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OpenAI & ChatGPT Timeline: From GPT-1 to GPT-5.5 (2026 Update) - ScriptByAI
This is a timeline of OpenAI’s ChatGPT, the fastest-growing consumer software application in history.From its humble beginnings to becoming a revolutionary force in tech, we’ll trace its journey and milestones.Last updated: May 05, 2026GPT Model Release DatesModel NameRelease DateKey HighlightGPT-5.5 InstantMay 06, 2026A big upgrade, giving you smarter, clearer, and more personalized answers in a warmer, more natural tone.GPT-5.5 / GPT-5.5 ProApril 23, 2026Smartest and most intuitive GPT model in the timeline, built for a more capable computer-based work experience.ChatGPT Images 2.0April 21, 2026Advanced image model for complex visual tasks, sharper editing, richer layouts, and precise usable outputs.GPT-RosalindApril 16, 2026Frontier reasoning model for biology, drug discovery, and translational medicine research.GPT-5.4-CyberApril 15, 2026GPT-5.4 variant fine-tuned for cybersecurity and defensive workflows.GPT-5.4 MiniMarch 17, 2026Faster GPT-5.4 model optimized for coding, computer use, multimodal understanding, and subagents.GPT-5.4 NanoMarch 17, 2026Smallest and cheapest GPT-5.4 model for lightweight tasks.GPT-5.4 ThinkingMarch 5, 2026Frontier reasoning model for reasoning, coding, and agentic workflows.GPT-5.4 / GPT-5.4 ProMarch 5, 2026Pro-tier GPT-5.4 model for advanced ChatGPT use.GPT-5.3 InstantMarch 3, 2026Everyday conversation model focused on smoother and more useful responses.GPT-5.3-Codex-SparkFebruary 12, 2026Ultra-fast model for real-time coding in Codex.GPT-5.3-CodexFebruary 6, 2026Agentic coding model for advanced software engineering workflows.GPT-5.2-CodexDecember 18, 2025Advanced agentic coding model for complex real-world software engineering.GPT Image 1.5December 16, 2025Flagship image generation model powering a new version of ChatGPT Images.GPT-5.2December 11, 2025Model series with stronger reasoning, coding, long-context understanding, vision, and reduced hallucinations.GPT-5.1 ProNovember 19, 2025Pro-tier GPT-5.1 model for advanced users.GPT-5.1 InstantNovember 13, 2025Faster GPT-5.1 model for everyday ChatGPT use.GPT-5.1 ThinkingNovember 13, 2025GPT-5.1 reasoning model for deeper thinking tasks.GPT-5 ProOctober 7, 2025High-precision GPT-5 model for demanding API workloads.Sora 2September 30, 2025Video generation model with stronger physical accuracy, realism, and control.GPT-5August 7, 2025Flagship GPT model described as smarter, faster, and more useful, with built-in thinking.gpt-oss-120bAugust 6, 2025Open-weight reasoning mod...
ChatGPT 5.5 Codex Brings Full-Stack Coding, Testing, Design, and Launch ...
ChatGPT 5.5 Codex / Img: youtube.com What is drawing attention is not just that ChatGPT 5.5 Codex can write code, but that it brings much of the full-stack workflow into one place. For developers working under tighter deadlines, that kind of consolidation can reduce the constant switching between tools and make the path from build to test more direct. The appeal grows as modern development demands speed and consistency. In a single environment, teams can move from coding to testing and fixing with a smoother flow, which is part of why the platform is attracting interest across different kinds of projects. A broader workspace for full-stack tasks Alex Finn says ChatGPT 5.5 Codex is designed to support full-stack development more smoothly. The idea is to connect multiple layers of an application so developers do not need to split work across too many separate platforms. That approach matters because the platform is not limited to code generation. Debugging, documentation, and testing are also part of the workflow, with automation and multitasking helping to keep the process more structured. Integration that reduces friction One of the strongest examples is its support for services such as Convex. That integration makes database management easier and is seen as efficient, especially because Convex offers an intuitive interface and a generous free tier. Real-time API integration adds another layer of usefulness. With APIs such as Alpha Vantage, developers can build dynamic applications more easily, including stock trackers that update live data as it changes. Design and development in the same environment ChatGPT 5.5 Codex also stands out because it does not stop at code. UI and UX design tools are built into the same workspace, allowing visual and technical work to move forward together. The integrated Image Gen 2 model makes it possible to create design elements directly inside the platform. That reduces reliance on external tools and helps teams iterate faster from the earliest stages of development. There is also real-time annotation and direct editing through a built-in browser. Together, those features let developers review, adjust, and refine interfaces without leaving the main workflow. Automation and parallel work A major advantage of the platform is support for multiple AI agents running at the same time. One agent can focus on coding and debugging while another handles research or marketing materials. That parallel structure allows work that would...
OpenAI schedules private GPT-5.5 event in San Francisco
Synopsis OpenAI is hosting an exclusive, invite-only event in San Francisco on May 5, coinciding with the launch of GPT-5.5. The "GPT-5.5 on 5/5" gathering aims to bring together developers and OpenAI team members for a "low-key meetup." This event follows the recent rollout of GPT-5.5, described as a "new class of intelligence for real work and powering agents." Listen to this article in ...
Sam Altman Consults GPT-5.5 on Launch Party Plans
Business Insider reports that OpenAI CEO Sam Altman said he asked `GPT-5.5` what it would want for a launch celebration for the model, and that the system returned detailed, unusual suggestions. According to Business Insider, the model proposed holding the event on May 5, keeping speeches short, having the model's human creators deliver a toast (and not the AI itself), and creating a central ...
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