What is the best free alternative to OpenAI Codex CLI?
Gemini CLI is the closest free alternative to OpenAI Codex CLI: same Terminal & CLI Agents sub-category, and it is free. Open-source terminal agent from Google
Best free OpenAI Codex CLI alternatives
Looking for a free alternative to OpenAI Codex CLI? Here are 9 terminal & cli agents worth trying — 9 with a free tier. OpenAI Codex CLI itself is free tier + paid.
| Tool | OpenAI Codex CLI (you searched) | Gemini CLI | Aider | Cline |
|---|---|---|---|---|
| Pricing | freemium | free | free | free |
| Best for | #1 on Terminal-Bench with GPT-5-series | Open-source terminal agent from Google | Open-source AI pair programmer in your terminal | Open-source autonomous coding agent for VS Code |
| Visit | Open ↗ | Open ↗ | Open ↗ | Open ↗ |
OpenAI Codex CLI alternatives — straight answers
Are there free OpenAI Codex CLI alternatives?
Yes — 9 of the 9 alternatives listed here are free or freemium: Gemini CLI, Aider, Cline, OpenCode, Crush. None of them are paid-only.
Is OpenAI Codex CLI free?
OpenAI Codex CLI is free tier + paid. There is a free tier you can work in, with paid plans above it.
How were these OpenAI Codex CLI alternatives chosen?
They are the other tools in Terminal & CLI Agents, then the rest of Code & Development, ordered free tiers first and capped at 9. There is no sponsorship and no paid placement in that ordering — only the pricing tier decides.
All OpenAI Codex CLI alternatives
Browse Terminal & CLI Agents →Gemini CLI
Terminal & CLI Agents
✦ WhyA OpenAI Codex CLI alternative — Open-source terminal agent from Google.
- Open-source terminal agent from Google
- Huge free daily model quota
- Built-in tools and MCP support
- Great value for everyday coding
Aider
Terminal & CLI Agents
✦ WhyA OpenAI Codex CLI alternative — Open-source AI pair programmer in your terminal.
- Open-source AI pair programmer in your terminal
- Git-aware commits and edits
- Works with any model (bring your key)
- Free to use
Cline
Terminal & CLI Agents
✦ WhyA OpenAI Codex CLI alternative — Open-source autonomous coding agent for VS Code.
- Open-source autonomous coding agent for VS Code
- Plan/Act modes with approvals
- Bring your own API key or model
- MCP tool support
OpenCode
Terminal & CLI Agents
✦ WhyA OpenAI Codex CLI alternative — Fully open-source terminal/IDE/desktop coding agent, MIT licensed.
- Fully open-source terminal/IDE/desktop coding agent, MIT licensed
- Bring-your-own model across 75+ providers, free models included
- Parallel agent sessions with shareable session links
Crush
Terminal & CLI Agents
✦ WhyA OpenAI Codex CLI alternative — Terminal coding agent from Charm with LSP-aware context.
- Terminal coding agent from Charm with LSP-aware context
- Cross-platform incl. Android/BSD, MCP server support over HTTP/stdio/SSE
- Agent Skills standard support for extensibility
Goose
Terminal & CLI Agents
✦ WhyA OpenAI Codex CLI alternative — Open-source agent (now under Agentic AI Foundation/Linux Foundation) usable as CLI, desktop app or API.
- Open-source agent (now under Agentic AI Foundation/Linux Foundation) usable as CLI, desktop app or API
- 70+ MCP extensions, 15+ LLM providers supported
- Apache-2.0 licensed, built in Rust
Qwen Code
Terminal & CLI Agents
✦ WhyA OpenAI Codex CLI alternative — Open-source terminal CLI adapted from Gemini CLI, tuned for Qwen3-Coder models.
- Open-source terminal CLI adapted from Gemini CLI, tuned for Qwen3-Coder models
- OpenAI-SDK compatible for flexible model backends
- Free npm install, agentic coding workflows
Amp
Terminal & CLI Agents
✦ WhyA OpenAI Codex CLI alternative — Multi-model routing across frontier models with no artificial usage caps.
- Multi-model routing across frontier models with no artificial usage caps
- Four agent reasoning modes (low/medium/high/ultra) plus parallel subagents
- Remote 'Orbs' execution machines and an Oracle deep-reasoning tool
Warp
Terminal & CLI Agents
✦ WhyA OpenAI Codex CLI alternative — Terminal rebuilt as an agentic development environment for any coding agent.
- Terminal rebuilt as an agentic development environment for any coding agent
- Multi-agent orchestration with model routing and codebase indexing
- Oz cloud agent platform for moving from local to cloud execution