Active12 developments · 10 sources · over 10 daysOpenAI's GPT-5.5 Testing Shows Promising ResultsHow it developedApril 21, 2026Wes RothWhere it startedOpenAI's GPT-5.5 Testing Shows Promising ResultsApril 23, 2026Matthew BermanOpenAI announces GPT-5.5 availabilityApril 24, 2026The Rundown AIOpenAI launches GPT-5.5 'Spud', surpasses ClaudeGPT-5.5 is codenamed Spud and surpasses Claude in performance.April 24, 2026Matt WolfeOpenAI Announces GPT-5.5 ReleaseApril 24, 2026The AI Daily BriefLaunch of GPT 5.5 AnnouncedApril 24, 2026AI ExplainedOpenAI Launches GPT-5.5April 24, 2026Lev SelectorGPT-5.5 Released with Mixed ReviewsApril 24, 2026Matt WolfeGPT-5.5 Released for ChatGPT UsersApril 25, 2026Matt WolfeGPT-5.5 Released with Major User-Friendly UpdatesApril 29, 2026AI NewsOpenAI Launches GPT-5.5 as Advanced AI ModelApril 30, 2026The Verge AIOpenAI to Launch GPT-5.5-Cyber for Select UsersOpenAI launches GPT-5.5-Cyber for select users to enhance institutional defenses.April 30, 2026TechCrunch AIOpenAI limits access to GPT-5.5 Cyber tool