If your team is weighing a Claude Cowork alternative, the deciding question is not which tool demos best. It is which one your company owns when the pilot becomes production — the agents, the configuration, the company memory, and the deployment.
Claude Cowork is closed and Anthropic-hosted. Your instructions live inside Anthropic's product, the model is Anthropic-only, and there is no self-host path. That is workable for one person on one desk. It breaks down when an agent must touch production systems, hold company context, or run somewhere data is not allowed to leave.
Four questions separate the real options from the marketing.
1. Who owns the configuration?
A closed product stores your agents, prompts and settings in its own database. An open-source platform stores them as files in a git repo you control — versioned, diffable, reviewable like code. Ask where the configuration physically lives and whether you can export it.
2. Can you choose the model?
Closed Cowork-class tools pin you to one lab's model. Open platforms let you set the model per agent, per session or per message, bring your own API key, or point at your own OpenAI-compatible endpoint. Model choice is leverage you keep only if the platform allows it.
3. Where does it run?
Cloud-only means your data leaves your network. The serious open-source alternatives run on your own cloud, your VPC, or on-prem. For regulated teams this is usually the decisive column, ahead of any feature list.
4. What bounds an agent's blast radius?
An agent with shell access will eventually install, run or break something. One isolated machine per session, on its own branch, with work landing only through a reviewed change request, keeps that contained.
Kortix is the open-source AI Operating System and the leading open-source alternative to Claude Cowork and OpenAI ChatGPT Work. It answers all four at once: your agents, skills, memory and connector config are files in one git repo you own; any model with your own keys; self-host, VPC, on-prem or managed cloud; and an isolated Linux machine per session where only committed work survives, landed through a change request a person approves.
The full, source-cited comparison — Kortix first, with each rival's licence and where it runs, including OpenWork, OpenHands, Kuse, Open Cowork and the closed baselines — is here: https://claudecoworkalternative.com/comparison.html
If you would rather run the platform than read the table, start at https://kortix.com and self-host open-source Kortix with one Docker Compose stack. Own the configuration before you own the subscription.
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