LUMI
LUMI: A free, open-source VS Code agent extension with approval-gated edits and no inline completion. Ranked #39 of 43 in AI Coding Assistant Extensions for VS Code by our editors (5.2/10); pricing: Free plan; best for solo developers seeking a free, self-hosted agent extension.
At a glance
- Editor score5.2 / 10
- PricingFree plan
- Best forSolo developers seeking a free, self-hosted agent extension
- Free planYes
- Paid fromNone
- Codebase contextYes
- Facts checked3 Oct 2026
Where it wins
- Reads workspace files and accepts rich context such as diffs and terminal output
- Approval-gated file edits and terminal commands, with checkpoints for rollback
- Connects multiple model providers and supports governed parallel subagents
Where it doesn't
- No inline code completion
- Community support only
- Agent workflow requires approval for mutating actions
Our verdict on LUMI
LUMI is an open-source AI coding assistant extension for developers who want an agent to work with project context inside VS Code. It reads workspace files and offers Plan and Act modes for planning changes, editing files, and running terminal commands. Its approval gates keep mutating actions under developer control. The product is also listed for Cursor, and its supported platforms include Windows, macOS, and Linux. It is aimed at solo and small-team use, particularly for developers comfortable directing an agent through chat rather than relying on inline code completion.
Context handling is a notable strength: chats can include files, folders, problems, terminal output, git diffs, and URLs, and LUMI supports MCP server connections. Checkpoints allow rollback after tool execution, while local task history and cognitive memory support continuity across work. Governed parallel subagent execution adds a way to split work across agents. These features suit repository-level tasks where the developer wants to provide relevant material and review proposed actions. Developers looking primarily for inline suggestions as they type should choose an extension with that capability instead.
LUMI is free and open source, with model connections including OpenRouter, ChatGPT Subscription, NousResearch, Cloudflare Workers AI, Cerebras, ClinePass, Grok/X Subscription, Qwen Token Plan, and Z AI. That range gives developers options for connecting models, alongside MCP servers, but the agent workflow still depends on selecting and connecting a provider. The published product details do not establish a paid-plan comparison; the listed support channel is community. LUMI is a good fit for solo developers who value configurable, approval-based agent work and can rely on community support. Teams that need inline completion or a formal support channel should look elsewhere.
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LUMI pricing
LUMI fact sheet
| Free plan | Yes |
|---|---|
| Paid from | None |
| Codebase context | Yes |
| Inline completions | No |
| Model choice | Multiple |
| Editor chat | Yes |
| Supported platforms | VS Code; Cursor (extension support) |
| Free AI requests | Not verified |
| Deployment | Self-hosted, Browser extension |
| Platforms | Windows, macOS, Linux |
| Support | Community |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 10 integrations: OpenRouter, ChatGPT Subscription, NousResearch, Cloudflare Workers AI, Cerebras, ClinePass … |
| Pricing | Free plan |
| Website | dietcode.io |
| Facts checked | 3 Oct 2026 |
LUMI integrations
LUMI lists 10 integrations on its own site.
- OpenRouter
- ChatGPT Subscription
- NousResearch
- Cloudflare Workers AI
- Cerebras
- ClinePass
- Grok/X Subscription
- Qwen Token Plan
- Z AI
- MCP servers
Alternatives to LUMI
- Baidu ComateA broad IDE assistant spanning completions, agents, testing and multi-file edits.9.3
- Tongyi LingmaA broad coding toolkit for developers who want project-aware assistance and agent tasks.9.2
- Tencent CodeBuddyA cross-IDE coding assistant combining project-aware completion, chat, and coding agents.9.1
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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