GitHub Copilot and Microsoft 365 Copilot are different products billed on different contracts. GitHub Copilot Business ($19/user/month) and Enterprise ($39/user/month) target software developers writing code and live inside the GitHub estate. Microsoft 365 Copilot ($30/user/month) targets information workers reasoning over Word, Excel, PowerPoint, Outlook, and Teams content and lives inside the M365 estate. They are not substitutes for each other and the overlap is roughly 4–7% of the typical enterprise user base. The procurement mistake is treating them as one decision — they sit on different paper, with different commitment terms, different data boundaries, and different governance models.
GitHub Copilot vs M365 Copilot: they are not substitutes
GitHub Copilot vs Microsoft 365 Copilot is the most-asked Copilot question we hear from enterprise procurement teams in 2026, and the framing is usually wrong. The two products solve different problems, sit on different paper, and have non-overlapping user populations. GitHub Copilot is a developer productivity tool: it autocompletes code, generates tests, refactors functions, and runs against repositories in GitHub.com or GitHub Enterprise Cloud. Microsoft 365 Copilot is an information-worker productivity tool: it drafts emails, summarises meetings, generates spreadsheet formulas, and reasons over the Microsoft 365 substrate (Exchange, SharePoint, OneDrive, Teams).
The overlap is small. Developers also use Outlook and Teams; sales engineers occasionally read code. Inside a 10,000-employee enterprise the GitHub Copilot Enterprise population is usually 600–1,400 developers and the M365 Copilot population is usually the full information-worker base or a 20–40% subset of it. The two licensing decisions are made by different stakeholders — the engineering leader for GitHub, the COO or CDO for M365 — and they should be priced and negotiated separately.
GitHub Copilot SKUs in 2026
GitHub Copilot comes in four tiers in 2026:
- GitHub Copilot Free. Limited monthly completions, no organisational policy. Not for enterprise deployment.
- GitHub Copilot Pro. $10/user/month. Individual developer tier; no admin controls; not suitable for enterprise.
- GitHub Copilot Business. $19/user/month. Organisational policy, exclude-from-training commitment, IP indemnification, basic audit. The minimum enterprise SKU.
- GitHub Copilot Enterprise. $39/user/month. Adds Copilot Chat in GitHub.com, knowledge bases scoped to your repositories, custom models on private code, advanced audit. Requires GitHub Enterprise Cloud.
The procurement reality: most enterprises deploy GitHub Copilot Business; a subset of regulated industries and platform teams deploy Enterprise for the knowledge-base scoping and code-trained reasoning. Pricing is annual on the GitHub side, contracted via Microsoft Customer Agreement or via GitHub direct, sometimes attached to the EA as a non-paper SKU.
Microsoft 365 Copilot SKUs in 2026
Microsoft 365 Copilot is sold as a single $30 per user per month SKU on top of a qualifying M365 base (E3, E5, Business Standard, Business Premium, F1, F3 do not qualify; only the information-worker SKUs). With the July 2026 price changes the headline price holds at $30 but the qualifying base SKUs are repriced — see our M365 July 2026 price increase guide for the structural detail.
Adjacent Copilot SKUs sometimes get pulled into the comparison — Copilot Studio for building agents, Copilot for Sales, Copilot for Service, Copilot for Security. None of them substitute for either GitHub Copilot or M365 Copilot. The Copilot portfolio is wide and the procurement task is to decide which SKUs the organisation needs, not to collapse them into a single decision.
Data boundary: GitHub vs M365
The data boundary commitments are similar in shape but different in detail. GitHub Copilot Business and Enterprise commit that prompts and suggestions are not used to train the foundation models and that customer code is excluded from the training surface. The IP indemnification covers third-party copyright claims arising from generated suggestions (subject to policy compliance). Microsoft 365 Copilot commits that prompts and responses are not used to train the foundation models and that grounding data is processed inside the M365 tenant.
The key difference: GitHub Copilot reasons over your code repositories; the data-boundary commitment turns on the GitHub Enterprise Cloud tenancy isolation. Microsoft 365 Copilot reasons over your Microsoft Graph; the data-boundary commitment turns on the M365 tenant’s data residency. Two different tenants, two different commitments, two different audit surfaces. For a unified governance posture, both have to be configured separately.
Cost comparison — the populations matter
| Scenario | Developers (1,200) | Information workers (8,800) | Total annual |
|---|---|---|---|
| GitHub Copilot Business only | $273K (1,200 × $19 × 12) | — | $273K |
| M365 Copilot only (full IW base) | — | $3.17M (8,800 × $30 × 12) | $3.17M |
| Both, full deployment | $273K | $3.17M | $3.44M |
| Both, M365 Copilot 30% targeted | $273K | $950K (2,640 × $30 × 12) | $1.22M |
| GitHub Copilot Enterprise + M365 Copilot 30% | $562K (1,200 × $39 × 12) | $950K | $1.51M |
The single largest procurement lever is the M365 Copilot population size. Microsoft’s strong preference is full enterprise deployment; the buyer’s strong preference is targeted deployment to the 20–40% of users where M365 Copilot demonstrably moves work. The negotiation gap is the difference between $3.17M and $950K annually — a $2.2M decision point at 10,000 seats.
The contractual mechanics
GitHub Copilot Business and Enterprise are typically billed monthly per active user, with annual commitments available. They can be added to an EA as a non-paper subscription, billed through MCA-E, or contracted direct with GitHub. The flexibility cuts both ways: easy to add, easy to grow, no contractual price protection on the GitHub side unless explicitly negotiated.
Microsoft 365 Copilot is sold with a 12-month minimum commitment per seat regardless of channel. Added to an EA, it follows the EA term and benefits from EA price protection. Added via CSP, it follows the CSP commitment terms — see our CSP renewal process 2026 changes coverage for the relevant lock-in dynamics.
Anonymised case study: $1.3M Copilot avoidance
A 14,000-employee professional-services firm proposed a full-base M365 Copilot rollout alongside a GitHub Copilot Enterprise rollout, projected at $5.4M annually. We modelled the actual decision-support need against the user base and recommended GitHub Copilot Business for 1,800 developers, GitHub Copilot Enterprise for a 230-person platform team, and M365 Copilot targeted to a 2,400-user partner-and-manager subset. The negotiated annual cost was $1.49M — a $1.3M avoidance against the unsegmented proposal, with the option to expand the M365 Copilot population at the next anniversary if Copilot for M365 MAU exceeded 75% on the targeted population. Twelve months later MAU was 71% and the firm expanded the population by 1,400 users at the EA renewal at a 12% Copilot-specific discount.
GitHub Copilot vs Microsoft 365 Copilot is two decisions, not one. Price them separately, scope them separately, and negotiate them separately. Layer the analysis with the Copilot Studio 2026 framework and the EA tier-collapse renewal landscape, and the Copilot portfolio stops behaving like a $30 add-on and starts behaving like the structural license decision it actually is.