Yes… Microsoft are updating Microsoft 365 Copilot with support for GPT-5 across the Microsoft Al stack. This is live now and rolling out across Microsoft 365 Copilot and Copilot Studio after being made available to “Insiders” on Copilot consumer/personal last week.
This quick incorporation of GPT-5 into Copilot underscores Microsoft’s pledge to integrate OpenAI’s cutting-edge models into the their AI products within 30 days of availability.
What is so great about GPT-5?
GPT-5 in Copilot is built on a dual-engine (think two brain approach) architecture designed to better align to the way humans think. It will. Adapt the “mode” based on the ask and type of response of work needed.
- Real-time routing: rather having to choose the model (such as deep thinker or research), for every prompt, Copilot now automatically evaluates the prompt and it’s complexity and then selects the ideal GPT-5 sub-model for the response.
- High-throughput model : Tackles routine tasks quickly, delivering succinct answers to straightforward requests.
- Deep-reasoning model: Which engages when advanced analysis or creativity is needed, taking time to plan, verify context, and ensure accuracy before responding.
This adaptive model selection brings together speed and depth, and can change within the same conversation. This means as your conversation with Copilot evolves so does the way it responds, without the user having to change modes.
Open AI’s CEO Sam Altman said that “the new model, GPT-5, is its smartest and fastest to date with wide-ranging improvements to ChatGPT’s skills in areas like coding, writing and taking on complex actions.”
How GPT-5 in Copilot shifts the conversation.
GPT-5 builds on GPT-4 with:
- A vastly expanded context window (up to 100K tokens) – on average a token is equivalent to about four characters of an English word.
- Improved reasoning and multi-step problem solving without having to manually choose the model up front. Can also switch dynamically in the same conversation.
- Enhanced memory and recall capabilities
- Support for multimodal inputs (text, image, audio)… Note output is still text!
- Faster, and much more accurate responses
Copilot with GPT-5 isn’t just smarter—it’s more practical too. The increased token input also means it can handle entire project folders, analyse longer documents, and deliver context-aware outputs that feel tailored to your workflow and chosen format.
Image a scenario where I ask Copilot to “Summarise a new solution proposition“. This would trigger GPT-5’s high-throughput route, scanning the document or documents to return a concise summary as per the ask.
When I then ask Copilot to “review this against best practise examples, and make suggestions fornimprovement and then create me a ‘better’ version based on your suggestions“, Copilot will seamlessly switch to use it’s deep reasoning mode. You know it has switched modes as you literally see it think.
GPT-5 Agents in Copilot Studio
People or teams building specialised workflows or agents in Copilot Studio now also get support for GPT-5 which is now the primary engine for custom agents.
GPT-5 better enables agents to tackle more complex processes like compliance audits or financial modeling with greater precision and contextual awareness than previous GPT powered agents.
How to use GPT-5 in Microsoft 365 Copilot
GPT-5 support in Copilot is available now for licensed Microsoft 365 Copilot users. Once rolled out to your environment, users will see a new “Try GPT-5 button” in Copilot Chat. Once activated, Copilot will leverage GPT-5 across your work and web data by default.
A Microsoft 365 Copilot License grants priority access, with broader rollout to Copilot Chat only users rolling out over the next few weeks.
Is it better?
My suggestions
Compare a prompt such as: “Summarise my emails from the last week, determine which ones require actions and break them down into high impact, low impact and trivial based on your analysis“.
Try this and try this again with GPT-5 enabled.
Try longer prompts…you can essentially now. Feed Copilot with…
- A full business proposal
- A multi-tab Excel workbook
- A folder of Markdown files or code
- A long-form research paper with citations
…it can handle all of it in one prompt, as long as the total token count stays under 100K.
It’s important to note that the prompt is just part of the context window. The model also needs room for its response. So if you use 80,000 tokens for input, you’ll have ~20,000 tokens left for output. Hopefully that makes sense.!
This isn’t just summarising anymore—it’s deep analysis, synthesis, and contextual understanding across dozens (or hundreds) of pages.
Read more here: https://www.microsoft.com/en-us/microsoft-365/blog/2025/08/07/available-today-gpt-5-in-microsoft-365-copilot/