GPT-5 turning one as OpenAI shares new Agent Plugins standard
OpenAI’s GPT-5 turns one tomorrow, and the company is marking the week by looking beyond individual models. Today, OpenAI introduced Agent Plugins, an open standard meant to let reusable AI-agent extensions work across compatible products.
GPT-5, OpenAI's latest model, turns one year old tomorrow. To celebrate, the company unveiled Agent Plugins, an open standard allowing reusable AI-agent extensions to function across various products. GPT-5 replaced GPT-4o and other reasoning models as ChatGPT's default on August 7, 2025. Its automatic routing feature enabled ChatGPT to quickly respond to queries or employ deeper reasoning based on the request.
Additionally, fewer factual errors were reported with GPT-5 compared to GPT-4o. Apple integrated GPT-5 into its iOS 26, iPadOS 26, and macOS Tahoe 26 updates, with ChatGPT requests flowing through Apple Intelligence, including Siri handoffs, Writing Tools, and visual intelligence. GPT-5.1 was expected to deliver warmer, more natural responses in November, while GPT-5.2 was released in December to enhance professional work following Gemini advancements.
GPT-5.3 focused on ChatGPT's "cringe" tone, followed a day later by GPT-5.4 Thinking, which introduced a million-token context window and built-in computer usage. OpenAI then released GPT-5.4 mini and nano, a restricted version of GPT-5.4, as well as GPT-5.5 for more autonomous work and GPT-5.6 Sol, Terra, and Luna models. The software surrounding these models also evolved, with OpenAI launching a dedicated Codex Mac app in February to manage multiple coding agents, review changes, and schedule tasks.
By July, Codex had become the new ChatGPT desktop app, merging Chat, Work, and Codex capabilities while the previous client was renamed ChatGPT Classic.
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