Cline vs OpenCode (2026): IDE Sidebar or Terminal Agent?
Updated April 29, 2026
How they actually differ
Cline and OpenCode are both autonomous open-source coding agents. The functional gap is smaller than between Cline and Continue, so the choice usually comes down to surface (editor vs terminal) and project velocity.
Cline is the older project and the one with the larger install base (~5M VS Code installs). It lives in your editor sidebar with rich UI for diffs, file ops, terminal access, and approval flows. Strong fit when you want the agent to be a visible passenger in your IDE: you see what it is doing, you click to approve risky steps, you watch the diffs land in real time. The IDE surface is the strength and limit. Outside VS Code you are not getting Cline.
OpenCode is terminal-first, from Anomaly. No editor plugin. You run it from the command line, it operates on the repo in front of you. The same autonomous behavior (reads files, writes files, runs commands) without the IDE overlay. If your workflow lives in the terminal, OpenCode is closer to how you already work. It is also easier to embed in automation, run over SSH, or invoke from CI than an editor-bound agent.
Where the trade-off bites: Cline is the right pick if you want maximum visibility while the agent runs and you want approval gates on every meaningful step. OpenCode is the right pick if you prefer to invoke an agent like a CLI tool and review the resulting diff after, or if you want the same agent available across editors and remote sessions.
Both work with Respan. OpenCode has first-party Respan tracing as part of the trace CLI coding agents cookbook. Cline routes cleanly through the Respan gateway when you want unified provider keys, cost tracking, and switching across Claude, GPT-5, and self-hosted models. See the proxy coding agents cookbook for the gateway setup.
Overview
Cline is the OG open-source autonomous coding agent for VS Code with 5M+ installs. It creates and edits files, runs terminal commands, controls the browser, and supports MCP — all step-by-step with your permission. Free OSS extension; pay only for AI inference. Teams plan: $20/user/mo (first 10 seats free).
OpenCode is an open-source AI coding agent for the terminal, IDE, and desktop with 75+ LLM providers. Compare its Zen and Go pricing, pros, and cons.
Key features
Core capabilities each platform advertises.
- Step-by-step permission gating for every file edit, command, and browser action
- Model Context Protocol (MCP) support for agent-extensible tools
- Works with any LLM — Claude, OpenAI, Google, local
- Browser control and full terminal integration
- Most-installed open-source coding agent on VS Code (5M+)
- Terminal UI, desktop app, and IDE extensions
- 75+ LLM providers via Models.dev, including local models
- Sign in with GitHub Copilot or ChatGPT Plus/Pro
- LSP-enabled code understanding
- Multi-session agents on the same project
Strengths and tradeoffs
What each tool does well, and the limitations to keep in mind.
Pros
- OG agentic coding agent — battle-tested with 5M+ installs
- Step-by-step permissions keep humans in the loop
- Pairs especially well with Claude Sonnet's tool use
- Open-source under MIT — no lock-in
- Strong community + active fork ecosystem (Kilo, Roo)
Cons
- VS Code only (JetBrains arrives with Teams plan)
- Pay-per-token costs add up for heavy agentic workloads
- Newer forks (Kilo, Roo) ship features faster
- Permission prompting can feel slow on long tasks
Pros
- Free and open source under MIT
- Doesn't store code or context data
- 75+ providers, including local models and existing Copilot or ChatGPT subscriptions
- Same agent across terminal, desktop, and five IDEs
Cons
- Zen data retention varies by provider, and OpenAI keeps requests for 30 days
- Zen credit purchases carry card fees of 4.4% + $0.30
- Go plans cap usage in 5-hour, weekly, and monthly windows
What people are saying
It's like having a senior dev who actually reads and understands your entire codebase before making suggestions.
Read full reviewIt was the first time I felt like I could write up a large prompt, walk away from my laptop, and come back to a lot of work having been done.
Read full reviewCline or OpenCode — which should you choose?
Choose Cline if you wantChoose if you want
- Autonomous multi-file feature implementation in VS Code
- Agent-driven refactors with reviewable per-step permission
- Terminal automation under agent control
- BYO model coding workflows (Claude, GPT, local)
- Browser-based testing and debugging from the agent
Choose OpenCode if you wantChoose if you want
- Terminal-first AI pair programming
- Privacy-sensitive environments using local models
- Parallel agent sessions on one codebase
- BYOK across providers without switching tools
Both let you pick the model. Respan shows you what you're spending.
Pay-per-token adds up fast on agentic workloads. Respan's LLM gateway puts every major provider behind one API, sets hard spend limits that block a runaway key, and fails over automatically when a provider rate-limits.
Try Respan free