--- original_url: "https://jace.pro/blog/comparing-ai-harnesses-opencode-ollama-lm-studio-claude-code-open-webui-and-vs-code/" format: markdown ai_optimized: true --- Comparing AI Harnesses: OpenCode, Ollama, LM Studio, Claude Code, Open WebUI, and VS Code# Comparing AI Harnesses: OpenCode, Ollama, LM Studio, Claude Code, Open WebUI, and VS Code March 29, 2026 [ai ](/tags/ai/)[tools](/tags/tools/) Enable AI AnimationEvery week there’s a new AI coding tool. I’ve been testing the ones that actually matter: **OpenCode**, **Ollama**, **LM Studio**, **Claude Code**, **Open WebUI**, and **VS Code with Copilot**. They all take different approaches and honestly some of them aren’t even the same kind of thing. Let me explain. ## [The quick version](#the-quick-version) Open SourceRuns OfflineHas Agent ToolsCost**[OpenCode](https://opencode.ai/)**Yes (MIT)YesYes, 15 built-inFree**[Ollama](https://ollama.com/)**Yes (MIT)YesNoFree**[LM Studio](https://lmstudio.com/)**NoYesNoFreemium**[Claude Code](https://claude.com/product/claude-code)**NoNoYes$20/mo**[Open WebUI](https://docs.openwebui.com/)**Yes (MIT)YesVia Python functionsFree**[VS Code (Copilot)](http://github.com/features/copilot/plans)**NoNoLimited$0-40/mo## [OpenCode](#opencode) This is what I use most. It’s a terminal-based coding agent with 15 built-in tools — bash, file read/write/edit, grep, glob, web fetch, web search, task tracking, the works. It has MCP support (local, remote, OAuth), a skills system using `SKILL.md` files, and connects to 75+ model providers or local models through Ollama/LM Studio. This also has a desktop and web interface, but I prefer the terminal. It’s the most powerful and flexible coding agent I’ve found. MIT licensed. No vendor lock-in. ## [Ollama](#ollama) Ollama is not a harness. It’s a model runner. It downloads models, runs them locally with GPU acceleration, and exposes an OpenAI-compatible API. That’s it. No file operations, no code editing, no tools, no agent anything. But it’s the engine underneath a lot of other tools. OpenCode uses it. Open WebUI uses it. Think of it as the foundation, not the car. ## [LM Studio](#lm-studio) Similar to Ollama but with a nice desktop GUI and a killer feature: headless mode. You can deploy `llmster` on a server and use it as a model inference backend without any GUI. It has TypeScript and Python SDKs and OpenAI-compatible APIs. No built-in agent tools though. It’s for running models, not for coding with them. ## [Claude Code](#claude-code) Anthropic’s official coding agent. The most polished experience I’ve used. Terminal CLI, VS Code extension, JetBrains plugin, desktop app, web interface, even an iOS app. Full set of coding tools — bash, file operations, git integration, web search, multi-agent support. Uses `CLAUDE.md` files for skills and has auto-memory that persists across sessions. The catch: $20/month, Claude models only, no local models, cloud required. ## [Open WebUI](#open-webui) A self-hosted web chat interface. Not really a coding agent — it’s a general purpose AI interface. Connects to Ollama, OpenAI, Anthropic, whatever. Has RAG, image generation, voice I/O. You can write Python functions that become tools, and the community shares them. Good if you want a centralized AI chat hub for a team. Not built for coding workflows. ## [VS Code with Copilot](#vs-code-with-copilot) The IDE-native approach. Inline completions, chat, terminal integration, LSP integration (best in class). Has MCP support with sandboxing, which is unique — you can restrict filesystem and network access for MCP servers. Less powerful than a dedicated agent but it’s right there in your editor. Skills via `.prompt.md` files. ## [What I actually use](#what-i-actually-use) I OpenCode as my primary coding agent, and Open Web UI when I need to work from my phone or want the polished multi-surface experience. Ollama is how I started and run if i need something local quick I stick to the command line. I moved to llamacpp for local models because it was faster to set up and has better performance on my hardware. Most of these work together. That’s the point — pick the ones that fit how you work. ## [Detailed comparison](#detailed-comparison) If you want the full feature-by-feature breakdown, here it is. ### [Interface types](#interface-types) OpenCodeOllamaLM StudioClaude CodeOpen WebUIVS Code**Desktop App**✅✅✅✅❌❌**CLI / TUI**✅✅✅ (`lms`)✅❌❌**IDE Extension**✅ VS Code❌❌✅ VS Code, JetBrains❌✅ Native**Web Interface**✅✅❌✅✅❌**Terminal**✅✅✅✅❌⚠️ Integrated### [Core capabilities](#core-capabilities) OpenCodeOllamaLM StudioClaude CodeOpen WebUIVS Code**Tools Support**✅ Native❌⚠️ Via MCP✅ Native✅ Python Functions✅ Native**Skills Support**✅ (`SKILL.md`)❌❌✅ (`CLAUDE.md`)❌✅ (Prompt Files)**MCP Servers**✅ Local + Remote + OAuth⚠️ API only✅ Via API✅ Full support✅ Supported✅ With sandboxing**LSP Integration**✅ Experimental❌❌❌❌✅ Native**Git Integration**⚠️ Via bash❌❌✅ Native❌✅ Native### [Built-in tools](#built-in-tools) OpenCodeOllamaLM StudioClaude CodeOpen WebUIVS Code**Shell execution**✅❌❌✅⚠️ Via functions⚠️ Via extensions**File read**✅❌❌✅❌⚠️ Via context**File edit/write**✅❌❌✅❌❌**Grep search**✅❌❌✅❌❌**Glob file finding**✅❌❌✅❌❌**Web search**✅ (Exa AI)❌❌✅⚠️ Via tools⚠️ Via extensions**Web fetch**✅❌❌✅⚠️ Via tools❌**Task tracking**✅❌❌❌❌❌**Multi-agent**✅❌❌✅❌❌### [Model support](#model-support) OpenCodeOllamaLM StudioClaude CodeOpen WebUIVS Code**Local Models**✅ Via Ollama/LM Studio✅ Native✅ Native❌✅ Via Ollama⚠️ Limited**Cloud APIs**✅ 75+ providers⚠️ Via proxy✅✅ Claude only✅ Multiple✅ GitHub/OpenAI**Bring Your Own Key**✅✅✅❌✅⚠️ Limited**Model Management**⚠️ Via integration✅ Excellent✅ Excellent❌⚠️ Via Ollama❌ --- [View this page on GitHub](https://github.com/jacebenson/jace.pro/tree/main/./src/posts/2026/2026-03-29-ai-harness-comparison.md). [Comparing AI Harnesses: OpenCode, Ollama, LM Studio, Claude Code, Open WebUI, and VS Code](https://jace.pro/blog/comparing-ai-harnesses-opencode-ollama-lm-studio-claude-code-open-webui-and-vs-code/) [Jace Benson](https://jace.pro) ![Jace Benson](https://jace.pro/icon-512x512.png) --- *This content is from Jace Benson's ServiceNow and tech blog at jace.pro* *Original post: https://jace.pro/blog/comparing-ai-harnesses-opencode-ollama-lm-studio-claude-code-open-webui-and-vs-code/*