A March 29 Hacker News thread amplified a reverse-engineering report claiming that ChatGPT uses Cloudflare Turnstile to inspect not only browser fingerprints but also React hydration state before conversation requests. The bigger question is whether application-layer attestation is becoming normal in AI web apps.
OpenAI said on March 23, 2026 that ChatGPT now stores uploaded and created files in a persistent File Library for reuse across conversations. OpenAI's official release notes say the Library is web-only for now, while recent files and file search are also available on iOS and Android, with rollout underway for Plus, Pro, and Business users globally and the EEA, Switzerland, and the UK coming soon.
OpenAI is rolling out richer shopping in ChatGPT with visual browsing, side-by-side comparison, and up-to-date product data. The company is expanding ACP for discovery, bringing retailers, Shopify Catalog, and a new Walmart in-ChatGPT app experience into the flow.
OpenAI said on X on March 17, 2026 that GPT-5.4 mini was available in ChatGPT, Codex, and the API. The launch positions mini as a faster coding and multimodal workhorse, while OpenAI’s accompanying post also introduces GPT-5.4 nano for cheaper API-only workloads.
OpenAI said on X on March 23 that ChatGPT is getting a new Library for uploaded and created files. The rollout adds reusable file storage, recent-file insertion, and broader document continuity across chats.
OpenAI introduced Lockdown Mode and Elevated Risk labels for ChatGPT on February 13, 2026. The changes are designed to give high-risk users stronger controls and make security tradeoffs more explicit as AI products connect to the web and external apps.
OpenAI is rolling out dynamic visual explanations for more than 70 core math and science concepts in ChatGPT. The feature is available globally across all plans and is meant to turn formulas, variables, and graphs into interactive learning modules.
OpenAI says GPT-5.4 Thinking and Pro are rolling out gradually across ChatGPT, the API, and Codex. The company positions GPT-5.4 as a unified frontier model for professional work with stronger coding, tool use, and 1M-token context.
OpenAI says GPT-5.4 Thinking is shipping in ChatGPT, with GPT-5.4 also live in the API and Codex and GPT-5.4 Pro available for harder tasks. The launch packages reasoning, coding, and native computer use into a single professional-work model with up to 1M tokens of context.
OpenAI introduced ChatGPT for Excel on March 5, 2026. The feature targets paid ChatGPT users and adds spreadsheet-native analysis and formula generation, plus financial data connectivity for regulated workflows.
OpenAI introduced ChatGPT for Excel on March 5, 2026. The feature targets paid ChatGPT users and adds spreadsheet-native analysis and formula generation, plus financial data connectivity for regulated workflows.
OpenAI announced that GPT-5.4 Thinking and GPT-5.4 Pro are rolling out in ChatGPT, while GPT-5.4 is already available in the API and Codex. The launch positions GPT-5.4 as a unified frontier model for reasoning, coding, and agentic workflows.