Both Slack and Microsoft Teams have integrated AI features into their core communication platforms. If you’re choosing between them or evaluating whether the AI add-ons are worth it, this comparison helps.
Quick Setup
Slack AI is an add-on to existing Slack plans — $10/user/month on top of your Slack subscription. It adds channel summaries, thread summaries, and search intelligence.
Microsoft Teams Copilot is part of Microsoft 365 Copilot ($30/user/month add-on to M365). It includes meeting intelligence, chat summaries, and broader M365 integration.
Slack AI
What It Does
Channel summaries. The most-used feature: get a summary of what happened in a busy channel while you were away. “Catch me up on #engineering in the last 8 hours” generates a digest of key discussions.
Thread summaries. Long threads with 50+ replies get AI summaries. Instead of reading the whole thread, get the key points and decisions.
AI search. Ask Slack questions in natural language: “What did we decide about the Q4 launch date?” and get answers from your Slack history.
What Works
The channel and thread summaries are genuinely useful for managing information overload. If you’re in 20+ channels, Slack AI reduces the anxiety of “what did I miss.”
AI search across history is valuable for teams with long Slack histories — finding decisions, context, and previous discussions.
What Doesn’t Work as Well
Generation features are limited. Slack AI is mostly consumption (summarization) not creation. It doesn’t draft Slack messages, suggest responses, or help you communicate better.
No meeting intelligence. Slack doesn’t do meeting transcription or in-meeting AI. That’s handled by separate tools.
Pricing feels steep. $10/user/month for essentially summaries and search. For smaller teams, the ROI math is harder.
Microsoft Teams AI (Copilot)
Part of Microsoft 365 Copilot, Teams AI covers meeting intelligence, chat summaries, and integration with the broader M365 context.
Meeting Intelligence
The strongest feature of Teams Copilot:
- Real-time transcription and summarization during meetings
- “Catch me up” for late joiners
- Post-meeting summary with action items, decisions, and owners
- Meeting transcript searchable after the fact
For knowledge workers in 3-5 meetings per day, the post-meeting summary alone saves 30-45 minutes daily of note-taking and synthesis.
Chat Intelligence
Teams Copilot summarizes long threads and conversations, similar to Slack AI. The underlying quality is comparable.
M365 Cross-Context
Teams Copilot knows your broader M365 context: emails you’ve received, documents you’ve worked on, calendar context. A meeting summary can reference the relevant Word document or the email thread that preceded the meeting.
This cross-app context is powerful and Slack can’t match it.
Limitations
Expensive. $30/user/month on top of existing M365 licensing. For small teams, this is significant.
Requires M365. If your organization doesn’t use M365, Teams AI isn’t relevant.
Can feel like information overload. With summaries from every meeting and every channel, some users report feeling more overwhelmed, not less.
Feature Comparison
| Feature | Slack AI | Teams Copilot |
|---|---|---|
| Channel/chat summaries | ★★★★★ | ★★★★☆ |
| Meeting intelligence | ✗ | ★★★★★ |
| M365 cross-context | ✗ | ★★★★★ |
| Message drafting | Limited | ★★★☆☆ |
| Search intelligence | ★★★★☆ | ★★★★☆ |
| Price | $10/user/mo add-on | $30/user/mo add-on |
| Required platform | Slack | Microsoft 365 |
Decision Guide
Use Slack AI if:
- Your team is on Slack and won’t switch
- Channel/thread summaries address your main pain point
- You’re not a Microsoft 365 shop
Use Teams AI if:
- You’re already in the Microsoft ecosystem
- Meeting intelligence is valuable (multiple meetings per day)
- You want AI that understands context across emails, docs, and meetings
Consider neither if:
- Your team communication is manageable without AI summaries
- Budget is tight and ROI is uncertain
- Your primary AI use cases are writing and analysis (use Claude directly)
Alternative: Just Use Better Async Culture
Both tools are solving information overload problems. Before paying $10-30/user/month, consider: better async communication practices (fewer, shorter channels; good thread hygiene; written summaries from meeting owners) often achieve the same result without the AI tax.
The AI is a supplement to good practices, not a substitute for them.