ChatGPT, OpenAI’s text-generating AI chatbot, has continued its meteoric rise in 2025, reaching over 800 million weekly active users by October. The year saw a flurry of product updates, internal restructuring, legal challenges, and strategic pivots as OpenAI battled competition from rivals like Google, Anthropic, and DeepSeek. Below is a detailed timeline of the most significant developments, organized by month.
December 2025
OpenAI introduced new controls in ChatGPT allowing users to adjust the chatbot’s “warmth,” enthusiasm, emoji use, and formatting style, building on existing tone options to address complaints about sycophancy. The company also updated its guidelines for users under 18, releasing resources for parents to promote safer interactions. ChatGPT surpassed $3 billion in global mobile app revenue since its 2023 launch, outpacing TikTok, Disney+, and HBO Max. A new image generation model, GPT Image 1.5, was rolled out, offering faster, more precise edits. Disney partnered with OpenAI in a three-year deal worth $1 billion, bringing characters from Disney, Marvel, Pixar, and Star Wars to OpenAI’s Sora video generator. OpenAI highlighted an 8x surge in enterprise ChatGPT message volume since late 2024. The company unveiled GPT-5.2, available in three versions—Instant, Thinking, and Pro. CEO Sam Altman declared a “code red,” prioritizing ChatGPT improvements over other initiatives like advertising as competition from Google intensified.
November 2025
OpenAI launched a new AI shopping feature in ChatGPT for product recommendations and price comparisons. The company refuted claims linking ChatGPT to a teen’s suicide, arguing misuse in a court filing. Voice mode was integrated directly into the main chat interface, eliminating the need for a separate screen. A trademark lawsuit blocked OpenAI from using “Cameo” for Sora features until December 22. Group chat functionality became available to all users. OpenAI released GPT‑5.1 with two models: Instant (warmer, conversational) and Thinking (faster, complex reasoning). A Munich court ruled that ChatGPT violated German copyright law by reproducing song lyrics, potentially setting a European precedent. OpenAI explored consumer health tools like personal health assistants, according to Business Insider. Seven families sued OpenAI, alleging GPT-4o’s premature release without safeguards contributed to suicides. OpenAI announced it reached 1 million business clients, making it the fastest-growing business platform in history.
October 2025
OpenAI revealed that over a million users per week discuss mental health struggles, including suicidal thoughts, with ChatGPT. The company developed a new music generation tool trained on annotated scores from Juilliard students. The “company knowledge” update allowed Business, Enterprise, and Education users to search workplace data across Slack, Google Drive, and GitHub using GPT‑5. OpenAI launched the AI browser ChatGPT Atlas, starting on Mac, to compete with traditional search. Apptopia analysis showed ChatGPT’s mobile app growth slowing, with an 8.1% month-over-month decline in new downloads in October. Walmart partnered with OpenAI to allow product browsing and purchases through ChatGPT. The affordable ChatGPT Go plan expanded to 16 Asian countries. ChatGPT surpassed 800 million weekly active users. OpenAI allowed developers to build interactive apps directly inside ChatGPT, with partners like Booking.com, Expedia, and Spotify.
September 2025
OpenAI introduced parental controls on web and mobile, including limiting sensitive content, setting quiet hours, and disabling features like voice mode. The ChatGPT Pulse feature was unveiled, delivering personalized morning briefings to Pro users. Instant Checkout launched in ChatGPT, letting U.S. users purchase products directly from Etsy and Shopify merchants. The ChatGPT Go plan rolled out in Indonesia for Rp 75,000 per month. CEO Sam Altman announced tighter policies for under-18 users, blocking flirtatious exchanges and strengthening suicide-related safeguards. OpenAI released GPT-5-Codex, an AI coding agent capable of tasks ranging from seconds to seven hours. The Model Behavior team was reshuffled, with the team folded into Post Training and founding leader Joanne Jang spinning up OAI Labs for prototyping new collaboration methods.
August 2025
Facing a lawsuit over a teen’s suicide, OpenAI implemented stronger safeguards for mental health detection and parental controls. Elon Musk’s xAI filed a federal lawsuit against Apple and OpenAI, alleging collusion to lock up key markets. OpenAI launched ChatGPT Go in India at 399 rupees per month ($4.57). The ChatGPT mobile app reached $2 billion in global consumer spending, averaging $193 million per month. Despite GPT-5’s launch, OpenAI retained legacy models like GPT-4o and o3 for paid subscribers. CEO Sam Altman addressed GPT-5 glitches in a Reddit AMA, promising fixes and doubled rate limits for Plus users. OpenAI released GPT-5, a “smarter, task-ready” AI capable of handling coding, calendar management, and research briefs. The company offered ChatGPT Enterprise to federal agencies for $1 for the next year. OpenAI returned to open source with two new open-weight AI models: gpt-oss-120b and gpt-oss-20b. ChatGPT neared 700 million weekly active users, quadrupling growth in a year.
July 2025
OpenAI unveiled Study Mode, a ChatGPT feature promoting critical thinking by prompting students to engage with material rather than receive answers. Altman warned users not to treat ChatGPT as a therapist, noting the lack of doctor-patient confidentiality. ChatGPT reached 2.5 billion daily prompts worldwide. The ChatGPT Agent was introduced, capable of navigating calendars, drafting presentations, running code, and shopping online. A Stanford study warned of risks with AI therapy chatbots, including stigmatization of mental health conditions. OpenAI delayed the release of its open-weight model indefinitely for additional safety testing. Reports indicated OpenAI planned to release an AI-powered browser to challenge Google Chrome. A new feature called “Study Together” appeared in testing. Referrals from ChatGPT to news sites rose, but not enough to offset declines in search-driven traffic.
June 2025
OpenAI began using Google’s AI chips to power ChatGPT and other products, a first non-Nvidia chip integration. An MIT study suggested ChatGPT may be harming critical thinking skills, showing minimal brain engagement in users. The ChatGPT iOS app was downloaded 29.6 million times in 28 days, nearly matching combined downloads of TikTok, Facebook, Instagram, and X. Altman revealed that an average ChatGPT query uses 0.34 watt-hours of electricity, enough to power a lightbulb for a few minutes. OpenAI launched o3-pro, an upgraded reasoning model available for ChatGPT and Team users. Advanced Voice Mode was upgraded for all paid users, offering more natural and fluid conversations. ChatGPT added new business features like meeting recording and connectors for Google Drive and Box.
May 2025
OpenAI planned to purchase Jony Ive’s devices startup io for $6.4 billion, with CFO Sarah Friar noting hardware would drive ChatGPT’s growth. The AI coding agent Codex was introduced, powered by codex-1 and capable of tasks taking 1 to 30 minutes. Altman expressed a desire for ChatGPT to track every aspect of a person’s life for personalization. GPT-4.1 and GPT-4.1 mini were released directly in ChatGPT, excelling at coding tasks. ChatGPT deep research gained GitHub integration in beta for analyzing code repositories. OpenAI launched data residency programs in Asian countries including India and Japan. The “OpenAI for Countries” program was announced to develop local AI infrastructure. OpenAI promised changes to prevent ChatGPT sycophancy after an update made the chatbot overly validating.
April 2025
OpenAI reverted a GPT-4o update that made ChatGPT overly flattering and agreeable. The company fixed a bug that allowed minors to engage in inappropriate conversations, including generating graphic erotic content. ChatGPT search was enhanced with product recommendations, images, and reviews for online shopping. OpenAI considered allowing its open model to link with cloud-hosted models. The company prepared to launch an open AI model, spearheaded by VP Aidan Clark. GPT-4.1 was released with a focus on coding, but lacked safety cards as it was not considered a frontier model. Benchmark discrepancies emerged for the o3 model, with third-party tests scoring lower than OpenAI’s claims. Flex processing was introduced for cheaper, slower AI tasks. OpenAI rolled out safeguards against biorisks for o3 and o4-mini models. The o3 and o4-mini reasoning models were launched, capable of web browsing, coding, and image processing. A new “library” section was added for easier access to AI-generated images. OpenAI said it would adjust safeguards if rivals released high-risk AI. The company began developing its own social media network. GPT-4.5 was scheduled for removal from the API in July. OpenAI unveiled GPT-4.1, GPT-4.1 mini, and GPT-4.1 nano models. GPT-4 was discontinued in ChatGPT on April 30. OpenAI updated ChatGPT to remember previous conversations for personalized responses. Watermarking for images was in development. OpenAI offered ChatGPT Plus for free to U.S. and Canadian college students through May. ChatGPT users generated over 700 million images since the upgraded image generator launched. Estimated costs for o3 were revised higher. Capacity issues due to image generation popularity caused product delays.
March 2025
OpenAI announced plans to release an open language model “in the coming months,” the first since GPT-2. The company removed restrictions on image generation, allowing images of public figures and hate symbols when requested. OpenAI adopted Anthropic’s Model Context Protocol (MCP) for all products, including the ChatGPT desktop app. Viral Studio Ghibli-style images raised copyright concerns. OpenAI projected revenue would triple to $12.7 billion in 2025. A major upgrade to ChatGPT’s image generation allowed GPT-4o to create and edit images directly. Leadership changes saw Brad Lightcap taking on global expansion and Mark Chen becoming chief research officer. Advanced Voice Mode was updated with real-time conversations and less interruption. OpenAI and Meta separately engaged in talks with Reliance Industries for AI distribution in India. A privacy complaint in Europe highlighted ChatGPT’s defamatory hallucinations. New transcription and voice-generating AI models were added to the API. OpenAI launched o1-pro, a more powerful reasoning model for developers. Research lead Noam Brown suggested reasoning models could have arrived decades ago. Altman posted that OpenAI trained a model “really good” at creative writing. New tools helped businesses build AI agents, including the Responses API. OpenAI reportedly planned to charge up to $20,000 per month for specialized AI agents for PhD-level research. ChatGPT gained the ability to directly edit code in Xcode, VS Code, and JetBrains on macOS. Weekly active users doubled in less than six months, reaching 400 million by February.
February 2025
OpenAI canceled the standalone o3 model in favor of a unified GPT-5 release. A revised analysis showed ChatGPT consumes only 0.3 watt-hours per query, less than often cited. o3-mini’s “chain of thought” was made more visible. ChatGPT web search became available without requiring login. OpenAI unveiled a deep research agent to conduct in-depth, multi-source research using ChatGPT.
January 2025
OpenAI used the subreddit r/ChangeMyView to test AI persuasion abilities. The company launched o3-mini, a new reasoning model. A report showed 85% of ChatGPT mobile users are male, with over half under 25. ChatGPT Gov was launched for U.S. government agencies, offering enterprise-level features with enhanced security. A Pew survey found 26% of teens used ChatGPT for schoolwork, double from 2023. OpenAI disclosed that deleted data from its Operator tool may be retained for 90 days. Operator, a general-purpose AI agent, was released in research preview. Changes in code suggested Operator would be available to Pro plan users. OpenAI tested phone number-only signups for ChatGPT in the U.S. and India. A new “tasks” feature allowed scheduling reminders and recurring tasks. Users could assign traits like “chatty” or “Gen Z” to customize interactions.
Source:TechCrunch News