OpenAI says GPT 5.6 is the ‘preferred model’ for Microsoft Copilot 365 amid breakup chatter

What did OpenAI actually announce?

On 9 July 2026, OpenAI confirmed that GPT 5.6, a family of three models called Sol, Terra and Luna, is the "preferred model" behind Microsoft 365 Copilot across Word, Excel, PowerPoint, Copilot Chat and the newer Cowork feature. The statement came days after Bloomberg reported Microsoft was quietly swapping in its own in-house MAI models to cut costs.

This matters because it exposes something most small business owners assume is fixed: that "Copilot" means one consistent AI engine. It does not. Microsoft can now mix and match models, and the one answering your questions in Word today might not be the one answering next quarter.

Are Microsoft and OpenAI actually splitting up?

No, but the relationship has changed shape. The restructured deal gives Microsoft a licence to OpenAI's models through 2032, but that licence is now non-exclusive, meaning Microsoft is free to blend in its own models or third-party ones wherever it suits them commercially.

For a small business, "non-exclusive licence" translates to one practical fact: the AI inside your Microsoft subscription is not a fixed product. It is a moving target that Microsoft will keep tuning for its own cost and performance reasons, not yours.

Should this change what I pay for Copilot?

Not on its own, but it is a good moment to check you are not overpaying. Microsoft 365 Copilot Business costs £16.10 per user per month as a standalone add-on (a promotional £13.80 rate runs to 30 September 2026), but since 1 July 2026 Copilot has also been bundled into Business Standard and Business Premium at £7.30 per user per month extra, roughly half the standalone price.

If you already pay for the standalone add-on, check whether upgrading your existing Business Standard or Premium plan gets you the same Copilot access for less. Many small businesses are still on the old pricing simply because nobody went back to check.

Does the model swap actually affect my day to day work?

Probably not noticeably yet, since OpenAI's models remain the default. But it is a signal worth watching if you rely on Copilot for anything client facing, like drafting quotes, summarising calls, or building proposals, where tone and accuracy consistency matter.

The bigger lesson is about dependency. UK government's own cross-government Copilot trial found an average saving of 26 minutes per person per day with 83% adoption at peak, so the productivity case is real. But that saving sits on top of a platform you do not control the roadmap of.

What should local businesses actually do about this?

Use Copilot and similar tools for what they are good at, drafting, summarising, tidying spreadsheets, but do not build your core customer operations, like bookings or lead capture, on top of a subscription you cannot influence.

• Audit which Copilot plan you're actually on and whether the bundled £7.30 route beats your current add-on cost.
• Keep customer data, bookings and website content on infrastructure you own, not inside a Microsoft or third-party AI layer that could change behaviour overnight.
• Treat AI assistants as a productivity tool for internal work, not as the foundation your business runs on.

Is this part of a bigger shift in how customers find local businesses?

Yes, and it is the part most owners are missing. The ONS Business Insights and Conditions Survey (15 to 28 June 2026) found 29% of UK businesses now use at least one AI technology, while BCC research from March 2026 put generic AI tool usage among SMEs at around 94%. AI is no longer a novelty, it is infrastructure.

That means how ChatGPT, Gemini and Google AI Overviews describe your business is becoming as important as your Google ranking. St Andrews University research from mid 2026 found UK SMEs adopting AI seeing productivity gains between 27% and 133%, but those gains only compound if your underlying data (your website, your Google Business Profile, your booking records) is clean and yours to control.

What's Braynex Services' take on all this?

The Microsoft-OpenAI reshuffle is a preview of what happens when you rent your core business tools instead of owning them. We see this pattern constantly with local businesses: a salon paying Fresha roughly £1,800 a month in commission before moving to its own booking system at £35 a month, saving around £21,000 a year, or a plumber spending £280 a month on Yell for 3 leads who switched to a Google Business Profile plus a small ads campaign at £120 a month and now gets 18 to 22 enquiries monthly.

In every case, the moment the business stopped renting someone else's platform and started owning its own booking system, website or customer data, the terms stopped being decided for them. Copilot users are learning that lesson right now: the model underneath your daily tools can change without your input. The businesses least affected by this kind of shift are the ones whose customer relationships, bookings and data do not depend on any single vendor's roadmap.

Being findable and recommended by AI assistants is becoming the new local SEO, but that only works if what those assistants find is accurate, owned, and under your control, not locked inside someone else's subscription.

Want a clear picture of what you actually own versus rent?

If you are not sure how much of your business, bookings, customer data, online presence, sits on platforms you do not control, Braynex Services offers a free audit. Book yours at braynexservices.com.