Dots vs Muse vs Grok Bot vs Gemini Spark: Best Always-On AI Agent in 2026

Between May and September 2026, four companies shipped always-on AI agents: AI that runs on its own cloud computer and keeps working when you close the app. OpenAI Dots is the best fit for work that lives in ChatGPT, Slack and Teams, and the only one with role-specific "specialist" agents for companies. Meta Muse has the most careful consumer safety design, a separate Sentinel agent that approves every action, and a free tier. xAI Grok Bot is the most hands-on: you teach it skills by recording your screen and it runs them as routines, but all bots on an account share one computer. Google Gemini Spark is the natural choice if your life runs on Gmail, Docs and Sheets. Product facts below were re-checked against the cited sources on October 11, 2026, and this market changes fast.

An always-on AI agent is an AI assistant with its own persistent computer in the cloud, usually a virtual machine with a browser, files and memory. It pursues goals you give it over hours or days, acts in other apps on your behalf, and pauses to ask for approval before risky steps. The difference from a chatbot is that the work continues when you are not in the conversation.

All four products share that shape. They differ in four places that matter more than any benchmark: how isolated the agent's computer is, how approvals work, which apps it can reach, and who controls the agent's identity.

Dots run on GPT-6 Astra, each with its own cloud computer and browser, and connect to more than 4,000 apps through ChatGPT plugins. You can reach your Dot from ChatGPT, Slack or Teams. While you are away, a Dot does read-only "proactive research" and brings back drafts for approval.

The standout for companies is specialist Dots: agents provisioned with their own identities, credentials and tools for one job such as procurement, invoicing or customer support. OpenAI says it is integrating with Microsoft's Agent 365 security controls. That is the right design. An agent with its own identity can be audited and revoked without touching a human's account.

Read the full guide: What are OpenAI Dots?

Muse runs every user's agent inside an isolated Muse Secure VM. The interesting part is the Sentinel agent, a second agent whose only job is to approve or block anything Muse tries to do on the internet. Muse never sees your passwords or payment methods; purchases go through Stripe's Link. Meta says a Muse Confidential VM with end-to-end encryption, where only the user holds the key, is coming.

The guard-agent pattern is worth copying in your own systems, and we show how in Meta Muse explained.

Grok Bot treats agents as teammates you message. Its most useful feature is teach by demonstration: record yourself doing a task for about ten minutes, and Grok Bot saves it as a skill that can run on a schedule or a trigger as a routine. Bots can also message each other in group threads and hand work off.

The catch is isolation. According to xAI's documentation, all bots on one account share a single persistent VM. Each bot gets its own screen, but files, browser sessions and command-line credentials are shared across the whole roster. Do not give one bot access to something you would not give all of them. Details in What is Grok Bot?

Gemini Spark was announced at Google I/O 2026 and began rolling out in beta to US Google AI Ultra subscribers in late May, according to The Next Web. It gets a dedicated Gmail address you can email tasks to, browses through Chrome, pulls context from Google Workspace apps and, according to a September 2026 industry newsletter, asks before sending email or spending money. Google has widened availability since launch, so check its current plans and regions. If your work already lives in Workspace, it has the least integration friction of the four.

Anthropic folded Claude's Cowork agent into the main Claude app from September 16, 2026, with admin tool permissions and SIEM activity streaming among its controls. Microsoft's Copilot Autopilot is in private preview inside Microsoft 365 tenants. Both are aimed at knowledge work inside an organisation rather than personal errands, and both are worth evaluating if you are choosing an enterprise standard.

The feature lists will converge. The question that will not is who the agent answers to. Before you hand any of these products real access, check four things: can you see a complete log of what it did, can you export or delete its memory, can you revoke its access in one place, and does it use its own identity or yours? Those answers decide whether an always-on agent is an assistant or a liability. Our agent identity guide and approval design guide go deeper.

What is the best always-on AI agent in 2026? There is no single best. OpenAI Dots fits teams working in ChatGPT, Slack and Teams; Meta Muse has the strongest consumer safety design and a free tier; xAI Grok Bot is best for teaching repeatable browser workflows; Google Gemini Spark fits Google Workspace users.

Which always-on AI agent is free? Meta Muse has a free tier. OpenAI Dots needs ChatGPT Pro or Business Premium, Grok Bot needs a paid Cursor or SuperGrok plan starting at $20 a month, and Gemini Spark launched on Google AI Ultra, so check Google's current plans.

What is the difference between Dots and Muse? Dots is aimed at work: it connects to 4,000+ apps and lives in ChatGPT, Slack and Teams, with specialist Dots for business roles. Muse is aimed at personal tasks and uses a separate Sentinel agent to approve every internet-bound action. Both run on their own cloud computers.

Are always-on AI agents safe? They are as safe as their isolation, approvals and identity design. Prefer agents that use their own identity rather than your password, show a full action log, ask before irreversible actions and let you revoke access in one place.

Can I build my own always-on AI agent? Yes. You need a scheduler, a sandboxed computer, tools (usually through MCP), a memory store, an approval gate and an audit log. Our build guide walks through the architecture.

Do Grok Bots share a computer? According to xAI's documentation, all bots on one account share a single persistent VM. Each bot gets its own screen, but files, browser sessions and command-line credentials are shared across the roster.

Is Gemini Spark available outside the US? It began rolling out to US Google AI Ultra subscribers in late May 2026, so the US came first, and Google has widened availability since. Check Google's current availability for your country before planning around it. Are Claude and Microsoft Copilot also always-on agents? Both are moving that way. Anthropic folded Claude's Cowork agent into the main Claude app in September 2026, and Microsoft's Copilot Autopilot is in private preview inside Microsoft 365 tenants. Both target knowledge work inside an organisation.

• What are OpenAI Dots?
• Meta Muse explained
• What is Grok Bot?
• Build your own 24/7 personal AI agent
• Agentic AI Engineer roadmap

• OpenAI launches dots, always-on AI agents with their own cloud computers (The Next Web, Sep 29, 2026)
• OpenAI launches Dots (TechCrunch, Sep 29, 2026)
• Introducing Muse (Meta, Sep 8, 2026)
• Grok Bot: xAI's AI teammates get their own computer (Digital Applied)
• Grok Bot access expanded to Cursor Pro
• Gemini Spark, a 24/7 agentic assistant (The Next Web)
• The Personal Agent Landscape, September 2026