8OpenAI Blog·
GPT-5.6 becomes preferred model powering Microsoft 365 Copilot
OpenAI announced that GPT-5.6 is now the preferred model in Microsoft 365 Copilot, replacing the prior default across Word, Excel, PowerPoint, Chat, and Cowork. The deployment represents a major enterprise rollout of a new OpenAI model to Microsoft's productivity suite. This signals both a new model version (GPT-5.6, superseding GPT-5.5 per current canonical facts) and a significant deepening of the OpenAI-Microsoft partnership at scale.
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GPT-5.6 wider API release imminent after government delay; roundup covers Microsoft MAI shift, Claude Cowork mobile, Nvidia Audex, OpenAI mini voice
OpenAI's GPT-5.6 models are set for broader API release following a Department of Commerce-approved safety review that delayed launch for weeks; GPT-5.6 Sol Ultra scores 91.9% on TerminalBench 2.1 versus Claude Mythos 5 at 88%, with pricing roughly half of Anthropic's comparable tier. Microsoft is actively replacing OpenAI and Anthropic models in Excel, Outlook, and Teams with its internally built MAI models to reduce third-party dependency as its OpenAI discount partnership nears expiration. Anthropic expanded Claude Cowork to web and mobile for Max plan subscribers, with usage data from 1.2 million sessions showing over 90% of use is non-developer work. Nvidia released Audex, a 30B MoE audio-text model that avoids the typical 'text tax' of multimodal models, shipping under a noncommercial license.
OpenAI rolls out GPT-5.5 support and new controls for ChatGPT workspace agents
OpenAI is expanding ChatGPT workspace agents for Enterprise and Edu customers with several new capabilities, including support for GPT-5.5 with configurable reasoning effort, role-based publishing permissions, guided setup flows, speech output, and smarter Slack thread handling. The update gives enterprise admins finer-grained control over agent deployment and expands the modalities agents can produce. These changes position ChatGPT agents more directly as a managed enterprise automation layer.
OpenAI rolls out GPT-5.5 Instant as ChatGPT's new default model
OpenAI is replacing GPT-5.3 Instant with GPT-5.5 Instant as the default model for all ChatGPT users, citing improvements in accuracy, clarity, image understanding, STEM, and web search decisions. The update also reduces overformatting and unnecessary follow-up questions, and adds better context retention from past chats, files, and Gmail for Plus and Pro users. GPT-5.3 Instant remains available for paid users for three months before retirement.
OpenAI releases GPT-5.6, a new frontier model
OpenAI announced GPT-5.6, a new flagship model positioned as offering more intelligence per token, stronger performance per dollar, and increased capability for demanding tasks. The release is framed around efficiency and scalability alongside raw capability. This supersedes GPT-5.5 as OpenAI's current flagship.
GPT-5.5 Instant: smarter, clearer, and more personalized
OpenAI has released GPT-5.5 Instant as the new default model for ChatGPT, succeeding the prior default with claims of smarter and more accurate responses, reduced hallucinations, and improved personalization controls. The announcement positions this as an incremental but meaningful update to the flagship consumer product. No architectural or training details are provided in the announcement body.
OpenAI releases GPT-5.5 and GPT-5.5 Pro to the API with 1M token context and built-in agentic tools
OpenAI released GPT-5.5 and GPT-5.5 Pro to the Chat Completions and Responses API, positioning them as frontier models for complex professional work and compute-intensive tasks respectively. GPT-5.5 supports a 1M token context window, image input, structured outputs, function calling, built-in computer use, hosted shell, MCP, web search, and Skills. Notable behavioral changes include reasoning effort defaulting to medium and extended-only prompt caching support.
Introducing GPT-5.2
OpenAI has released GPT-5.2, described as their most advanced frontier model for professional use, featuring state-of-the-art reasoning, long-context understanding, coding, and vision capabilities. The model is available through ChatGPT and the OpenAI API. It is positioned to support faster and more reliable agentic workflows.
Introducing GPT-5.4
OpenAI has released GPT-5.4, described as their most capable and efficient frontier model targeting professional work. The model features state-of-the-art coding, computer use, and tool search capabilities, along with a 1 million token context window. This represents a significant capability and efficiency advancement over prior GPT-5 series models.