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Ranked · Coding agents

Best Open source Coding agents

12 quality-gated open source coding agents, compared on structured facts · pricing $5–$20.

12 agents, compared. Start with fit and price, then open the full assessment. Payment does not alter this ranking. Selection and method ↓

All picks at a glance

Compare fit and price, then choose a name to read the full assessment.

#AgentBest forStarts at
1Kilo CodeFree, then $15/month
2gooseDevs who want an open source coding agent that reuses an existing Claude or ChatGPT planFree
3ZedDevelopers who want a fast, open-source editor and the freedom to run Claude Code, Codex, Gemini CLI or other vendors' own agents natively via the Agent Client Protocol Zed created, instead of being locked into one editor's built-in agent.Free, then $10/month
4WarpDevelopers and teams who want one open platform that runs and coordinates multiple coding agents (Claude Code, Codex, Gemini CLI, Warp Agent) side by side across terminal, CLI and cloud, with shared team context and programmatic API access to cloud agent runs.Free, then $20/month
5LettaDevelopers and researchers who specifically need an agent whose memory, skills and identity genuinely persist and evolve across long-running sessions, rather than reset on every call.Free, then $20/month
6Codex CLIDevelopers who already pay for a ChatGPT plan and want a terminal-native agent with granular, inspectable sandbox/permission controls across CLI, desktop and IDE surfaces.Free, then $8/month
7OpenCodeDevelopers who want a genuinely free, fully open-source coding agent that works with any model provider, including their own local Ollama models, without being locked into one vendor's terminal tool.Free, then $10/month
8zotDevelopers who want a fast, free, Go-native coding-agent harness with real session-branching control and are comfortable running fast-moving, self-described "beta forever" software from an independent maintainer.Free
9JugglerDevelopers who want hands-on visibility into what an AI coding agent is doing to their codebase and accept early-stage, self-hosted, open-source software.Free
10OpenHandsOpen source-minded engineering teams and enterprises that want a self-hostable coding agent platformFree, then $0.10/1m input tokens
11AiderMost mature MIT-licensed option, no vendor lock-inFree
12ClineDevelopers and teams who want a transparent, open-source, model-agnostic agent they fully control and pay for by usage, with optional flat-rate access to open-weight models.Free, then $9.99/month
Selection, context, and ranking method

12 of the 28 coding agents in this index qualify as open source. Every one is a researched, quality-gated listing, not a scraped row.

Across the set: paid plans span $5–$20, and 12 offer a free or freemium tier.

12 of 12 carry a fact-verification date; the freshest check is 2026-09-30.

Open-source is a genuine spread of licenses here, not one thing: Apache-2.0 (OpenAI Codex CLI) from a frontier lab that also sells closed products elsewhere, AGPLv3 (Juggler) from an independent project, and MIT (Aider, Cline, OpenCode, OpenHands, Zot). The license affects what you're allowed to do if you fork or redistribute, even though all seven are free to use today.

Assembled programmatically from this index: every entry is a researched, quality-gated listing in Coding agents carrying the "Open source" tag, ranked by tier then name. The numbers (12 tools, paid plans $5–$20) are computed from the structured facts on those listings. This page exists only because enough listings carry that tag to make the comparison worth reading.

The full ranking method →

The ranking

  1. Editor’s pick

    #1

    Kilo Code

    Open source AI coding agent for VS Code, JetBrains, CLI and cloud, with 500+ models at provider rates.

    Visit Kilo Code ↗Read the review →Get a quote →From Free
  2. #2

    goose

    Open-source local AI agent — desktop app, CLI and ACP server — running on the LLM provider you bring.

    Best forDevs who want an open source coding agent that reuses an existing Claude or ChatGPT plan

    Visit goose ↗Read the review →Get a quote →From Free
  3. #3

    Zed

    Rust-based code editor with a built-in agent panel, ACP external agents and Zed-hosted models.

    Best forDevelopers who want a fast, open-source editor and the freedom to run Claude Code, Codex, Gemini CLI or other vendors' own agents natively via the Agent Client Protocol Zed created, instead of being locked into one editor's built-in agent.

    Visit Zed ↗Read the review →Get a quote →From Free

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  5. #4

    Warp

    Agentic development environment: a terminal, a standalone agent CLI, and unattended cloud coding agents.

    Best forDevelopers and teams who want one open platform that runs and coordinates multiple coding agents (Claude Code, Codex, Gemini CLI, Warp Agent) side by side across terminal, CLI and cloud, with shared team context and programmatic API access to cloud agent runs.

    Visit Warp ↗Read the review →Get a quote →From Free
  6. #5

    Letta

    Stateful agent harness, cloud and SDK for agents with persistent, git-versioned memory.

    Best forDevelopers and researchers who specifically need an agent whose memory, skills and identity genuinely persist and evolve across long-running sessions, rather than reset on every call.

    Visit Letta ↗Read the review →Get a quote →From Free
  7. #6

    Codex CLI

    OpenAI's terminal coding agent for inspecting, editing and running repository code from the shell.

    Best forDevelopers who already pay for a ChatGPT plan and want a terminal-native agent with granular, inspectable sandbox/permission controls across CLI, desktop and IDE surfaces.

    Choose Codex CLI if you want an open-source agent backed by a large lab's ongoing investment (OpenAI), not an independent project, with the tradeoff that it defaults to OpenAI's own models.

    Visit Codex CLI ↗Read the review →Get a quote →From Free
  8. #7

    OpenCode

    Open source AI coding agent for the terminal, desktop app and IDE, with 75+ model providers.

    Best forDevelopers who want a genuinely free, fully open-source coding agent that works with any model provider, including their own local Ollama models, without being locked into one vendor's terminal tool.

    Visit OpenCode ↗Read the review →Get a quote →From Free
  9. #8

    zot

    Single-binary terminal coding agent harness in Go, with 30+ model providers and any-language extensions.

    Best forDevelopers who want a fast, free, Go-native coding-agent harness with real session-branching control and are comfortable running fast-moving, self-described "beta forever" software from an independent maintainer.

    Visit zot ↗Read the review →Get a quote →From Free
  10. #9

    Juggler

    Visual workbench for AI coding agents: branching conversation trees, inspectable model transactions, local or remote.

    Best forDevelopers who want hands-on visibility into what an AI coding agent is doing to their codebase and accept early-stage, self-hosted, open-source software.

    Choose Juggler if you specifically want AGPLv3 (a copyleft license that affects SaaS redistribution) and a GUI-first, branching-session workflow.

    Visit Juggler ↗Read the review →Get a quote →From Free
  11. #10

    OpenHands

    Open-source software engineering agent with GUI, CLI, SDK and an enterprise control plane.

    Best forOpen source-minded engineering teams and enterprises that want a self-hostable coding agent platform

    Choose OpenHands if you need an open-source platform designed for enterprise self-hosting, with sandboxed deployment and an embeddable SDK that a personal CLI tool does not give you.

    Visit OpenHands ↗Read the review →Get a quote →From Free
  12. #11

    Aider

    Open-source terminal AI pair programmer that edits files in your local git repo and commits the changes.

    Best forMost mature MIT-licensed option, no vendor lock-in

    MIT-licensed, terminal-native, and the most mature of the open-source options here, so a safe default if you just want a free, transparent agent with no vendor lock-in.

    Visit Aider ↗Read the review →Get a quote →From Free
  13. #12

    Cline

    Open-source coding agent for VS Code, JetBrains, the terminal and CI, running on whichever model you bring.

    Best forDevelopers and teams who want a transparent, open-source, model-agnostic agent they fully control and pay for by usage, with optional flat-rate access to open-weight models.

    Visit Cline ↗Read the review →Get a quote →From Free

Side by side

Scroll across to compare every product. Feature names stay in view.One card per question, with every product answering it in turn.

FeatureKilo CodegooseZedWarpLettaCodex CLIOpenCodezotJugglerOpenHandsAiderCline
DescriptionOpen source AI coding agent for VS Code, JetBrains, CLI and cloud, with 500+ models at provider rates.Open-source local AI agent — desktop app, CLI and ACP server — running on the LLM provider you bring.Rust-based code editor with a built-in agent panel, ACP external agents and Zed-hosted models.Agentic development environment: a terminal, a standalone agent CLI, and unattended cloud coding agents.Stateful agent harness, cloud and SDK for agents with persistent, git-versioned memory.OpenAI's terminal coding agent for inspecting, editing and running repository code from the shell.Open source AI coding agent for the terminal, desktop app and IDE, with 75+ model providers.Single-binary terminal coding agent harness in Go, with 30+ model providers and any-language extensions.Visual workbench for AI coding agents: branching conversation trees, inspectable model transactions, local or remote.Open-source software engineering agent with GUI, CLI, SDK and an enterprise control plane.Open-source terminal AI pair programmer that edits files in your local git repo and commits the changes.Open-source coding agent for VS Code, JetBrains, the terminal and CI, running on whichever model you bring.
CategoryCoding agentsCoding agentsCoding agentsCoding agentsAgent platforms, Coding agents, Agent frameworksCoding agentsCoding agentsCoding agentsCoding agentsCoding agentsCoding agentsCoding agents
APIYesYesYesYesYesYesYesYesNoYesYesYes
TagsOpen sourceAPIFree tierSelf-hostedEnterpriseGPTClaudeOpen modelsAutonomousMulti-agentAPIFree tierOpen sourceSelf-hostedAutonomousMulti-agentGPTClaudeOpen modelsOpen sourceFree tierMulti-agentClaudeGPTSelf-hostedOpen modelsEnterpriseOpen sourceFree tierMulti-agentAPIClaudeGPTEnterpriseAutonomousSelf-hostedOpen modelsOpen sourceSelf-hostedAPIFree tierEnterpriseAutonomousMulti-agentGPTClaudeOpen modelsGPTAutonomousAPIFree tierOpen sourceSelf-hostedOpen modelsMulti-agentOpen sourceFree tierAPISelf-hostedOpen modelsGPTClaudeAutonomousMulti-agentOpen sourceSelf-hostedFree tierAPIClaudeGPTOpen modelsMulti-agentAutonomousOpen sourceSelf-hostedClaudeGPTOpen modelsFree tierAutonomousMulti-agentOpen sourceSelf-hostedAPIAutonomousMulti-agentEnterpriseFree tierGPTClaudeOpen modelsOpen sourceFree tierSelf-hostedClaudeOpen modelsGPTOpen sourceAPIFree tierAutonomousSelf-hostedGPTClaudeOpen modelsEnterprise

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This ranking

  • 12 agents ranked
  • paid plans $5-$20
  • 12 free or freemium
  • verified September 30, 2026
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