Microsoft Copilot vs Slack AI: pricing, features and which to choose

Microsoft Copilot is a general-purpose AI assistant available on the web, mobile devices, Windows, macOS, Edge, and dedicated applications. Its consumer experience supports questions, brainstorming, writing, coding, image creation, voice, vision, podcasts, and research, with limits that depend on plan, region, and capacity. Microsoft 365 subscriptions add Copilot to Word, Excel, PowerPoint, Outlook, OneNote, Teams, and related services, alongside cloud storage and security benefits. Business and enterprise offerings connect chat and agents to permitted organizational files, meetings, email, and other work data. Copilot is therefore a family of connected experiences rather than one uniform feature set. Access, limits, supported languages, and availability vary across accounts and devices, so Microsoft 365 users seeking in-app assistance should choose it.

Microsoft launched Copilot as a successor to Bing Chat in 2023 and expanded it through Microsoft 365, Windows, Edge, and dedicated applications. Microsoft introduced Copilot Pro for consumers before replacing that standalone subscription with Microsoft 365 Premium in October 2025. The company describes Microsoft 365 Premium as a bundle combining Microsoft 365 Family benefits with advanced Copilot capabilities and higher usage allowances. Microsoft is the product maker and does not publish a conventional venture funding history for Copilot as a standalone company because Copilot is a Microsoft product. Its development draws on Microsoft's broader AI investments, partnerships, cloud infrastructure, and product teams. Current company documentation describe ongoing expansion across individual, business, enterprise, and agent-building offerings.

Copilot's main limitation is fragmentation: names, prices, capabilities, model access, data boundaries, and usage limits differ among consumer, business, enterprise, and Studio products. Personal and Family Copilot benefits are limited to the subscription owner, while shared family members receive Microsoft 365 services without the owner's AI access. The free tier has capacity and usage limits, and some Premium capabilities remain limited or region-dependent. ChatGPT is a closer general-purpose alternative for standalone AI work, Google Gemini is a closer choice for Google Workspace users, and Claude is a strong writing and analysis alternative. Microsoft 365 users should choose Copilot for in-app workflow integration and governed work data; others should compare limits and total subscription value before committing.

Slack AI is the AI layer inside Slack, made by Slack, which Salesforce acquired on July 21, 2021. Slack launched Slack AI on February 14, 2024, initially with AI search, channel recaps, and thread summaries. It now works across conversations, files, huddles, canvases, and Workflow Builder, adding daily recaps, file summaries, translations, AI writing assistance, workflow generation, and Slackbot. The product uses off-the-shelf models and retrieval rather than one publicly identified foundation model. Slack says customer data is not used to train large language models, and responses respect each user’s existing permissions. Slack’s pricing page lists a free plan with 90 days of history, up to 10 apps, and basic AI, while Pro starts at $8.75 per user monthly, Business+ at $18, and Enterprise+ is custom. Salesforce owns the parent company, not Slack AI as a separate acquisition.

Slack AI works inside the places teams already use: search, channels, threads, huddles, canvases, and Workflow Builder. A typical workflow starts with a natural-language question about messages or shared files, followed by an answer grounded in content the requester can access. Users can summarize a thread or channel, capture huddle transcripts and action items, review daily recaps, summarize files, translate messages, or ask Slackbot about conversations, files, and projects. Slack AI can also generate workflows from a prompt and add AI steps, such as recurring channel summaries. Its app directory lists more than 2,600 integrations, while enterprise search extends queries across connected apps and systems. Slack says outputs remain permission-scoped, so the assistant should not expose content unavailable to the requesting user.

Slack AI’s main limitation is scope: it is strongest inside Slack, where permission-scoped search, summaries, recaps, file summaries, translations, Slackbot, and Workflow Builder draw on conversations and shared files. Microsoft 365 Copilot reaches across Teams and Microsoft 365 apps, while Google Gemini for Workspace is more deeply tied to Gmail, Docs, and Meet. ChatGPT Enterprise is broader as a general assistant, rather than a communication archive with native channels and huddles. Slack says it uses off-the-shelf models, does not train them on customer data, and keeps prompts and outputs from providers, but it does not identify one exclusive foundation model. Its discontinued standalone AI add-on and tier-based feature split also complicate purchasing. Slack AI suits teams already conducting substantial, searchable work in Slack, especially those that value permission-aware retrieval over a general-purpose chatbot.