{"schema_version":"onlylabs.public_signal.v1","title":"Anthropic Writing: Claude Sonnet 5","description":"Anthropic writing signal with public source context, captured evidence pages, related signals, and data-business radar classification.","url":"https://onlylabs.fyi/signals/df09ac75-ce6c-4552-9507-e0b298b5b6c0","json_url":"https://onlylabs.fyi/signals/df09ac75-ce6c-4552-9507-e0b298b5b6c0/signal.json","generated_at":"2026-07-26T22:27:36.148Z","evidence_latest_fetched_at":"2026-07-01T00:02:36.157+00:00","signal_first_seen_at":"2026-06-30T20:01:40.551126+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/df09ac75-ce6c-4552-9507-e0b298b5b6c0","signal_json":"https://onlylabs.fyi/signals/df09ac75-ce6c-4552-9507-e0b298b5b6c0/signal.json","source":"https://www.anthropic.com/news/claude-sonnet-5","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 Claude Sonnet 5. This talking signal gives public context for research themes, product direction, policy, or launch framing. High-signal details: Flagship model release with strong HN traction. · System Card: Claude Sonnet 5 June 30, 2026 **anthropic.com** * * * Executive summary This system card describes Claude Sonnet 5, the latest model in Anthropic’s Sonnet.... 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/news/claude-sonnet-5","source_host":"anthropic.com","occurred_at":"2026-06-30T00:00:00.000Z","first_seen_at":"2026-06-30T20:01:40.551126+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":"Flagship model release with strong HN traction.","source":"signal"},{"label":"HN","value":"Disappointment 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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/df09ac75-ce6c-4552-9507-e0b298b5b6c0/signal.json","required":true},{"label":"source","url":"https://www.anthropic.com/news/claude-sonnet-5","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 \"Claude Sonnet 5\" for frontier lab strategy."},"semantic_triples":[{"subject":"Anthropic","predicate":"published","object":"Claude Sonnet 5","text":"Anthropic published Claude Sonnet 5."},{"subject":"Claude Sonnet 5","predicate":"is classified as","object":"writing signal","text":"Claude Sonnet 5 is classified as writing signal."},{"subject":"Claude Sonnet 5","predicate":"belongs to","object":"talking desk","text":"Claude Sonnet 5 belongs to talking desk."},{"subject":"Claude Sonnet 5","predicate":"has evidence coverage","object":"2 captured evidence pages","text":"Claude Sonnet 5 has evidence coverage 2 captured evidence pages."},{"subject":"Claude Sonnet 5","predicate":"has captured page count","object":"2","text":"Claude Sonnet 5 has captured page count 2."},{"subject":"Claude Sonnet 5","predicate":"has readable page count","object":"2","text":"Claude Sonnet 5 has readable page count 2."},{"subject":"Claude Sonnet 5","predicate":"has related signal 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Infrastructure."}]},"intelligence":{"signal_desk":"talking","answer":"Anthropic published Claude Sonnet 5. This talking signal gives public context for research themes, product direction, policy, or launch framing. High-signal details: Flagship model release with strong HN traction. · System Card: Claude Sonnet 5 June 30, 2026 **anthropic.com** * * * Executive summary This system card describes Claude Sonnet 5, the latest model in Anthropic’s Sonnet.... onlylabs links this event to 2 captured evidence pages and 6 related writing signals.","semantic_triples":[{"subject":"Anthropic","predicate":"published","object":"Claude Sonnet 5","text":"Anthropic published Claude Sonnet 5."},{"subject":"Claude Sonnet 5","predicate":"is classified as","object":"writing signal","text":"Claude Sonnet 5 is classified as writing signal."},{"subject":"Claude Sonnet 5","predicate":"belongs to","object":"talking desk","text":"Claude Sonnet 5 belongs to talking desk."},{"subject":"Claude Sonnet 5","predicate":"has evidence coverage","object":"2 captured evidence pages","text":"Claude Sonnet 5 has evidence coverage 2 captured evidence pages."}]},"signal":{"id":"df09ac75-ce6c-4552-9507-e0b298b5b6c0","url":"https://onlylabs.fyi/signals/df09ac75-ce6c-4552-9507-e0b298b5b6c0","json_url":"https://onlylabs.fyi/signals/df09ac75-ce6c-4552-9507-e0b298b5b6c0/signal.json","source_url":"https://www.anthropic.com/news/claude-sonnet-5","title":"Claude Sonnet 5","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":"2026-06-30T00:00:00.000Z","first_seen_at":"2026-06-30T20:01:40.551126+00:00","date_source":"page.visible_date","evidence_coverage":{"target_pages":2,"captured_pages":2,"readable_pages":2,"capture_methods":["firecrawl","plain"],"missing_page_urls":[],"failed_page_urls":[],"blocked_page_urls":[],"page_urls":["https://www.anthropic.com/news/claude-sonnet-5","https://www-cdn.anthropic.com/9e6a1044980d8c4ed85669faf9c2a8342e2e9f1e/Claude%20Sonnet%205%20System%20Card.pdf"]},"facets":{},"traction":{"github_stars":null,"hn_points":501,"hn_comments":262,"hn_story_id":"48736605","hf_downloads":null,"hf_likes":null},"data_radar":null},"primary_evidence_page":{"is_primary":true,"source_match":true,"url":"https://www.anthropic.com/news/claude-sonnet-5","final_url":"https://www.anthropic.com/news/claude-sonnet-5","title":"Claude Sonnet 5","http_status":200,"content_type":"text/html; charset=utf-8","capture_method":"plain","fetched_at":"2026-06-30T20:03:04.432977+00:00","bytes":212538,"raw_path":"4307222bc7e5f2e471152174bb7c460b9a7d74b4becbb1e59011c7ac18dd09e6.html","content_hash":"45d69653b0701ed9c8953f359a06e97a746d11c31ea509e8689c6cdeb52b9881","excerpt_chars":1200,"truncated":true,"excerpt":"Introducing Claude Sonnet 5 \\ Anthropic Product Introducing Claude Sonnet 5 Jun 30, 2026 Claude Sonnet 5 is built to be the most agentic Sonnet model yet. It can make plans, use tools like browsers and terminals, and run autonomously at a level that, just a few months ago, required larger and more expensive models. For many developers, the agentic AI era began with Sonnet-class models: Claude Sonnet 3.5, 3.6, and 3.7 were the first models that showed impressive skills in coding and tool use. More recently, though, the clearest gains in agentic capabilities have been in our Opus-class models. Sonnet 5 narrows the gap: its performance is close to that of Opus 4.8, but at lower prices. It’s a substantial improvement over its predecessor, Sonnet 4.6, on important aspects of agentic performance like reasoning, tool use, coding, and knowledge work: Scores for Sonnet 5 on a variety of evaluations compared to those of Sonnet 4.6 and Opus 4.8 (a more generally capable model, for reference). The Claude Sonnet 5 System Card reports a broader set of evaluations in detail. Our safety assessments found that Sonnet 5 shows an overall lower rate of undesirable behaviors than Sonnet 4.6, and is..."},"evidence_pages":[{"is_primary":false,"source_match":false,"url":"https://www-cdn.anthropic.com/9e6a1044980d8c4ed85669faf9c2a8342e2e9f1e/Claude%20Sonnet%205%20System%20Card.pdf","final_url":"https://www-cdn.anthropic.com/9e6a1044980d8c4ed85669faf9c2a8342e2e9f1e/Claude%20Sonnet%205%20System%20Card.pdf","title":"Claude Sonnet 5","http_status":200,"content_type":"application/pdf","capture_method":"firecrawl","fetched_at":"2026-07-01T00:02:36.157+00:00","bytes":11676068,"raw_path":"e9e03b1f0dde2f703aba36e4a8388424b1f8adaf29beb823586e8df513230b96.pdf","content_hash":"0ce49aa473c3037455b45579980fd0b55708c1066df3f5f99f92bb3169d9b9b7","excerpt_chars":1200,"truncated":true,"excerpt":"System Card: Claude Sonnet 5 June 30, 2026 **anthropic.com** * * * Executive summary This system card describes Claude Sonnet 5, the latest model in Anthropic’s Sonnet family. It is an upgrade to Claude Sonnet 4.6, with gains in various aspects of agentic performance. Here, we describe a set of pre-deployment evaluations in the following areas: **Responsible Scaling Policy (RSP) evaluations. Claude Sonnet 5 is our most capable** Sonnet-class model, but it does not advance our capability frontier compared to more capable Opus- or Mythos-class models. We tested its overall level of risk in several areas, as outlined in our RSP. Sonnet 5 poses very low alignment risk, though higher than for previous Sonnet models. On automated AI research & development, we determine that Sonnet 5 does not cross the automated AI R&D capability threshold, being less capable than Claude Mythos 5 on every automated evaluation. On chemical and biological risks, we consider Sonnet 5’s uplift of threat actors who otherwise lack the ability to develop such weapons to be limited (with uncertainty about the extent to which weapons development by threat actors with existing expertise may be accelerated)...."}],"related_signals":[{"id":"02d3865b-27dd-430e-9a7b-19731f2c6a68","url":"https://onlylabs.fyi/signals/02d3865b-27dd-430e-9a7b-19731f2c6a68","source_url":"https://www.anthropic.com/research/project-pilot","title":"Project Pilot","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-07-24T15:38:58+00:00","first_seen_at":"2026-07-24T16:00:49.432854+00:00","date_source":"sitemap.lastmod"},{"id":"03a6b625-8bfd-4013-aeb9-01cd9d54c1a2","url":"https://onlylabs.fyi/signals/03a6b625-8bfd-4013-aeb9-01cd9d54c1a2","source_url":"https://www.anthropic.com/news/claude-opus-5","title":"Claude Opus 5","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-07-24T00:00:00.000Z","first_seen_at":"2026-07-24T20:01:42.259449+00:00","date_source":"page.visible_date"},{"id":"fe39b872-b06a-431f-a22f-0be3d99237af","url":"https://onlylabs.fyi/signals/fe39b872-b06a-431f-a22f-0be3d99237af","source_url":"https://www.anthropic.com/news/economic-futures-research-fund-agenda","title":"Economic Futures Research Fund Agenda","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-07-22T00:00:00.000Z","first_seen_at":"2026-07-22T20:01:45.784193+00:00","date_source":"page.visible_date"},{"id":"bac98d20-6785-463f-bf52-95d40ecaae07","url":"https://onlylabs.fyi/signals/bac98d20-6785-463f-bf52-95d40ecaae07","source_url":"https://www.anthropic.com/news/claude-for-creative-work-dev","title":"Claude For Creative Work Dev","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-04-28T00:00:00.000Z","first_seen_at":"2026-07-23T20:00:55.393567+00:00","date_source":"page.visible_date"},{"id":"cbb53657-aed0-497d-97df-6058d564e6ea","url":"https://onlylabs.fyi/signals/cbb53657-aed0-497d-97df-6058d564e6ea","source_url":"https://www.anthropic.com/news/claude-opus-4-7","title":"Claude Opus 4 7","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-04-16T00:00:00.000Z","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"page.visible_date"},{"id":"8cbc5367-b086-4b80-9ff2-8a8d0c209fa2","url":"https://onlylabs.fyi/signals/8cbc5367-b086-4b80-9ff2-8a8d0c209fa2","source_url":"https://www.anthropic.com/news/claude-opus-4-5","title":"Claude Opus 4 5","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2025-11-24T00:00:00.000Z","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"page.visible_date"}]}