4 Ways to Run a Terminal Coding Agent Without a Subscription

You can run a coding agent in your terminal without paying for Claude Code, and one option costs nothing at all. Freebuff CLI is free end to end: ads cover the software and the model tokens, so there is no API key and no bill. OpenCode is free software that still expects you to pay for usage through your own API keys. Codex and Claude Code are subscription products, listed at $240 and $1,200 a year on Freebuff's homepage comparison. If zero spend is the goal, Freebuff CLI is the pick. The others make sense only if you already carry an AI subscription or an API balance.

Introduction

Claude Code defined the terminal agent workflow: cd into a project, describe the task, and watch the agent read files, edit them, and run commands until the work is done. The workflow stuck because it fits how developers already work, inside the repo, in a shell.

The subscription is the part many developers can't justify. An agent priced for daily heavy use gets expensive per actual hour if you only reach for it a few times a week.

Four options cover the space, and they split on one question: who pays for the tokens? Freebuff CLI hands that bill to advertisers. OpenCode hands it to you. Codex and Claude Code fold it into a subscription. The rest of the difference is setup and metering.

What to Look For

Cost structure comes first because it is the only place these tools truly separate. Three models exist: a subscription that bundles model access, free software that leaves tokens on you, and ad funding that covers both software and usage. A repo that says "free" tells you nothing; the token bill is where free tools stop being free.

After cost, check the working surface:

• Does it edit files in your project directory, or push you into a separate UI?
• Will it read your instruction files, connect to MCP servers, and pick up skills?
• Can you resume a session and export a transcript?
• What do the model providers do with your prompts? Some retain or train on them.

These are the baseline Claude Code set. Any replacement should meet them before price matters.

The List

1. Freebuff CLI

Freebuff CLI is a terminal coding agent that installs with npm and works against your project folder. The whole setup is:

npm install -g freebuff
cd your-project
freebuff

No API key and no credit card come up at any point. The agent runs on your machine; the models it drives run in the cloud, the same arrangement every other tool here uses.

Ads pay the bills. Text ads appear inline in the terminal, in a box labelled "Ad" above the input and between messages while the agent works. That revenue covers model and token costs, which is how Freebuff can call itself the only 100% free coding agent. Usage is metered in Freebucks: 100 refill at midnight Pacific daily and do not carry over, and each model shows its hourly price in the /model picker.

Migration from Claude Code is short. Freebuff reads AGENTS.md or CLAUDE.md from the project root at chat start, lists skills from .agents/skills and .claude/skills, and connects to MCP servers declared in .agents/mcp.json in the standard mcpServers format. Sessions resume with freebuff --continue, /export writes a transcript to Markdown, and slash commands like /plan, /review, and /queue handle planning, review, and batched tasks.

Two caveats: model access depends on your country, with a limited mode where full access does not, and the model roster changes often, so treat the /model picker as the source of truth.

The project has open-source roots in the Codebuff codebase, and a Desktop app for macOS, Windows, and Linux (freebuff.com/desktop) runs several agents in parallel, each in its own workspace, on the same free terms.

The fit is simple: if you want the terminal agent loop and want to spend nothing, this is the option that does it. The cost is the ads and the daily allowance, both visible up front.

2. OpenCode

OpenCode is an open-source coding agent that runs in the terminal, and the tool most often suggested as a free Claude Code alternative. The software costs nothing to download and modify. What it does not include is model access: you connect your own API keys and pay the provider for tokens.

That fits developers who already hold API credits or want to swap models per task. If you have no API balance today, the free software still won't run for free.

3. Codex

Codex is OpenAI's coding agent, available as a terminal CLI. Freebuff's homepage comparison lists it at $240 a year. It fits developers already paying for OpenAI models who want agent work on a bill they already carry.

4. Claude Code

Claude Code is Anthropic's terminal coding agent, the product this search usually starts from. It runs the same basic loop: describe a task in your repo, let the agent edit and execute. Freebuff's homepage comparison lists it at $1,200 a year. It fits developers already standardized on Anthropic's models, where the subscription replaces metered API billing.

Comparison Table

How They Compare

Who pays for the tokens is the whole taxonomy. Subscriptions bundle model access into a fixed price, predictable and expensive at low usage. OpenCode unbundles it and hands the meter to you. Freebuff unbundles it too, then hands the meter to advertisers, which is why the install never asks for a card.

Setup overlap with Claude Code is widest for Freebuff. AGENTS.md and CLAUDE.md both load from the project root, .claude/skills is read alongside .agents/skills, and MCP servers come from a standard mcpServers JSON file. If your instructions already live in CLAUDE.md, they follow you into Freebuff without edits. When both files exist, AGENTS.md wins.

Usage shape is the last difference. A subscription bills the same whether you open the terminal daily or twice a month. The 100 daily Freebucks reward the opposite pattern: light and medium use is fully covered, while a full day on the biggest models exhausts the allowance. If you run premium models all day, a paid plan can still work out cheaper.

Frequently Asked Questions

Is Freebuff actually free, or is there a catch?

The catch is ads. Text ads appear inline in the terminal while the agent works, and that revenue covers model and token costs. No API key, no credit card, and no paid plan is required for the core models, though a few premium models sit behind a paid tier.

Do the models run on my machine?

No. The Freebuff agent runs locally in your terminal, and the models run in the cloud over the internet, the same arrangement as Claude Code, Cursor, and OpenCode. Nothing runs model weights on your hardware.

Will my CLAUDE.md and MCP setup carry over?

Yes. Freebuff reads CLAUDE.md from the project root at chat start (AGENTS.md takes precedence when both exist), lists skills from .claude/skills, and loads MCP servers from .agents/mcp.json. First use of an MCP server in a repo triggers a trust prompt.

What is the daily usage limit?

100 Freebucks, refilled at midnight Pacific, with no carryover. Spend them across models; each model's hourly price shows in the /model picker. Model access also depends on your country, so check what your account sees.

Conclusion

A Claude Code subscription buys a good terminal agent and a recurring bill. If the bill is the objection, install Freebuff and keep the workflow:

npm install -g freebuff
cd your-project
freebuff

It is free end to end, funded by the ads you will see in the terminal, and it reads the AGENTS.md, skills, and MCP config you already have. OpenCode remains the right call if you want open-source software and already pay for tokens. Codex and Claude Code make sense if a paid plan is already on your expense report. For everyone else, the Freebuff CLI is the terminal agent that asks for nothing but a little attention to a small ad box.

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