."},"semantic_triples":[{"subject":"Anthropic","predicate":"published","object":"Mythos Preview","text":"Anthropic published Mythos Preview."},{"subject":"Mythos Preview","predicate":"is classified as","object":"writing signal","text":"Mythos Preview is classified as writing signal."},{"subject":"Mythos Preview","predicate":"belongs to","object":"talking desk","text":"Mythos Preview belongs to talking desk."},{"subject":"Mythos Preview","predicate":"has evidence coverage","object":"4 captured evidence pages","text":"Mythos Preview has evidence coverage 4 captured evidence pages."},{"subject":"Mythos Preview","predicate":"has captured page count","object":"4","text":"Mythos Preview has captured page count 4."},{"subject":"Mythos Preview","predicate":"has readable page count","object":"4","text":"Mythos Preview has readable page count 4."},{"subject":"Mythos Preview","predicate":"has related signal 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This talking signal gives public context for research themes, product direction, policy, or launch framing. High-signal details: Anthropic preview of new system, lacks traction data. · NISTIR 8105 Report on Post-Quantum Cryptography Lily Chen Stephen Jordan Yi-Kai Liu Dustin Moody Rene Peralta Ray Perlner Daniel Smith-Tone This publication is available.... onlylabs links this event to 4 captured evidence pages and 6 related writing signals.","semantic_triples":[{"subject":"Anthropic","predicate":"published","object":"Mythos Preview","text":"Anthropic published Mythos Preview."},{"subject":"Mythos Preview","predicate":"is classified as","object":"writing signal","text":"Mythos Preview is classified as writing signal."},{"subject":"Mythos Preview","predicate":"belongs to","object":"talking desk","text":"Mythos Preview belongs to talking desk."},{"subject":"Mythos Preview","predicate":"has evidence coverage","object":"4 captured evidence pages","text":"Mythos Preview has evidence coverage 4 captured evidence pages."}]},"signal":{"id":"ef53083e-79ae-4eab-a7ff-de6dff55d5aa","url":"https://onlylabs.fyi/signals/ef53083e-79ae-4eab-a7ff-de6dff55d5aa","json_url":"https://onlylabs.fyi/signals/ef53083e-79ae-4eab-a7ff-de6dff55d5aa/signal.json","source_url":"https://www.anthropic.com/research/mythos-preview","title":"Mythos Preview","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":"2026-04-07T00:00:00.000Z","first_seen_at":"2026-06-17T20:00:31.646229+00:00","date_source":"page.visible_date","evidence_coverage":{"target_pages":4,"captured_pages":4,"readable_pages":4,"capture_methods":["exa","plain"],"missing_page_urls":[],"failed_page_urls":[],"blocked_page_urls":[],"page_urls":["https://www.anthropic.com/research/mythos-preview","https://www.usenix.org/system/files/1311_05-08_mickens.pdf","https://www.usenix.org/system/files/usenixsecurity23-vasquez_1.pdf","https://nvlpubs.nist.gov/nistpubs/ir/2016/nist.ir.8105.pdf"]},"facets":{},"traction":{"github_stars":null,"hn_points":null,"hn_comments":null,"hn_story_id":null,"hf_downloads":null,"hf_likes":null},"data_radar":null},"primary_evidence_page":{"is_primary":true,"source_match":true,"url":"https://www.anthropic.com/research/mythos-preview","final_url":"https://www.anthropic.com/research/mythos-preview","title":"Mythos Preview","http_status":200,"content_type":"text/html; charset=utf-8","capture_method":"plain","fetched_at":"2026-06-17T20:04:02.044875+00:00","bytes":434531,"raw_path":"95b7e4c31688fac7ba9a5888cee88c83746177e75da7517397bea70235387956.html","content_hash":"2f2c845270dbbbd1b1a4ff0a8320121773662bfd48fc1db6632c896668cd3555","excerpt_chars":1200,"truncated":true,"excerpt":"Assessing Claude Mythos Preview’s cybersecurity capabilities \\ Anthropic Frontier Red Team Assessing Claude Mythos Preview’s cybersecurity capabilities Apr 7, 2026 Nicholas Carlini, Newton Cheng, Keane Lucas, Michael Moore, Milad Nasr, Vinay Prabhushankar, Winnie Xiao Hakeem Angulu, Evyatar Ben Asher, Jackie Bow, Keir Bradwell, Ben Buchanan, David Forsythe, Daniel Freeman, Alex Gaynor, Xinyang Ge, Logan Graham, Kyla Guru, Hasnain Lakhani, Matt McNiece, Mojtaba Mehrara, Renee Nichol, Adnan Pirzada, Sophia Porter, Andreas Terzis, Kevin Troy Earlier today we announced Claude Mythos Preview , a new general-purpose language model. This model performs strongly across the board, but it is strikingly capable at computer security tasks. In response, we have launched Project Glasswing, an effort to use Mythos Preview to help secure the world’s most critical software, and to prepare the industry for the practices we all will need to adopt to keep ahead of cyberattackers. This blog post provides technical details for researchers and practitioners who want to understand exactly how we have been testing this model, and what we have found over the past month. We hope this will show why we view..."},"evidence_pages":[{"is_primary":false,"source_match":false,"url":"https://nvlpubs.nist.gov/nistpubs/ir/2016/nist.ir.8105.pdf","final_url":"https://nvlpubs.nist.gov/nistpubs/ir/2016/nist.ir.8105.pdf","title":"Mythos Preview","http_status":200,"content_type":"application/pdf","capture_method":"exa","fetched_at":"2026-06-17T20:04:15.615+00:00","bytes":199673,"raw_path":"bb22663377f2efff3978da6cccdc9442a2daba551abd3c32fbc1f9afb358ad38.pdf","content_hash":"da3c1c6915e4043131a901d487c7a06de3b88d2e05ffe8a083e800f4e752559a","excerpt_chars":1200,"truncated":true,"excerpt":"NISTIR 8105 Report on Post-Quantum Cryptography Lily Chen Stephen Jordan Yi-Kai Liu Dustin Moody Rene Peralta Ray Perlner Daniel Smith-Tone This publication is available free of charge from: http://dx.doi.org/10.6028/NIST.IR.8105 NISTIR 8105 Report on Post-Quantum Cryptography Lily Chen Stephen Jordan Yi-Kai Liu Dustin Moody Rene Peralta Ray Perlner Daniel Smith-Tone Computer Security Division Applied and Computational Mathematics Division Information Technology Laboratory This publication is available free of charge from: http://dx.doi.org/10.6028/NIST.IR.8105 April 2016 U.S. Department of Commerce Penny Pritzker, Secretary National Institute of Standards and Technology Willie May, Under Secretary of Commerce for Standards and Technology and Director National Institute of Standards and Technology Internal Report 8105 15 pages (April 2016) This publication is available free of charge from: http://dx.doi.org/10.6028/NIST.IR.8105 Certain commercial entities, equipment, or materials may be identified in this document in order to describe an experimental procedure or concept adequately. Such identification is not intended to imply recommendation or endorsement by NIST, nor is it..."},{"is_primary":false,"source_match":false,"url":"https://www.usenix.org/system/files/1311_05-08_mickens.pdf","final_url":"https://www.usenix.org/system/files/1311_05-08_mickens.pdf","title":"Mythos Preview","http_status":200,"content_type":"application/pdf","capture_method":"exa","fetched_at":"2026-06-17T20:04:15.436+00:00","bytes":302291,"raw_path":"a314bbe1fa6febea0f9700d15fa8b5f78eef017bdf2b235a71350c91414accde.pdf","content_hash":"275dcf9e3231a2a705d0d62df7544fb558407411584b1ddfcc6d58e83d4512dd","excerpt_chars":1200,"truncated":true,"excerpt":"| NOVEMBER 2013 | WWW.us enix.org PAGE 5 The Night Watch James M ickens A s a highly trained academic researcher, I spend a lot of time trying to advance the frontiers of human knowledge. However, as someone who was born in the South, I secretly believe that true progress is a fantasy, and that I need to prepare for the end times, and for the chickens coming home to roost, and fast zombies, and slow zombies, and the polite zombies who say “sir” and “ma’am” but then try to eat your brain to acquire your skills. When the revolution comes, I need to be prepared; thus, in the quiet moments, when I’m not producing incredible scientific breakthroughs, I think about what I’ll do when the weather forecast inevitably becomes RIVERS OF BLOOD ALL DAY EVERY DAY. The main thing that I ponder is who will be in my gang, because the likelihood of post-apocalyptic survival is directly related to the size and quality of your rag-tag group of associates. There are some obvious people who I’ll need to recruit: a locksmith (to open doors); a demolitions expert (for when the locksmith has run out of ideas); and a person who can procure, train, and then throw snakes at my enemies (because, in a world..."},{"is_primary":false,"source_match":false,"url":"https://www.usenix.org/system/files/usenixsecurity23-vasquez_1.pdf","final_url":"https://www.usenix.org/system/files/usenixsecurity23-vasquez_1.pdf","title":"Mythos Preview","http_status":200,"content_type":"application/pdf","capture_method":"exa","fetched_at":"2026-06-17T20:04:15.409+00:00","bytes":1875482,"raw_path":"5f22bd1d2d33d2d8e8ba5aa98031cc354474be944357e87b01dff84b8660a7d1.pdf","content_hash":"46416966a78f4538c06ff986801c9707237a584c1cb109511d92a373384722e4","excerpt_chars":1200,"truncated":true,"excerpt":"This paper is included in the Proceedings of the 32nd USENIX Security Symposium. August 9–11, 2023 • Anaheim, CA, USA 978-1-939133-37-3 Open access to the Proceedings of the 32nd USENIX Security Symposium is sponsored by USENIX. The Most Dangerous Codec in the World: Finding and Exploiting Vulnerabilities in H.264 Decoders Willy R. Vasquez, The University of Texas at Austin; Stephen Checkoway, Oberlin College; Hovav Shacham, The University of Texas at Austin https://www.usenix.org/conference/usenixsecurity23/presentation/vasquez The Most Dangerous Codec in the World: Finding and Exploiting Vulnerabilities in H.264 Decoders Willy R. Vasquez The University of Texas at Austin Stephen Checkoway Oberlin College Hovav Shacham The University of Texas at Austin Abstract Modern video encoding standards such as H.264 are a marvel of hidden complexity. But with hidden complexity comes hidden security risk. Decoding video in practice means in teracting with dedicated hardware accelerators and the pro prietary, privileged software components used to drive them. The video decoder ecosystem is obscure, opaque, diverse, highly privileged, largely untested, and highly exposed—a dangerous..."}],"related_signals":[{"id":"9caf7d39-0d96-42d0-8b59-e72f7e502ec4","url":"https://onlylabs.fyi/signals/9caf7d39-0d96-42d0-8b59-e72f7e502ec4","source_url":"https://www.anthropic.com/research/economic-index-june-2026-report","title":"Economic Index June 2026 Report","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-06-26T15:40:57+00:00","first_seen_at":"2026-06-26T16:00:32.297045+00:00","date_source":"sitemap.lastmod"},{"id":"6c78c028-3ab4-4b33-86f7-d86c8ba9e3ba","url":"https://onlylabs.fyi/signals/6c78c028-3ab4-4b33-86f7-d86c8ba9e3ba","source_url":"https://www.anthropic.com/research/agents-in-biology","title":"Agents In Biology","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-06-08T00:00:00.000Z","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"page.visible_date"},{"id":"e4fbfcdd-15b4-41b9-b011-fd83e7068ae9","url":"https://onlylabs.fyi/signals/e4fbfcdd-15b4-41b9-b011-fd83e7068ae9","source_url":"https://www.anthropic.com/research/making-claude-a-chemist","title":"Making Claude A Chemist","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-06-05T00:00:00.000Z","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"page.visible_date"},{"id":"b8472bfd-c32b-4d72-ae98-d8a4f1a1278f","url":"https://onlylabs.fyi/signals/b8472bfd-c32b-4d72-ae98-d8a4f1a1278f","source_url":"https://www.anthropic.com/research/exploit","title":"Exploit","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-03-06T00:00:00.000Z","first_seen_at":"2026-06-17T20:00:31.646229+00:00","date_source":"page.visible_date"},{"id":"5f0f346c-0718-4d81-a174-d18cae51efa3","url":"https://onlylabs.fyi/signals/5f0f346c-0718-4d81-a174-d18cae51efa3","source_url":"https://www.anthropic.com/research/critical-infrastructure-defense","title":"Critical Infrastructure Defense","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-01-08T00:00:00.000Z","first_seen_at":"2026-06-17T20:00:31.646229+00:00","date_source":"page.visible_date"},{"id":"b8ad5d26-1905-4d23-a2e0-c2c477cbb462","url":"https://onlylabs.fyi/signals/b8ad5d26-1905-4d23-a2e0-c2c477cbb462","source_url":"https://www.anthropic.com/news/core-views-on-ai-safety","title":"Core Views On Ai Safety","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2023-03-08T00:00:00.000Z","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"page.visible_date"}]}