{"schema_version":"onlylabs.public_signal.v1","title":"Anthropic Writing: Prompting Long Context","description":"Anthropic writing signal with public source context, captured evidence pages, related signals, and data-business radar classification.","url":"https://onlylabs.fyi/signals/ba7bccbc-aaac-4b8b-8171-6889527494cb","json_url":"https://onlylabs.fyi/signals/ba7bccbc-aaac-4b8b-8171-6889527494cb/signal.json","generated_at":"2026-06-11T04:15:03.907832+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/ba7bccbc-aaac-4b8b-8171-6889527494cb","signal_json":"https://onlylabs.fyi/signals/ba7bccbc-aaac-4b8b-8171-6889527494cb/signal.json","source":"https://www.anthropic.com/news/prompting-long-context","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 Prompting Long Context. This talking signal gives public context for research themes, product direction, policy, or launch framing. High-signal details: Prompt engineering for Claude's long context window \\ Anthropic Product Prompt engineering for Claude's long context window Sep 23, 2023 Claude’s 100,000 token.... onlylabs links this event to 1 captured evidence page and 6 related writing signals.","signal_desk":"talking","source_context":{"source_url":"https://www.anthropic.com/news/prompting-long-context","source_host":"anthropic.com","occurred_at":"2023-09-23T00:00:00.000Z","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":"Watch term","value":"Eval methodology","source":"evidence"},{"label":"Watch term","value":"Data pipeline","source":"evidence"},{"label":"Watch term","value":"Infrastructure","source":"evidence"},{"label":"Watch term","value":"Safety and 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public writing and discussion into a readable map of research themes, product framing, policy posture, launch narratives, and market attention.","evidence_focus":["post title","source URL","captured page text","HN traction","linked model or paper references","publication date"],"extraction_questions":["Which themes are labs choosing to explain publicly?","Which posts are attracting outside discussion?","Which writing reframes a recent release, model, hiring wave, or policy stance?","Which posts mention data, evals, infrastructure, safety, or deployment workflows?"],"signal_questions":["What public theme, launch framing, or research direction does this writing signal expose?","Which themes are labs choosing to explain publicly?","Which posts are attracting outside discussion?","Do the 6 related writing signals show a repeated pattern?"],"output_fields":["org","theme","public_framing","traction","data_business_lane","evidence_url"],"data_business_relevance":"Public writing supplies the 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/ba7bccbc-aaac-4b8b-8171-6889527494cb/signal.json","required":true},{"label":"source","url":"https://www.anthropic.com/news/prompting-long-context","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 \"Prompting Long Context\" for frontier lab strategy."},"semantic_triples":[{"subject":"Anthropic","predicate":"published","object":"Prompting Long Context","text":"Anthropic published Prompting Long Context."},{"subject":"Prompting Long Context","predicate":"is classified as","object":"writing signal","text":"Prompting Long Context is classified as writing signal."},{"subject":"Prompting Long Context","predicate":"belongs to","object":"talking desk","text":"Prompting Long Context belongs to talking desk."},{"subject":"Prompting Long Context","predicate":"has evidence coverage","object":"1 captured evidence page","text":"Prompting Long Context has evidence coverage 1 captured evidence page."},{"subject":"Prompting Long Context","predicate":"has captured page count","object":"1","text":"Prompting Long Context has captured page count 1."},{"subject":"Prompting Long Context","predicate":"has readable page count","object":"1","text":"Prompting Long 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This talking signal gives public context for research themes, product direction, policy, or launch framing. High-signal details: Prompt engineering for Claude's long context window \\ Anthropic Product Prompt engineering for Claude's long context window Sep 23, 2023 Claude’s 100,000 token.... onlylabs links this event to 1 captured evidence page and 6 related writing signals.","semantic_triples":[{"subject":"Anthropic","predicate":"published","object":"Prompting Long Context","text":"Anthropic published Prompting Long Context."},{"subject":"Prompting Long Context","predicate":"is classified as","object":"writing signal","text":"Prompting Long Context is classified as writing signal."},{"subject":"Prompting Long Context","predicate":"belongs to","object":"talking desk","text":"Prompting Long Context belongs to talking desk."},{"subject":"Prompting Long Context","predicate":"has evidence coverage","object":"1 captured evidence page","text":"Prompting Long Context has evidence coverage 1 captured evidence page."}]},"signal":{"id":"ba7bccbc-aaac-4b8b-8171-6889527494cb","url":"https://onlylabs.fyi/signals/ba7bccbc-aaac-4b8b-8171-6889527494cb","json_url":"https://onlylabs.fyi/signals/ba7bccbc-aaac-4b8b-8171-6889527494cb/signal.json","source_url":"https://www.anthropic.com/news/prompting-long-context","title":"Prompting Long Context","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":"2023-09-23T00:00:00.000Z","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"page.visible_date","evidence_coverage":{"target_pages":1,"captured_pages":1,"readable_pages":1,"capture_methods":["plain"],"missing_page_urls":[],"failed_page_urls":[],"blocked_page_urls":[],"page_urls":["https://www.anthropic.com/news/prompting-long-context"]},"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":{"url":"https://www.anthropic.com/news/prompting-long-context","final_url":"https://www.anthropic.com/news/prompting-long-context","title":"Prompting Long Context","http_status":200,"content_type":"text/html; charset=utf-8","capture_method":"plain","fetched_at":"2026-06-11T04:15:03.907832+00:00","bytes":151177,"raw_path":"34508b0b103bf74b414e2123dcc6b4157d5a698f1f9423b9e9885cc8fcb7d0be.html","content_hash":"b20b8ccce256b898e3ee7fd4141c2a46953992b4371708edcfdb801c81f9f01d","excerpt_chars":1200,"truncated":true,"excerpt":"Prompt engineering for Claude's long context window \\ Anthropic Product Prompt engineering for Claude's long context window Sep 23, 2023 Claude’s 100,000 token long context window enables the model to operate over hundreds of pages of technical documentation, or even an entire book . As we continue to scale the Claude API, we’re seeing increased demand for prompting guidance on how to maximize Claude’s potential. Today, we’re pleased to share a quantitative case study on two techniques that can improve Claude’s recall over long contexts: Extracting reference quotes relevant to the question before answering Supplementing the prompt with examples of correctly answered questions about other sections of the document Let’s get into the details. Testing long context recall: Multiple choice Q&A Our goal with this experiment is to evaluate techniques to maximize Claude’s chance of correctly recalling a specific piece of information from a long document. As the underlying data source for our testing, we used a daily-issue, publicly available government document that contains the meeting transcripts and activities of many different departments. We chose a document from July 13,..."},"evidence_pages":[{"url":"https://www.anthropic.com/news/prompting-long-context","final_url":"https://www.anthropic.com/news/prompting-long-context","title":"Prompting Long Context","http_status":200,"content_type":"text/html; charset=utf-8","capture_method":"plain","fetched_at":"2026-06-11T04:15:03.907832+00:00","bytes":151177,"raw_path":"34508b0b103bf74b414e2123dcc6b4157d5a698f1f9423b9e9885cc8fcb7d0be.html","content_hash":"b20b8ccce256b898e3ee7fd4141c2a46953992b4371708edcfdb801c81f9f01d","excerpt_chars":1200,"truncated":true,"excerpt":"Prompt engineering for Claude's long context window \\ Anthropic Product Prompt engineering for Claude's long context window Sep 23, 2023 Claude’s 100,000 token long context window enables the model to operate over hundreds of pages of technical documentation, or even an entire book . As we continue to scale the Claude API, we’re seeing increased demand for prompting guidance on how to maximize Claude’s potential. Today, we’re pleased to share a quantitative case study on two techniques that can improve Claude’s recall over long contexts: Extracting reference quotes relevant to the question before answering Supplementing the prompt with examples of correctly answered questions about other sections of the document Let’s get into the details. Testing long context recall: Multiple choice Q&A Our goal with this experiment is to evaluate techniques to maximize Claude’s chance of correctly recalling a specific piece of information from a long document. As the underlying data source for our testing, we used a daily-issue, publicly available government document that contains the meeting transcripts and activities of many different departments. We chose a document from July 13,..."}],"related_signals":[{"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":"2026-06-10T15:16:01+00:00","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"sitemap.lastmod"},{"id":"2648db51-9d6a-42a9-aece-a0ca5f9ce64f","url":"https://onlylabs.fyi/signals/2648db51-9d6a-42a9-aece-a0ca5f9ce64f","source_url":"https://www.anthropic.com/news/claude-fable-5-mythos-5","title":"Claude Fable 5 Mythos 5","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-06-09T20:27:50+00:00","first_seen_at":"2026-06-10T07:01:05.666054+00:00","date_source":"sitemap.lastmod"},{"id":"8475487f-45b4-4689-9bc5-8e4c6ca0457d","url":"https://onlylabs.fyi/signals/8475487f-45b4-4689-9bc5-8e4c6ca0457d","source_url":"https://www.anthropic.com/engineering/how-we-contain-claude","title":"How We Contain Claude","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-06-06T00:28:16+00:00","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"sitemap.lastmod"},{"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":"2026-06-05T20:13:40+00:00","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"sitemap.lastmod"},{"id":"cc62deba-9682-4751-aa6b-81c3bd7122a0","url":"https://onlylabs.fyi/signals/cc62deba-9682-4751-aa6b-81c3bd7122a0","source_url":"https://www.anthropic.com/research/measuring-agent-autonomy","title":"Measuring Agent Autonomy","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-06-05T15:49:18+00:00","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"sitemap.lastmod"},{"id":"93da14fd-7141-4e17-abd6-1c8d52435c70","url":"https://onlylabs.fyi/signals/93da14fd-7141-4e17-abd6-1c8d52435c70","source_url":"https://www.anthropic.com/research/values-wild","title":"Values Wild","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"anthropic","name":"Anthropic","category":"frontier-lab"},"occurred_at":"2026-06-05T15:38:54+00:00","first_seen_at":"2026-06-09T02:17:26.339488+00:00","date_source":"sitemap.lastmod"}]}