GPT-5.6 Sol becomes Microsoft 365 Copilot's preferred model on launch day

breakthroughDeveloperEnterprise

Friday, July 10, 2026

Confidence

High · — primary sources from both vendors, distribution confirmed

Evidence

OpenAI launch page + GitHub Changelog + Inc42

OpenAI shipped the GPT-5.6 family in three tiers — Sol, Terra, Luna — and it landed simultaneously as the preferred model inside Microsoft 365 Copilot and as a user-selectable option in GitHub Copilot.

The details

GPT-5.6 is the preferred model powering Microsoft 365 Copilot; API pricing starts at $1 per million input tokens for Luna, $2.50 for Terra and $5 for Sol , per Inc42's coverage of the launch.
GPT-5.6 Sol, Terra and Luna are rolling out in GitHub Copilot with Sol pitched for complex reasoning over large codebases and long-running agentic work , per the GitHub Changelog.

What it means

The Microsoft-builds-its-own-model story was wrong. Two weeks after Bloomberg reported Microsoft testing its own MAI models to cut OpenAI dependency, GPT-5.6 shipped as the preferred model inside 365 Copilot on release day. The lock-in deepened. Any competitor pitching a coding-model swap into a Microsoft shop must now beat a model one dropdown click away.

GPT-5.6 is the preferred model powering Microsoft 365 Copilot; API pricing starts at $1 per million input tokens for Luna, $2.50 for Terra and $5 for Sol , per Inc42's coverage of the launch.
GPT-5.6 Sol, Terra and Luna are rolling out in GitHub Copilot with Sol pitched for complex reasoning over large codebases and long-running agentic work , per the GitHub Changelog.

Sources

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Stat of the Day

$2.5B▲

Microsoft Frontier Company

Microsoft's commitment to a 6,000-person forward-deployed AI unit — the largest single-vendor push into AI implementation services yet announced. Source

Today’s Take

Thursday was the day OpenAI stopped acting like an API vendor. A persistent workplace agent, a three-tier frontier model family, and preferred-model status inside the world's most-deployed enterprise Copilot arrived together, and Microsoft's own $2.5B professional-services build-out from the week prior reads as the distribution partner reinforcing the moat around itself. The FT export-controls story is the other side of that coin: US labs are now enterprise incumbents big enough that their sales-channel decisions are foreign policy. Watch what does not happen next — whether the government-tuned frontier lab that just cleared a security review starts to look less like a company and more like critical infrastructure, and whether Anthropic's stricter China posture becomes the regulatory floor rather than a competitive stance. Considered and passed: the IKS Health–TruBridge $557M deal (a rural-hospital consolidation with a thin AI angle) and the Deutsche Telekom OpenAI case study (lab-authored blueprint, no independent corroboration).

— Agentic desk

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