OpenAI has expanded its enterprise AI strategy with the launch of GPT-5.6 and ChatGPT Work, while announcing that its latest flagship model will become the default AI model powering Microsoft 365 Copilot.
The move deepens OpenAI's partnership with Microsoft and brings GPT-5.6 to productivity applications including Word, Excel, PowerPoint, Copilot Chat, and Cowork, giving enterprise users access to improved reasoning, coding, content creation, and workflow automation without changing the applications they already use.
The announcement comes as competition intensifies among enterprise AI platforms, with Microsoft, Google, Anthropic, and Amazon racing to embed AI deeper into workplace productivity tools.
Microsoft 365 Copilot Gets GPT-5.6
OpenAI said GPT-5.6 will become the preferred model across Microsoft 365 Copilot, helping users draft documents, analyse spreadsheets, build presentations, and collaborate across teams with improved accuracy and efficiency.
According to Microsoft, the model is designed to deliver higher-quality outputs while using computational resources more efficiently, enabling users to complete complex tasks with fewer prompts.
In Word, GPT-5.6 can assist with drafting and refining documents. In Excel, it supports deeper data analysis, while PowerPoint users can generate more polished presentations from early ideas. The model also strengthens Cowork by helping teams complete cross-functional projects with less manual coordination.
"We can't wait for customers to see what GPT-5.6 in Microsoft 365 will do," said Nitin Agrawal, President, Copilot & Agents Core, Microsoft, adding that the update will help users create documents, analyse data, develop presentations, and collaborate more effectively using AI.
ChatGPT Work Targets Knowledge Workers
Alongside the model launch, OpenAI introduced ChatGPT Work, a workspace that combines ChatGPT with its coding platform, Codex, to automate a wide range of enterprise tasks.
The platform enables users to generate presentations, reports, spreadsheets, software, and websites from a single interface while supporting browser automation, scheduled tasks, and multi-step workflows.
Unlike traditional AI assistants that primarily answer questions, ChatGPT Work is designed to execute complete workflows by coordinating tools, maintaining project context, and automating repetitive business processes.
Three Models for Different Enterprise Workloads
GPT-5.6 is available in three variants: Sol, the flagship model for advanced reasoning and coding; Terra, designed for balanced performance and cost; and Luna, optimised for high-volume, lower-cost workloads.
OpenAI has also introduced configurable reasoning modes, including Ultra, which uses multiple AI agents to execute complex tasks in parallel. The company says the capability improves software engineering, research, and long-running enterprise workflows while reducing manual intervention.
Developers can also access new API capabilities such as programmatic tool calling, enabling AI applications to independently coordinate tools and manage intermediate workflows.
Enterprise AI Competition Beyond Chatbots
The launch highlights how enterprise AI is evolving from conversational assistants into integrated productivity platforms capable of completing end-to-end business workflows.
Microsoft's adoption of GPT-5.6 across Microsoft 365 strengthens OpenAI's position in enterprise productivity, while ChatGPT Work places the company in more direct competition with Anthropic's Claude Cowork, Google Gemini for Workspace, and Amazon Q Business.
For enterprises, the focus is increasingly shifting from deploying standalone AI models to adopting AI systems that can automate research, software development, document creation, collaboration, and operational workflows within existing business applications. GPT-5.6 is rolling out across ChatGPT, Codex, the OpenAI API, and Microsoft 365 Copilot, with availability expanding in phases across enterprise and commercial subscription plans.
