Microsoft sets GPT‑5.6 default

Microsoft has told developers working on internal AI coding projects to use OpenAI’s GPT-5.6 Sol as the default model in GitHub Copilot, according to a CNBC report published August 5. The guidance came in a memo from Jay Parikh, executive vice president of Microsoft’s CoreAI engineering group, and framed the move as a way to standardize internal use of the company’s top OpenAI-backed coding model. CNBC said the memo was viewed by the outlet and applied to Microsoft staff working on AI coding tasks. The decision ties together several strands of Microsoft’s AI strategy. Microsoft has already made GPT-5.6 broadly available across other products, including Microsoft 365 Copilot and Microsoft Foundry, where the company has described the model family as part of its production AI stack. GitHub Copilot, meanwhile, supports multiple models and routes prompts through GitHub’s own filtering and code-matching systems. (cnbc.com) ### What exactly changed inside Microsoft? CNBC reported that Parikh told Microsoft coders to default to GPT-5.6 Sol rather than rival models when working on AI coding projects. The memo described the change as an internal efficiency measure tied to Microsoft’s commercial relationship with OpenAI and the company’s existing token commitments. (techcommunity.microsoft.com) Parikh wrote that “shifting more workloads to OpenAI models helps us get greater value from our token investment,” CNBC reported. That wording matters because it places the decision in operational terms: not a public product launch, but an internal default for employees already using GitHub Copilot in day-to-day engineering work. (cnbc.com) ### Why GPT-5.6 Sol, and not another model? OpenAI introduced GPT-5.6 Sol in July as the highest-end model in a three-model family that also includes Terra and Luna. CNBC reported on July 9 that OpenAI Chief Executive Sam Altman said Sol was 54% more token-efficient on agentic coding tasks, while Microsoft’s Azure and Foundry materials describe Sol as the frontier option in the lineup. (cnbc.com) Microsoft has also been integrating GPT-5.6 across its software stack. A Microsoft 365 Copilot blog post on July 9 said GPT-5.6 became the preferred model for Microsoft 365 Copilot, while Microsoft Foundry said the full GPT-5.6 family was generally available for enterprise developers and agents. The internal Copilot move therefore extends an existing product pattern into Microsoft’s own engineering workflows. (cnbc.com) ### Does this mean GitHub Copilot is now tied only to OpenAI? GitHub’s documentation says Copilot supports multiple AI models, not just OpenAI systems. The supported-models page lists a range of available models, and GitHub’s hosting documentation says prompts and completions continue to pass through Copilot content filters, with zero data retention agreements in place for OpenAI-hosted requests. (techcommunity.microsoft.com) That distinction matters because Microsoft’s memo, as described by CNBC, sets an internal default for its own staff rather than eliminating model choice across GitHub Copilot as a product. Microsoft has previously expanded Copilot beyond OpenAI models, including support for Anthropic and Google options. (docs.github.com) ### How does this fit Microsoft’s broader AI posture? Microsoft has been balancing two tracks in 2026: deeper deployment of OpenAI models and parallel investment in its own AI systems. CNBC reported in June that Microsoft unveiled MAI-Code-1-Flash, its first coding model, as part of a push to reduce dependence on outside providers and lower developer costs. (cnbc.com) At the same time, Microsoft has continued to push OpenAI’s newest systems into customer-facing products. Its July announcements for Microsoft 365 Copilot and Foundry both emphasized enterprise deployment, security controls and production use cases, suggesting the company sees frontier OpenAI models as part of its current commercial stack even while building alternatives. (cnbc.com) ### What should readers watch next? GitHub’s documentation pages will show whether supported-model options or default-selection behavior change further in Copilot. Microsoft’s next public signals are likely to come through product documentation, developer events or additional internal guidance from CoreAI leaders such as Parikh, while OpenAI pricing and model updates remain another variable for how widely GPT-5.6 Sol is used inside Microsoft and by outside Copilot customers. (techcommunity.microsoft.com) (docs.github.com)