Buyer's guide
What AI agent frameworks cost to start and scale
Most AI agent frameworks are free to start, and the bill arrives with the hosted layer, priced by plan, seat, credits or usage.
Buyer's guide Terminal coding agents
zot, Aider, OpenCode and GitHub Copilot CLI run Claude models from the terminal with a free plan, and add OpenAI models Claude Code lacks.

The top pick is zot, a single binary that reaches 30+ model providers and runs parallel subagents on one repository. Aider comes next for teams whose code must stay in-house, since it can run entirely against self-hosted models with no external API calls.
OpenCode at $10 a month and GitHub Copilot CLI at $10 a month cost less than Claude Code at $20 a month. OpenCode adds single sign-on and admin controls, and GitHub Copilot CLI uses Claude as its default model.
On 27 October 2026 we listed 194 agents: 9 of them under Terminal coding agents, 105 with a free plan and 116 confirmed for Claude. We asked Perplexity for alternatives to 4 of these 5 agents, on 13 October 2026.
Best for forking sessions from any past turn: zot’s fork command starts a new session from any past turn, and its tree view shows every session in the working directory as parents and children, so developers who try several approaches to one task can keep each one.
Price Free
zot is a single Go binary that drives 30+ model providers. Anthropic is a first-class provider, reached with an API key or by logging in with an existing Claude Pro or Max subscription. It runs as an interactive terminal interface, a one-shot print mode, a streamed event feed for tools, or a long-running subprocess you embed in apps written in any language.
There is no account, paid tier or sales contact. A one-line installer fetches the binary, and a local Ollama model gets it running on your own machine. Model usage is billed by whichever provider key or subscription you bring, and transcripts stay local and export to a portable session file.
Swarm runs several agents at once as separate processes, but they share one working directory with no per-agent branch isolation. Large repositories rely on the model’s context window and automatic compaction, because there is no repository index. A Telegram bridge mirrors a session to direct messages or runs the agent as a headless bot you drive remotely.
What it does well
Where it falls short
Best for automatic git commits of every edit: Aider commits every accepted change with a descriptive message, so teams that review AI work in git history see each change as its own commit.
Price Free
Aider is an open-source terminal pair programmer that edits files in your local git repo and commits each accepted change. Aider names Anthropic Claude among the models it works best with, and its quick-start launches it with an Anthropic key. It connects to 14 backends, among them OpenAI, Gemini, DeepSeek, Ollama, OpenRouter, Amazon Bedrock and Vertex AI.
It is Apache 2.0 licensed software you install with pip, with no account, paid plan or sales call. Model usage is billed by the provider whose key you supply, so the real cost varies with use. It can run entirely against self-hosted models with no external API calls, for offline or restricted networks.
After edits it runs your lint and test commands and iterates on the failures it sees. Architect mode splits a task between a model that proposes and a model that writes the edits. Aider reports 81 to 88% accuracy on its own polyglot coding benchmark. Its loop ends at a local commit, and Aider documents no pull request or hosted pipeline integration.
What it does well
Where it falls short
Best for reaching 75+ model providers: OpenCode connects to 75+ model providers, local models among them, which fits developers who want Claude and other models in one open-source agent.
Price Free, then $10 a month
OpenCode is an open-source coding agent for the terminal, desktop, code editors and the browser. Claude models work with an Anthropic API key, through OpenCode’s own gateway, or by connecting a Claude subscription directly. A GitHub Copilot or ChatGPT Plus or Pro login can drive it on models already included in that subscription.
The core is free. OpenCode Go costs $10 a month and Go Plus $40 a month, and OpenCode Zen bills per token as you go. Single sign-on is included with every workspace, with no enterprise tier required.
A build agent with full access and a read-only plan agent switch with Tab, and a general subagent handles multi-step searches. A headless server exposes sessions, messages, files and agents through an API with a generated library. In the GitHub flow it stops at a branch and a pull request.
What it does well
Where it falls short
Best for teams working from GitHub issues and pull requests: GitHub Copilot CLI works with GitHub issues and opens pull requests on GitHub.com, which fits teams whose work already runs through GitHub issues and pull requests.
Price Free, then $10 a month
GitHub Copilot CLI plans, edits and runs code and works with issues and pull requests from the terminal. Claude is the default model, and further Claude versions are picked with the /model command. OpenAI models and Gemini models sit in the same picker. It ships with GitHub’s MCP server enabled and connects to custom MCP servers.
Copilot has a free plan, and paid access starts at $10 a month. Team plans bill per granted seat per month, $19 on Business and $39 on Enterprise.
Every file change and command needs approval by default, and autopilot mode and the blanket allow flag make unattended runs opt-in. Programmatic mode takes a single prompt and exits, so scripts drive it with a fine-grained personal access token. Auto-compaction keeps long sessions going past the token limit for legacy codebase work.
What it does well
Where it falls short
Best for repo-wide migrations with many subagents: Claude Code runs many subagents over a repository for audits and large migrations, and Anthropic’s own example is a 500-file migration.
Price From $20 a month
Claude Code is Anthropic’s agentic coding tool. It edits your codebase, runs commands and opens pull requests. Claude is its only model family, with Fable, Opus, Sonnet and Haiku aliases. You can bring your own Anthropic key or your own Amazon Bedrock, Google Cloud or Microsoft Foundry account.
There is no free plan. Pro costs $20 a month billed monthly or $17 a month billed annually, and Max starts at $100 a month. Its entry plan is the dearest, at $20 a month.
Auto mode has a classifier approve tool calls, and routines and background sessions run unattended, including in the cloud. GitHub Actions and GitLab pipelines run it inside your own pipelines, and an agent library for Python and TypeScript exposes the same agent loop.
What it does well
Where it falls short
Source: Each vendor’s pricing page, read between 21 October 2026 and 24 October 2026.
A paid plan on OpenCode costs $10 a month and on GitHub Copilot CLI $10 a month, which is also the median entry plan. Claude Code’s entry plan costs $20 a month, while zot and Aider have free plans.
“By default,
copilotutilizes Claude Sonnet 4.5. Run the/modelslash command to choose from other available models”
We compared 5 agents on price, free plan and 3 questions a buyer asks, reading each vendor’s pricing page and product pages between 2 September 2026 and 24 October 2026. We did not sign up for or run any of them. Agents that answer yes to “Does it support Claude?” come first, then those that answer partly, each from the lowest starting price. We left out 2 that answer no or whose pages do not say. In all we answered 37 questions about what they do.
All 5 run Claude models. zot reaches Anthropic with an API key or by logging in with a Claude Pro or Max subscription, and Aider launches with an Anthropic key. OpenCode takes an Anthropic key, its own gateway or a connected Claude subscription. GitHub Copilot CLI uses Claude as its default model, with more Claude versions under the /model command.
Yes: zot, Aider, OpenCode and GitHub Copilot CLI have a free plan, 4 of the 5. Claude Code has no free plan, so using it starts with a paid Claude plan.
Claude Code costs $20 a month, the dearest entry plan. Its Pro plan is $17 a month billed annually, and Max starts at $100 a month. OpenCode Go costs $10 a month and Go Plus $40 a month, and GitHub Copilot CLI costs $10 a month.
zot, Aider, OpenCode and GitHub Copilot CLI run OpenAI models, and Claude Code does not. zot and OpenCode also accept a ChatGPT Plus or Pro login in place of an API key, Aider takes an OpenAI key, and GitHub Copilot CLI offers OpenAI models in its model picker. Claude Code lets you choose the model per session or subagent within Claude only, and every provider path it documents serves Claude models.
Claude Code does: it is one of the 2 of the 5 with MCP support, and it runs as an MCP server other clients connect to. GitHub Copilot CLI works as an MCP client, with GitHub’s MCP server enabled and custom servers supported. OpenCode consumes local and remote MCP servers, and other software can drive it through its API. Aider has neither an MCP server nor an MCP client.
Yes, with zot, Aider or OpenCode, and GitHub Copilot CLI is a client for GitHub’s hosted service. zot is one binary that keeps configuration, credentials and transcripts in a local state directory. Aider installs on your own machine and can run against self-hosted models with no external API calls, for offline or security-restricted environments. OpenCode runs on your own machine or server, and enterprises can point it at an internal AI gateway.
Yes: zot, Aider and OpenCode publish their source, and Claude Code does not. zot and OpenCode use a permissive open-source license that allows commercial use and modification, and Aider’s source is on GitHub under a permissive license. Claude Code’s public repository holds plugins, docs and the issue tracker under an all-rights-reserved license.
This spot is open
All 9 terminal coding agents
First paid plans from $5 to $30 a month.
What changed in the index
Agents we’ve just listed and every plan whose price changed.
Buyer's guide
Most AI agent frameworks are free to start, and the bill arrives with the hosted layer, priced by plan, seat, credits or usage.
Buyer's guide
6 of 8 coding agents let you keep code out of training; goose and OpenCode depend on the model. Ranked by opt-out, then entry price from $10 a month.
Buyer's guide
Aissist.io runs AI agents inside your existing helpdesk for small and mid-sized teams, starts free, then meters each interaction so cost tracks volume.
Buyer's guide
Pick by where it runs, how it bills and how you get out: self-host for data control, seat plans for teams, or a firm that builds the agents for you.