Introduction

ChatGPT, OpenAI's text-generating AI chatbot, has taken the world by storm since its launch in November 2022. What started as a tool to supercharge productivity through writing essays and code with short text prompts has evolved into a behemoth with 300 million weekly active users by early 2025. In 2025, OpenAI battled the perception that it was ceding ground in the AI race to Chinese rivals like DeepSeek, while trying to shore up its relationship with Washington, pursue ambitious data center projects, and lay the groundwork for one of the largest funding rounds in history. This timeline details the key updates and milestones for ChatGPT throughout the year.

January 2025: New Models and Government Plans

Launch of o3-mini Reasoning Model

OpenAI launched o3-mini, its latest "reasoning" model, on January 31. The model was first previewed in December alongside a more capable system called o3. OpenAI pitched it as both powerful and affordable, designed for tasks requiring step-by-step reasoning. The company also changed how the model communicates its thought process, showing more of its reasoning steps to users.

ChatGPT Gov for U.S. Agencies

OpenAI introduced ChatGPT Gov, a plan tailored for U.S. government agencies that includes many features of ChatGPT Enterprise. This allowed agencies to manage their own security and compliance while using the AI tools for non-public sensitive data. Additionally, OpenAI began testing signups using only a phone number, initially in the U.S. and India.

New Features: Tasks and Customization

In January, ChatGPT added a beta feature called "tasks" that lets users set reminders and recurring actions. Users could also assign traits to the chatbot, such as "Chatty" or "Gen Z," to personalize interactions. Meanwhile, a report from Appfigures revealed that 85% of ChatGPT's mobile users are male, and over half are under 25.

February 2025: Deep Research and Web Search

Deep Research Agent

OpenAI unveiled a new AI agent called deep research, designed to help users conduct in-depth, complex research by analyzing multiple sources. The agent was intended for users who need more than a quick answer and want to consider information from various websites.

Web Search Without Login

OpenAI allowed anyone to use ChatGPT web search without logging in, though the mobile app still required sign-in. The company also canceled the standalone release of the o3 model, choosing instead to integrate its technology into a unified GPT-5 release.

Energy Consumption Clarification

A commonly cited stat that ChatGPT requires 3 watt-hours per query was debunked by Epoch AI, which found the average query consumes around 0.3 watt-hours using GPT-4o, though this does not account for features like image generation.

March 2025: Image Generation and Creative Writing

Upgraded Image Generation with GPT-4o

OpenAI rolled out a major upgrade to ChatGPT's image generation capabilities, allowing users to generate and edit images directly using the GPT-4o model. The feature went viral for creating Studio Ghibli-style images, raising copyright concerns. More than 700 million images were generated by over 130 million users within weeks. The company also removed restrictions on generating images of public figures and hateful symbols, citing an evolved approach.

Creative Writing Model

CEO Sam Altman announced that OpenAI had trained a new model that is "really good" at creative writing, posting a sample short story about AI and grief. The company also adopted Anthropic's Model Context Protocol (MCP) to link AI models with data sources.

Voice Mode and Video Generation

OpenAI updated its AI voice assistant with more natural conversations and real-time capabilities, rolling it out to free users. The company also explored integrating voice mode directly into the main chat interface. Additionally, OpenAI released GPT Image 1.5, a faster and more precise image generation model.

April 2025: New Reasoning Models and Safety Concerns

Launch of o3 and o4-mini Reasoning Models

OpenAI released two new reasoning models: o3 and o4-mini. o3 was described as the most advanced reasoning model, while o4-mini balanced price and speed. Both models could use ChatGPT features like web browsing, coding, and image processing, but they hallucinated more than previous models.

GPT-4.1 for Coding

OpenAI introduced GPT-4.1, a model focused on coding capabilities, available via the API but not ChatGPT. It rivaled models from Google, Anthropic, and DeepSeek. The company also discontinued GPT-4 in ChatGPT, replacing it with GPT-4o.

Safety and Content Moderation

OpenAI worked to fix a bug that allowed minors to engage in inappropriate conversations with the chatbot. The company also faced a privacy complaint in Europe for false accusations generated by ChatGPT, and a study from MIT suggested that ChatGPT use might harm critical thinking skills.

May 2025: Agents and Shopping Features

Codex AI Coding Agent

OpenAI introduced Codex, an AI coding agent powered by a specialized model that could take from one to 30 minutes to complete coding tasks. The company also improved ChatGPT's shopping features, providing recommendations, images, and reviews for products.

Data Residency and Infrastructure

OpenAI launched a data residency program in Asia and announced a program called OpenAI for Countries to develop local AI infrastructure. The company also pledged to fix issues with ChatGPT being overly sycophantic, rolling back an update that made the chatbot too agreeable.

June 2025: Voice Mode and Energy Consumption

Upgraded Advanced Voice Mode

OpenAI upgraded ChatGPT's conversational voice mode for all paid users, making interactions more natural and fluid. The company also released o3-pro, an enhanced version of its reasoning model.

Business Features

ChatGPT added new features for business users, including meeting recording, connectors for Google Drive and Box, and MCP support. The mention of energy consumption per query was clarified by Sam Altman, who said the average query uses about 0.34 watt-hours of electricity, enough to power a lightbulb for a few minutes.

July 2025: Study Mode and General Agent

Study Mode

OpenAI unveiled Study Mode, a feature designed to promote critical thinking by prompting students to engage with material rather than simply receiving answers. The tool rolled out to Free, Plus, Pro, and Team users.

ChatGPT Agent

OpenAI introduced ChatGPT Agent, a general-purpose agent that could complete computer-based tasks such as navigating calendars, drafting presentations, and shopping online. The company also delayed the release of its open-weight model for additional safety testing.

User Growth and Legal Issues

ChatGPT reached 2.5 billion prompts daily and nearly 700 million weekly active users. Seven more families sued OpenAI, alleging that GPT-4o contributed to suicides due to insufficient safeguards. The company also faced a trademark lawsuit from Cameo over the use of the term "cameo" for Sora features.

August 2025: GPT-5 Launch and Open Source

GPT-5 Unveiled

OpenAI released GPT-5, a next-generation AI model that could handle tasks like coding apps, managing calendars, and creating research briefs. The model offered three modes: Auto, Fast, and Thinking. The launch came amid a "code red" at OpenAI as CEO Sam Altman pushed to prioritize ChatGPT improvements over other initiatives.

Open Source Models

OpenAI returned to open source with two new open-weight models: gpt-oss-120b for high-performance computing and gpt-oss-20b for laptops. The company also offered ChatGPT Enterprise to federal agencies for $1 for the first year.

Lawsuits and Revenue

OpenAI strengthened ChatGPT safeguards after a teen suicide lawsuit, and xAI sued Apple and OpenAI over alleged collusion. ChatGPT's mobile app surpassed $2 billion in consumer spending, averaging nearly $193 million per month.

September 2025: Shopping and Parental Controls

AI Shopping with Instant Checkout

OpenAI launched Instant Checkout in ChatGPT, allowing U.S. users to purchase products from Etsy and soon from over a million Shopify merchants directly within the chat. The feature integrated Apple Pay, Google Pay, and other payment methods.

Parental Controls and Pulse

OpenAI introduced parental controls for ChatGPT on web and mobile, allowing parents to link accounts and limit sensitive content. The company also unveiled Pulse, a personalized morning briefing feature that made ChatGPT more proactive.

Developer Apps and Growth

Developers could now build interactive apps inside ChatGPT, with partners like Booking.com, Expedia, and Spotify. ChatGPT surpassed 800 million weekly active users by the end of October.

October 2025: Atlas Browser and Enterprise Surge

ChatGPT Atlas Browser

OpenAI launched ChatGPT Atlas, an AI browser that lets users get answers from ChatGPT instead of traditional search results. The browser initially launched on Mac, with plans for Windows, iOS, and Android.

Music Generation and Suicide Conversations

OpenAI reportedly worked on a tool that generates music from text and audio prompts, trained using annotated scores from Juilliard students. The company also revealed that ChatGPT handles over a million suicide-related conversations weekly, prompting improved mental health safeguards.

Business Growth

OpenAI reached 1 million business clients globally, making it the fastest-growing business platform in history. Companies like Amgen, Booking.com, and Morgan Stanley used ChatGPT and developer tools to enhance operations. A Munich court ruled that ChatGPT violated German copyright law by reproducing lyrics from protected songs.

November 2025: Group Chat and Codex Updates

Group Chats for All

OpenAI rolled out group chats to all ChatGPT users after testing, allowing friends, family, and coworkers to interact with ChatGPT together. The company also released GPT-5.1 with improved reasoning and tone customization.

Codex for Coding

OpenAI released GPT-5-Codex, a version of its AI coding agent that could handle tasks from seconds to hours, outperforming GPT-5 on coding benchmarks. The company also faced a lawsuit from seven families over alleged suicides linked to GPT-4o.

December 2025: GPT-5.2 and Disney Partnership

GPT-5.2 and Image Generation

OpenAI launched GPT-5.2 with three versions (Instant, Thinking, Pro) tailored for different tasks. The company also released GPT Image 1.5 for faster, more precise image generation. ChatGPT surpassed $3 billion in mobile app revenue since its 2023 launch.

Disney Partnership

Disney invested $1 billion in OpenAI and partnered to bring characters from Disney, Marvel, Pixar, and Star Wars to OpenAI's Sora video generator. The deal included a one-year exclusive period before expanding AI licensing.

Energy and Tone Controls

OpenAI added new controls in ChatGPT that let users adjust the chatbot's warmth, enthusiasm, and formatting style. The company also updated guidelines for teen users to promote safer interactions.

Source: TechCrunch News