Cline vs Aider vs OpenCode vs OpenClaw: Which Open-Source AI Agent Should You Use in 2026?
Short answer: use Cline if you work in VS Code and want to approve every change, Aider if you want careful edits in the terminal with every change saved as a git commit, OpenCode if you want a fast terminal agent that plans and builds on its own, and OpenClaw if you want a personal assistant that lives in WhatsApp or Telegram rather than in your editor.
All four are open source and none of them sells you the AI model. You bring your own API key. That is the part most comparisons skip, and it is where most of your cost and setup pain comes from. This guide compares the four agents honestly, shows what each one is actually good at, and shows how to run all of them on a single Velona key billed in rupees.
Cline vs Aider vs OpenCode vs OpenClaw at a glance
| Cline | Aider | OpenCode | OpenClaw | |
|---|---|---|---|---|
| What it is | Coding agent inside your editor | Terminal pair programmer | Terminal coding agent | Personal AI agent |
| Where you use it | VS Code, JetBrains and VS Code forks | Terminal | Terminal (TUI), plus an editor extension | WhatsApp, Telegram, Slack, Discord and more |
| Best at | Multi-file features with a human checking each step | Precise edits to existing code, clean git history | Longer tasks it can plan and carry out by itself | Everyday tasks, reminders, research, automation |
| How much it does alone | Asks before each edit or command, unless you allow more | Edits the files you add, you stay in control | Works through steps with fewer stops | Runs in the background, can act without being asked |
| Git workflow | Checkpoints you can roll back | Auto commit for every change | Undo and sessions inside the tool | Not a coding tool |
| Licence | Apache 2.0 | Apache 2.0 | MIT | Open source |
| Bring your own key | Yes, OpenAI compatible | Yes, OpenAI compatible | Yes, OpenAI compatible | Yes, OpenAI compatible |
| Good default model on Velona | DeepSeek V4 Flash for Act, a stronger model for Plan | DeepSeek V4 Flash, or Architect mode with two models | DeepSeek V4 Flash | DeepSeek V4 Flash for chat, a stronger model for hard jobs |
Watch: 4 agents, 1 key, billed in rupees
This short video shows the idea behind this guide. Four different agents, one Velona key, one wallet you top up with UPI.
Cline: the careful agent inside VS Code
Cline is an extension for VS Code and JetBrains editors. It reads your project, proposes changes as diffs, runs terminal commands and can open a browser to check its work. By default it asks before every file edit and every command, so you see exactly what it is about to do.
Where Cline is strong
- Plan and Act modes. In Plan mode it talks through the approach without touching files. In Act mode it does the work. You can set a different model for each mode, which is the single best way to save money.
- Checkpoints. Every step is saved, so you can roll back to any point in a task.
- Visibility. You review each diff before it lands. Good for learning a new codebase or working on code that matters.
Where it is weaker
- Approving every step gets slow on long tasks. You can loosen it with auto approve, but then you lose the main benefit.
- It sends a lot of context on each step, so an expensive model gets expensive fast.
Choose Cline if you live in VS Code and want an agent you can watch and steer.
Connect Cline to Velona
- Open Cline settings and choose OpenAI Compatible as the API provider.
- Set the Base URL to
https://velona.in/v1. - Paste your Velona API key.
- Set the Plan mode model to
anthropic/claude-sonnet-5and the Act mode model todeepseek/deepseek-v4-flash.
Aider: git-first pair programming in the terminal
Aider is one of the oldest open-source AI coding tools and still one of the most reliable. You start it in your repo, add the files you want it to work on, and describe the change. It edits those files and commits each change to git with a clear message.
Where Aider is strong
- Every change is a commit. Your history stays clean, and undoing a bad edit is one
git revertor an/undoinside Aider. - Repo map. It builds a compact map of your codebase instead of sending whole files, so each request carries less context. That usually means a lower bill per task.
- Architect mode. One model plans the change and a second, cheaper model writes the edits. Strong reasoning where it counts, cheap tokens for the typing.
Where it is weaker
- It is less autonomous. It works on the files you give it rather than exploring the whole project on its own.
- Terminal only, so it is not for people who never leave the editor.
Choose Aider if you care about precise edits to an existing codebase and want git to be your safety net.
Connect Aider to Velona
Aider talks to any OpenAI-compatible API. Set two environment variables, then add openai/ in front of the model ID.
export OPENAI_API_BASE=https://velona.in/v1
export OPENAI_API_KEY=YOUR_VELONA_API_KEY
aider --model openai/deepseek/deepseek-v4-flashFor Architect mode, plan with a strong model and edit with a cheap one:
aider --architect \
--model openai/anthropic/claude-sonnet-5 \
--editor-model openai/deepseek/deepseek-v4-flashOn Windows, use setx instead of export and open a new terminal.
OpenCode: the fast, autonomous terminal agent
OpenCode is a terminal coding agent with a full-screen interface. It has become one of the most popular open-source coding agents, partly because it works with a very wide range of model providers. It has a planning agent that only reads and suggests, and a build agent that edits files and runs commands, and you can switch between them at any time.
Where OpenCode is strong
- Autonomy. Give it a task and it reads, edits, runs tests and fixes failures with fewer interruptions than Cline.
- Provider freedom. Custom providers are a first-class feature, so adding Velona takes one config block.
- Speed. A keyboard-driven interface that suits people who already work in the terminal.
Where it is weaker
- More autonomy means more steps you did not watch. Commit before a big task so you can reset if needed.
- Long sessions grow the context, and every step resends it. Start fresh sessions for unrelated tasks.
Choose OpenCode if you are comfortable in the terminal and want an agent that gets on with the job.
Connect OpenCode to Velona
Add Velona as a custom provider in your opencode.json:
{
"$schema": "https://opencode.ai/config.json",
"provider": {
"velona": {
"npm": "@ai-sdk/openai-compatible",
"name": "Velona",
"options": {
"baseURL": "https://velona.in/v1"
},
"models": {
"deepseek/deepseek-v4-flash": { "name": "DeepSeek V4 Flash" },
"deepseek/deepseek-v4-pro": { "name": "DeepSeek V4 Pro" },
"anthropic/claude-sonnet-5": { "name": "Claude Sonnet 5" }
}
}
}
}Then add your Velona key with opencode auth login, pick the Velona provider, and choose a model.
OpenClaw: a personal AI agent, not a coding tool
OpenClaw is different from the other three. It is an open-source personal agent that runs on your own machine or server and talks to you through the chat apps you already use, such as WhatsApp, Telegram, Slack and Discord. It keeps a memory between conversations, can run scheduled jobs, and can be extended with community skills.
Where OpenClaw is strong
- It meets you where you are. Ask it something from your phone and it can search, summarise, draft or run a task on your machine.
- Always on. It can check things on a schedule and message you when something needs attention.
- Extensible. Skills add new abilities, from calendars to browsers to your own scripts.
Where you need to be careful
OpenClaw can run shell commands, read and write files, and use your logged-in apps. That power is also the risk. Security researchers have reported exposed OpenClaw instances on the internet and malicious skills in the community skill registry. Before you use it:
- Keep it on the latest version and never expose its gateway to the public internet without authentication.
- Read the code of any skill before you install it, and install only what you need.
- Run it on a separate machine, VM or container rather than your main laptop.
- Give it its own API key with a small budget. If something goes wrong, the damage to your wallet is capped. On Velona you can set a budget on each key.
Choose OpenClaw if you want an assistant for daily tasks and you are willing to set it up carefully.
Connect OpenClaw to Velona
Add Velona as a custom provider in ~/.openclaw/openclaw.json. OpenClaw uses the openai-completions API type for OpenAI-compatible endpoints, and the model is referenced as provider/model-id.
{
"models": {
"mode": "merge",
"providers": {
"velona": {
"baseUrl": "https://velona.in/v1",
"apiKey": "YOUR_VELONA_API_KEY",
"api": "openai-completions",
"models": [
{
"id": "deepseek/deepseek-v4-flash",
"name": "DeepSeek V4 Flash",
"contextWindow": 1000000,
"maxTokens": 8192
}
]
}
}
},
"agents": {
"defaults": {
"model": { "primary": "velona/deepseek/deepseek-v4-flash" },
"models": {
"velona/deepseek/deepseek-v4-flash": { "alias": "flash" }
}
}
}
}Restart the OpenClaw gateway after saving. If you see a "model not allowed" error, check that the entry under agents.defaults.models matches velona/ plus the exact model ID. OpenClaw changes quickly, so check its documentation if a field name has moved.
One key, all four agents
Each agent supports many providers, but signing up with each AI company separately means several accounts, several dollar bills and an international card. With Velona you get:
- One base URL for every agent:
https://velona.in/v1 - 300+ models behind it, so you can try DeepSeek, Claude, GPT, Gemini, Qwen and Kimi without new accounts.
- Rupee pricing and UPI top ups from ₹10. No international card needed.
- A separate key per agent. Create one key for Cline, one for Aider, one for OpenCode and one for OpenClaw, each with its own budget. Your usage page then shows exactly which agent is spending what.
What it costs to run these agents
The agent is free. The model is what you pay for, and coding agents resend your code on every step, so the input price matters most. At Velona's prices on 4 October 2026, one agent step with about 30,000 input tokens and 1,000 output tokens costs:
| Model | Model ID | ₹ per step | ₹ per 25-step task |
|---|---|---|---|
| DeepSeek V4 Flash | deepseek/deepseek-v4-flash | about ₹0.09 | about ₹2.32 |
| DeepSeek V4 Pro | deepseek/deepseek-v4-pro | about ₹0.69 | about ₹17.30 |
| GPT-5 | openai/gpt-5 | about ₹4.92 | about ₹123 |
| Claude Sonnet 5 | anthropic/claude-sonnet-5 | about ₹7.25 | about ₹181 |
Which agent you pick changes how many tokens go in each step. Aider's repo map tends to keep requests small. Cline and OpenCode explore more and send more. OpenClaw's memory and scheduled jobs can use tokens even when you are not chatting. Our guide to the cheapest AI models for coding agents compares 13 models in detail.
The cheapest setup that still handles hard work is the same in every agent: a strong model for planning and a cheap model for doing. Cline's Plan and Act modes and Aider's Architect mode are built for exactly this.
Which one should you pick?
- Student or new to AI coding: start with Cline. Seeing every diff before it lands is the fastest way to learn what the agent is doing.
- Working on a large existing codebase: Aider. Small, reviewed commits keep you in control.
- Shipping side projects fast from the terminal: OpenCode.
- Want an assistant for everything else in your day: OpenClaw, set up on a separate machine with a capped key.
Nothing stops you from using more than one. Many developers use Cline or OpenCode for building and Aider for careful refactors, all on the same Velona wallet. For more tools, see our guide to OpenAI-compatible coding agents.
Frequently asked questions
Is Cline better than Aider?
Neither is better overall. Cline suits developers who work in VS Code and want to approve each step. Aider suits developers who prefer the terminal and want every change saved as a git commit. Both are open source and both work with any OpenAI-compatible API.
Is OpenCode free?
Yes. OpenCode is open source under the MIT licence. You pay only for the AI model you connect, for example about ₹2.32 for a typical 25-step task on DeepSeek V4 Flash through Velona.
Is OpenClaw a coding agent?
Not mainly. OpenClaw is a personal AI agent that you talk to through chat apps like WhatsApp and Telegram. It can run commands and scripts, but it is built for everyday tasks and automation rather than editing code in a repo.
Is OpenClaw safe to use?
It can be, with care. Keep it updated, do not expose it to the internet without authentication, review skills before installing them, run it on a separate machine, and give it its own API key with a small budget.
Can I use one API key for Cline, Aider, OpenCode and OpenClaw?
Yes. All four accept an OpenAI-compatible base URL and key, so a single Velona key works in all of them. We recommend one key per agent, each with its own budget, so you can see and cap what each one spends.
Which model is cheapest for these agents?
DeepSeek V4 Flash is the cheapest model on Velona that still codes well, at about ₹0.09 per agent step. Switch to DeepSeek V4 Pro, GPT-5 or Claude Sonnet 5 only for the hard parts of a task.
Can I pay for these AI models with UPI?
Yes. Velona prices every model in rupees and you top up with UPI, RuPay, a domestic card or net banking, starting from ₹10.
Set up your agents in five minutes
Create a Velona account, add ₹10 with UPI, make one key per agent with a small budget, and point each agent at https://velona.in/v1 with DeepSeek V4 Flash. Run one real task and check the cost on your usage page.