ChatGPT

ReleaseOpenAI releases GPT-6 Astra

On 3 September 2026 OpenAI began rolling out GPT-6 Astra, first to its Daybreak cybersecurity program and then to ChatGPT paid plans, the API and AWS, after pausing some research following the July breach.

ReleaseOpenAI releases GPT-5.6 and ChatGPT Work

On 9 July 2026 OpenAI released GPT-5.6, a three-model family named Sol, Terra and Luna, together with ChatGPT Work for enterprise teams, and merged its Codex app into the ChatGPT desktop app.

ReleaseOpenAI launches GPT-Live full-duplex voice in ChatGPT

On 8 July 2026 OpenAI launched GPT-Live, a generation of full-duplex voice models for ChatGPT that can listen and speak at the same time; the smaller model became ChatGPT's default voice model.

ReleaseOpenAI releases GPT-5.5

OpenAI released GPT-5.5 Thinking and GPT-5.5 Pro to paid ChatGPT users on 23 April 2026, then extended the models to Codex and the API, reporting strong benchmark results and later making a faster GPT-5.5 Instant the default.

ReleaseOpenAI releases GPT Image 2

On 21 April 2026 OpenAI released gpt-image-2, an image model that generates and edits pictures from text and image inputs and appears in ChatGPT as ChatGPT Images 2.0. It replaced the GPT Image 1 line and was later revised as versions 2.5 and 2.6.

ReleaseOpenAI releases GPT-5.4 with built-in computer use

On 5 March 2026 OpenAI released GPT-5.4 in Thinking and Pro versions, its first general-purpose model with native computer use; it scored 75% on OSWorld-Verified, above the 72.4% human average.

UpdateOpenAI starts testing ads in ChatGPT

In January 2026 OpenAI began testing ads in ChatGPT for free adult users in the US, later extending them to its Go tier. Ads appeared in March 2026, and by August the ad business was at a $1 billion annualised run rate.

ReleaseOpenAI releases GPT-5.2 after a "code red"

On 11 December 2025 OpenAI released GPT-5.2 in Instant, Thinking and Pro versions, billing it as stronger at professional work and reporting scores that, on OpenAI's GDPval evaluation, matched or beat human experts.

ReleaseOpenAI releases GPT-5.1 with personality presets

On 12 November 2025 OpenAI released GPT-5.1 Instant and GPT-5.1 Thinking in ChatGPT, giving the chatbot a warmer default tone and eight selectable personality presets.

ReleaseOpenAI launches the ChatGPT Atlas browser

On 21 October 2025 OpenAI released ChatGPT Atlas, a macOS browser built around ChatGPT, with agent mode and browser memories. It arrived as a challenge to Google Chrome and was shut down on 9 August 2026.

ReleaseOpenAI DevDay 2025: AgentKit, Apps SDK and Codex general availability

OpenAI held DevDay 2025 in San Francisco on 6 October 2025. It announced AgentKit, the Apps SDK and general availability for Codex, and disclosed usage figures for ChatGPT and its API.

ReleaseOpenAI launches GPT-5

On 7 August 2025 OpenAI introduced GPT-5, a unified system that routes each request between a fast model and a deeper reasoning model. It rolled out the same day to ChatGPT Free, Plus, Pro and Team users.

ReleaseOpenAI launches ChatGPT agent

OpenAI's ChatGPT agent, launched on 17 July 2025, carries out multi-step tasks on its own virtual computer — browsing websites, running code and producing editable files — combining Operator's web interaction with deep research's ability to gather and summarise information.

ReleaseOpenAI launches the Codex software-engineering agent

OpenAI's Codex, launched in May 2025 as a research preview, put a software-engineering agent inside ChatGPT: powered by codex-1 and trained with reinforcement learning, it ran each coding task in its own cloud sandbox.

ReleaseOpenAI releases o3 and o4-mini

On 16 April 2025 OpenAI released o3 and o4-mini, billed as its smartest models to date, alongside the open-source Codex CLI; o3 scored 71.7% on SWE-bench Verified and 2727 Elo on Codeforces.

ReleaseChatGPT gets native GPT-4o image generation

On 25 March 2025 OpenAI added native image generation to GPT-4o in ChatGPT, replacing DALL·E 3 as the default option; the same model reached developers a month later as gpt-image-1.

ReleaseOpenAI releases GPT-4.5

OpenAI released GPT-4.5, code-named Orion, on 27 February 2025 as an expensive research preview that was later shut down.[^1][^2]

ReleaseOpenAI launches deep research in ChatGPT

On 2 February 2025 OpenAI launched deep research in ChatGPT, an agent built on a version of the o3 reasoning model that produced research reports in roughly 3 to 30 minutes and was offered to Pro users first.

ReleaseOpenAI releases o3-mini, including for free ChatGPT users

On 31 January 2025 OpenAI released o3-mini, the first reasoning model it made available to free ChatGPT users, alongside an API release priced per million tokens.

ReleaseOpenAI launches ChatGPT Pro at $200 a month

On 5 December 2024, OpenAI launched ChatGPT Pro, a $200-a-month plan with unlimited access to o1, o1-mini, GPT-4o, Advanced Voice and o1 pro mode; full o1 also arrived in ChatGPT the same day.

UpdateOpenAI launches ChatGPT search

On 31 October 2024 OpenAI launched ChatGPT search for Plus and Team users, evolving from the SearchGPT prototype. It drew on third-party search providers and content from many news publishers, and it became free without an account in February 2025.

UpdateChatGPT Advanced Voice Mode rolls out to paid users

In September 2024, ChatGPT Plus and Team subscribers got Advanced Voice Mode, a real-time spoken conversation feature built on GPT-4o. Its rollout, the removal of one of its launch voices, and its later replacement trace how voice became a default part of ChatGPT.

ReleaseOpenAI releases GPT-4o mini

On 18 July 2024 OpenAI released GPT-4o mini, a smaller, cheaper version of GPT-4o that replaced GPT-3.5 Turbo in ChatGPT and cost $0.15 per million input tokens.

ReleaseOpenAI introduces GPT-4o

On 13 May 2024 OpenAI announced GPT-4o ("GPT-4 Omni"), its new flagship model, which it said can reason across audio, vision and text in real time. Developers could use it through the API the same day.

MilestoneAir Canada held liable for its chatbot's wrong bereavement-fare advice

In 2024 a Canadian tribunal held Air Canada responsible for wrong bereavement-fare advice given by the chatbot on its website, rejecting the airline's claim that the chatbot was a separate legal entity.

UpdateChatGPT starts remembering users across conversations

In 2024 OpenAI gave ChatGPT a memory, letting it carry information about a user from one conversation to the next, with switches to turn the feature off and a temporary chat mode that leaves no memory.

ReleaseOpenAI opens the GPT Store

On 10 January 2024 OpenAI opened the GPT Store, a marketplace for custom versions of ChatGPT. More than three million GPTs had already been built by the time it launched, after the opening slipped from its originally planned date.

ReleaseOpenAI DevDay 2023: GPT-4 Turbo and custom GPTs

On 6 November 2023 OpenAI held its first developer conference, DevDay, announcing GPT-4 Turbo with a 128K context window, custom GPTs built with a GPT Builder, and lower prices across its platform.

UpdateChatGPT can now see, hear and speak

On 25 September 2023 OpenAI announced that ChatGPT could see, hear and speak, adding image input powered by GPT-4V and voice conversations; two days later it also gained web access to current information.

ReleaseOpenAI announces DALL·E 3, built into ChatGPT

On 20 September 2023 OpenAI announced DALL·E 3, its third-generation image model, which was then built directly into ChatGPT; it was designed to refuse requests that imitate the style of living artists.

MilestoneLawyers sanctioned for ChatGPT-fabricated citations in Mata v. Avianca

In 2023 a New York law firm and two of its lawyers were fined US$5,000 after a brief cited judicial decisions that ChatGPT had invented, a case that made courts set rules on generative AI in filings.

IncidentSamsung engineers leak confidential code via ChatGPT

In April 2023 Samsung found that engineers had uploaded sensitive semiconductor code and meeting notes to ChatGPT, then banned generative AI tools on company devices and began building its own.

MilestoneGoldman Sachs report: generative AI could expose 300 million full-time jobs

A Goldman Sachs research note published in March 2023 estimated that generative AI could expose the equivalent of 300 million full-time jobs to automation and add 7% to global GDP over a decade.

UpdateOpenAI announces ChatGPT plugins

On 23 March 2023 OpenAI announced ChatGPT plugins, which connected the chatbot to third-party services and the web, letting it fetch current information, run computations and use outside tools.

ReleaseOpenAI introduces GPT-4

On 14 March 2023 OpenAI announced GPT-4, a multimodal model that accepts image and text input and produces text output. OpenAI reported human-level results on several professional and academic benchmarks but disclosed little about the model's design.

ReleaseOpenAI launches the ChatGPT and Whisper APIs

On 1 March 2023 OpenAI released gpt-3.5-turbo, the model behind ChatGPT, as an API priced at $0.002 per 1,000 tokens, and opened a Whisper speech API the same day.

ReleaseOpenAI launches the ChatGPT Plus subscription

On 1 February 2023 OpenAI launched ChatGPT Plus, a $20-a-month pilot subscription offering access at peak times, faster responses and priority access to new features, while free access was kept.

FundingMicrosoft announces a multibillion-dollar extension of its OpenAI partnership

On 23 January 2023 Microsoft announced a multiyear, multibillion-dollar extension of its OpenAI partnership, making Azure OpenAI's exclusive cloud for all OpenAI workloads.

ReleaseOpenAI introduces the ChatGPT research preview

On 30 November 2022 OpenAI introduced ChatGPT, a conversational model trained with human feedback, and made it free during a research preview. It later became one of the most widely used AI chat products.

ReleaseOpenAI releases text-davinci-003 in the GPT-3.5 series

On 28 November 2022 OpenAI released text-davinci-003 in its GPT-3.5 series; two days later came ChatGPT, fine-tuned from a model in the same series and free during its research preview[^1][^2][^4].