Which AI is best for writing, research, and images
No independent, published test tells you which AI is best for your own writing or research, so choose by features. For research with sources, use Perplexity or the deep research modes of the others. For images, use ChatGPT, Gemini, or Copilot, since Claude does not generate them. For email and documents, start with the assistant inside your office suite, and test two on your own drafts.
Which AI is best for which task at work
Choose by the features a task needs, not by a ranking. The tasks people use AI for at work are well documented: in the US, the Census Bureau found that workers who used AI most often looked up information, wrote, generated ideas, or summarized and translated. Which assistant suits each job depends on a few published features, and that is how this page completes choosing an AI assistant for work.
We did not find an independent test, with a published method, that ranks these assistants on everyday business tasks, and benchmarks published by the companies themselves are marketing material, not independent tests. So this page compares only what each company publishes, as of November 10, 2026.
Task by task
| Task | What matters | Assistants with the feature |
|---|---|---|
| Drafting emails and documents | Working where you already write | Gemini in Gmail and Docs; Copilot in Outlook and Word; ChatGPT through Office and Google Sheets extensions; Claude creates Word, Excel, PowerPoint, and PDF files on every plan |
| Summarizing long documents | How many files, and how large | Claude: PDFs up to 1,000 pages, 20 files per chat; Gemini: 10 files per message, 100 MB each; ChatGPT: large documents, but three uploads a day on the free plan; Copilot: your organization’s files with the paid license |
| Research with sources | Citations and long reports | Perplexity, built around citations; deep research in ChatGPT, Gemini (free plan included), and Claude (paid plans); Researcher in Microsoft 365 Copilot (paid license) |
| Images for social media or slides | Image generation | ChatGPT, Gemini, and Copilot; Perplexity on paid plans; Claude makes diagrams and charts only |
| Spreadsheets | Working inside Excel or Sheets | Gemini in Sheets; Copilot in Excel, with the Analyst agent on the paid license; ChatGPT extensions for Excel and Google Sheets; Claude reads and creates Excel files |
| Meeting notes | Your meeting tool | Copilot in Teams; Gemini note-taking in Google Meet on Workspace Business Standard |
| Longer tasks done for you | An agent you can supervise | ChatGPT Work; Claude Cowork (paid plans); Copilot Cowork (paid license); Tasks in Gemini (Pro and Ultra, some countries); Perplexity Computer |
Writing: test on your own drafts
Writing quality depends on your instructions, your examples, and how much you edit, more than on any single score. Take two real pieces of work, such as a client email and a page of a proposal, and give the same instructions to two assistants. Keep the one whose drafts need fewer corrections, and remember that the assistant inside your office suite saves the copying and pasting.
Research: the sources are still yours to check
Citations make checking possible, not unnecessary. NIST notes that generative AI can produce invented reasoning or citations to justify an answer, a form of what it calls confabulation. Before you reuse a figure, open the cited page and find it yourself, and prefer an official source over a summary of one.
Images: check the rights before you publish
ChatGPT, Gemini, and Copilot generate images, with limits on their free plans; Gemini’s downloads are 1K without a paid plan and 2K with one. Anthropic says Claude does not generate photos or illustrations. Who owns an AI image, and whether you can use it in an ad, depends on the terms and the law of your country, which a separate guide of this series covers.
Spreadsheets and meetings: stay in your suite
For spreadsheets and meeting notes, the assistant built into your tools usually wins on convenience: Gemini in Sheets and Meet for Workspace users, Copilot in Excel and Teams for Microsoft 365 users. Microsoft notes that Copilot can edit a workbook only when calculation is set to Automatic; it works with AutoSave on or off.
Run a real test
Our page on ChatGPT and Claude side by side includes a one-week test you can apply to any pair of assistants.
When research is the main job
If most of your use is looking things up, read what Perplexity does differently before you settle on a general assistant.
Start without paying
Several of these features are available for free. See what each free plan includes.