Microsoft Copilot or GPT-5.5?
Choose Microsoft Copilot when word, excel, powerpoint, outlook and microsoft 365 workflows is the closer match. Choose GPT-5.5 when existing gpt-5.5 production workflows and migration baselines matters more. Test both on the same real tasks before moving a production workflow.
Word, Excel, PowerPoint, Outlook and Microsoft 365 workflows
Existing GPT-5.5 production workflows and migration baselines
Microsoft Copilot
Word, Excel, PowerPoint, Outlook and Microsoft 365 workflows
Official specification ↗GPT-5.5
Earlier flagship model for coding and complex professional work.
Official specification ↗Side-by-side comparison
| Category | Microsoft Copilot | GPT-5.5 |
|---|---|---|
| Provider | Microsoft | OpenAI |
| Type | Product · Productivity | Model · Reasoning model |
| Pricing summary | Free options; Microsoft 365 Personal $9.99/mo; Premium $19.99/mo in US reference | $5 input, $0.50 cached input and $30 output per 1M tokens |
| Input price | Product or plan pricing | $5 / 1M tokens |
| Cached input | Not directly comparable | $0.50 / 1M tokens |
| Output price | Product or plan pricing | $30 / 1M tokens |
| Context window | Varies by included model and plan | 1.05M tokens |
| Maximum output | Varies by included model and surface | 128K tokens |
| Knowledge cutoff | Model-dependent; web access may add current information | December 1, 2025 |
| Reasoning | Varies by selected model or mode | none, low, medium, high, xhigh |
| Relative speed | Varies by model, plan and workload | Moderate |
| Input modalities | See documented product features | Text and image |
| Output modalities | See documented product features | Text |
| Tools and integrations | Web-grounded Search and Deep Research; Memory, Actions and Copilot Vision; Word, Excel, PowerPoint, Outlook and Teams workflows; Microsoft Graph and Windows integration | Functions, web search, file search, computer use and supported Responses API tools |
| API / access | Product surface; see official source for API availability | v1/responses, v1/chat/completions and v1/batch |
| Best fit | Word, Excel, PowerPoint, Outlook and Microsoft 365 workflows | Existing GPT-5.5 production workflows and migration baselines |
| Company | Microsoft | OpenAI |
| Product category | Product · Productivity | Model · Reasoning model |
| Current pricing note | Free options; Microsoft 365 Personal $9.99/mo; Premium $19.99/mo in US reference | $5 input, $0.50 cached input and $30 output per 1M tokens |
| Best suited to | Word, Excel, PowerPoint, Outlook and Microsoft 365 workflows | Existing GPT-5.5 production workflows and migration baselines |
| Key capabilities | Web-grounded Search and Deep Research; Memory, Actions and Copilot Vision; Word, Excel, PowerPoint, Outlook and Teams workflows; Microsoft Graph and Windows integration | 1.05M context; 128K maximum output; Vision input; Responses API tools |
| Last verified | 2026-08-24 | 2026-09-08 |
| Official product source | https://www.microsoft.com/microsoft-365-copilot/pricing/individuals | https://developers.openai.com/api/docs/models/gpt-5.5 |
How we reached this verdict
We looked at the things that affect everyday use: what each product can do, how its plans are structured, where it fits into your existing workflow, and what the provider currently documents. Benchmark results are useful context, but they are not a universal winner score because test settings and tools vary.
Common questions
Microsoft Copilot or GPT-5.5: which should I choose?
Choose Microsoft Copilot for word, excel, powerpoint, outlook and microsoft 365 workflows. Choose GPT-5.5 for existing gpt-5.5 production workflows and migration baselines. Validate the decision with your own prompts and total task cost.
Is Microsoft Copilot cheaper than GPT-5.5?
Pricing units can differ. Microsoft Copilot: Free options; Microsoft 365 Personal $9.99/mo; Premium $19.99/mo in US reference. GPT-5.5: $5 input, $0.50 cached input and $30 output per 1M tokens. Check tool charges, plan limits, caching and long-context rules before comparing totals.
Which is better for coding and agent work?
Capability depends on the selected product surface, tools and harness. Microsoft Copilot is positioned for word, excel, powerpoint, outlook and microsoft 365 workflows; GPT-5.5 is positioned for existing gpt-5.5 production workflows and migration baselines. Run the same repository task on both.
How do their context windows compare?
Microsoft Copilot lists Varies by included model and plan; GPT-5.5 lists 1.05M tokens. A larger limit does not by itself guarantee better retrieval or lower cost.
Official sources
Use these provider pages to confirm current features, pricing and availability.
AI tools change quickly. We checked this page on 2026-09-08. Before you subscribe, confirm the latest price, regional availability and usage limits on the provider website.