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This page describes what the document states, permits, or reserves. It does not constitute a legal determination about enforceability. Regulatory applicability may vary by jurisdiction. Methodology
This document describes the safety testing OpenAI performed on GPT-5.5 and GPT-5.5 Pro before making them available, including adversarial testing focused on cybersecurity and biology risks. OpenAI states these models carry its strongest safeguards to date. GPT-5.5 Pro generally relies on GPT-5.5's safety results rather than always being independently tested.
This system card establishes the predeployment safety process OpenAI applied to GPT-5.5 and GPT-5.5 Pro before release, including completion of OpenAI's full predeployment safety evaluation suite and its Preparedness Framework, with targeted red-teaming focused on advanced cybersecurity and biology capabilities. OpenAI deployed the model with what it characterizes as its strongest safeguards to date, designed to reduce misuse while preserving legitimate uses. For GPT-5.5 Pro, OpenAI generally treats GPT-5.5 safety results as strong proxies, conducting separate evaluations only when OpenAI judges that the Pro setting could materially impact relevant risks or the appropriate safeguards posture. Evaluation results described in the card were conducted in an offline setting except where explicitly noted, and the card is a living document that was updated after original publication to add API-specific safeguard information.
For an individual user, this document establishes that GPT-5.5 and GPT-5.5 Pro were released only after passing a defined set of safety evaluations and adversarial red-teaming, particularly in high-risk areas like cybersecurity and biology. The safeguards in place are described as OpenAI's strongest to date, aimed at reducing misuse while keeping beneficial uses accessible. Users interacting with GPT-5.5 Pro should be aware that its safety posture is generally assessed by proxy from GPT-5.5 results, with independent evaluation applied only where OpenAI judges the Pro setting could materially affect risk.
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22 important changes detected
23 versions captured · Last updated: September 2026
OpenAI updated their OpenAI GPT-5.5 System Card on September 23, 2026. Change detected: 1 sentence(s) modified. Document contained 9 sentences after update.
View change record →OpenAI updated their OpenAI GPT-5.5 System Card on September 17, 2026. Change detected: 1 sentence(s) modified. Document contained 9 sentences after update.
View change record →OpenAI's GPT-5.5 System Card title was reformatted in an update detected on September 10, 2026. The document header changed from 'OpenAI April 23, 2026 Safety Publication GPT-5.5 System Card' to …
View change record →OpenAI's GPT-5.5 System Card was updated in an update detected on September 9, 2026. The change modified the metadata and related content references in the document. Specifically, the document removed …
View change record →OpenAI's GPT-5.5 System Card was updated on September 7, 2026, to modify the list of related safety and research content displayed on the card. A reference to 'The Hugging Face …
View change record →OpenAI updated the GPT-5.5 System Card detected on September 5, 2026. The prior version listed a link to 'The Hugging Face incident and the road ahead' dated August 26, 2026 …
View change record →OpenAI's GPT-5.5 System Card was revised in an update detected on September 4, 2026. The updated version removed two linked safety publications from its navigation structure: 'The Hugging Face incident …
View change record →OpenAI's GPT-5.5 System Card was updated in an update detected on September 2, 2026. The updated document removed two older blog post links (one about pacing model development from August …
View change record →OpenAI's GPT-5.5 System Card was updated on August 27, 2026 to revise its introductory metadata and add a reference to a security incident discussion. The change replaced outdated blog post …
View change record →OpenAI's GPT-5.5 System Card was updated in an update detected on August 20, 2026. The change involved removing references to three previously listed company and product announcements (Expanding Daybreak as …
View change record →OpenAI's GPT-5.5 System Card was detected as updated on August 19, 2026. The change modified the featured content links in the document's header section, replacing three dated articles (published August …
View change record →OpenAI's GPT-5.5 System Card, last substantively updated on April 24, 2026, was modified on August 11, 2026. The change replaced a reference to a July 28, 2026 publication ('Scientific computing …
View change record →OpenAI's GPT-5.5 System Card was updated in an update detected on August 2, 2026. The change replaced one research publication link in the card's header with a different publication. Specifically, …
View change record →OpenAI updated the GPT-5.5 System Card detected on July 30, 2026. The change replaced three featured research and safety articles in the document's header with two different research publications. The …
View change record →OpenAI's GPT-5.5 System Card was updated in an update detected on July 21, 2026. The document removed a reference to an article titled 'GPT-Red: Unlocking Self-Improvement for Robustness' published July …
View change record →OpenAI updated the GPT-5.5 System Card on April 24, 2026, to include safeguards information. In an update detected on July 18, 2026, a single sentence was modified in the card's …
View change record →OpenAI's GPT-5.5 System Card was updated in an update detected on July 16, 2026. The change involved reorganizing the document header and updating the related publications section. Specifically, a new …
View change record →The OpenAI GPT-5.5 System Card had its title formatting modified in an update detected on July 15, 2026. The document previously opened with 'GPT-5.5 System Card | OpenAI April 23, …
View change record →OpenAI's GPT-5.5 System Card was updated on July 11, 2026 to modify the list of related research and product announcements displayed at the bottom of the card. The previous version …
View change record →OpenAI updated the GPT-5.5 System Card on July 9, 2026 by modifying the related research links displayed alongside the card. The updated version replaced two previously listed research articles with …
View change record →Every distinct legal provision identified in this document. Featured provisions appear above with analysis.
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