{"schema_version":"onlylabs.public_signal.v1","title":"OpenAI Writing: Addendum to GPT-5 system card: GPT-5-Codex","description":"OpenAI writing signal with public source context, captured evidence pages, related signals, and data-business radar classification.","url":"https://onlylabs.fyi/signals/a406b3f0-f307-4c4f-a920-acc1cc207b66","json_url":"https://onlylabs.fyi/signals/a406b3f0-f307-4c4f-a920-acc1cc207b66/signal.json","generated_at":"2026-06-08T15:45:36.199+00:00","org":{"slug":"openai","name":"OpenAI","category":"frontier-lab","category_label":"Frontier lab","dossier_url":"https://onlylabs.fyi/labs/openai","dossier_json_url":"https://onlylabs.fyi/labs/openai/dossier.json"},"related_urls":{"signal":"https://onlylabs.fyi/signals/a406b3f0-f307-4c4f-a920-acc1cc207b66","signal_json":"https://onlylabs.fyi/signals/a406b3f0-f307-4c4f-a920-acc1cc207b66/signal.json","source":"https://openai.com/index/gpt-5-system-card-addendum-gpt-5-codex","lab_dossier":"https://onlylabs.fyi/labs/openai","lab_dossier_json":"https://onlylabs.fyi/labs/openai/dossier.json","analysis":"https://onlylabs.fyi/analysis/openai","analysis_json":"https://onlylabs.fyi/analysis/openai/analysis.json","analysis_evidence_json":"https://onlylabs.fyi/analysis/openai/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":"OpenAI published Addendum to GPT-5 system card: GPT-5-Codex. This talking signal gives public context for research themes, product direction, policy, or launch framing. High-signal details: Flagship model update with strong HN traction · Addendum to GPT-5 system card: GPT-5-Codex | OpenAI September 15, 2025 Addendum to GPT‑5 system card: GPT‑5‑Codex Read the System Card Share GPT‑5‑Codex is a version of.... onlylabs links this event to 1 captured evidence page and 6 related writing signals.","signal_desk":"talking","source_context":{"source_url":"https://openai.com/index/gpt-5-system-card-addendum-gpt-5-codex","source_host":"openai.com","occurred_at":"2025-09-15T00:00:00+00:00","first_seen_at":"2026-06-05T05:42:57.832854+00:00","date_source":"rss.item_date","context":null},"context_markers":[{"label":"Lab","value":"OpenAI","source":"signal"},{"label":"Signal desk","value":"talking","source":"signal"},{"label":"Source host","value":"openai.com","source":"source"},{"label":"Notability","value":"Flagship model update with strong HN traction","source":"signal"},{"label":"Watch term","value":"RL environments","source":"evidence"},{"label":"Watch 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