Looking for a free alternative to OpenAI Codex CLI? Here are 9 terminal & cli agents worth trying — 8 with a free tier. OpenAI Codex CLI itself is free tier + paid.
| Tool | OpenAI Codex CLI (you searched) | Freebuff | Claude Code | Gemini CLI |
|---|---|---|---|---|
| Pricing | freemium | freemium | paid | free |
| Best for | #1 on Terminal-Bench with GPT-5-series | Terminal coding agent that needs no API key, subscription or card; funded by small text ads shown in the CLI | Terminal-native agent, best on large codebases | Open-source terminal agent from Google |
| Visit | Open ↗ | Open ↗ | Open ↗ | Open ↗ |
Freebuff is the closest free alternative to OpenAI Codex CLI: same Terminal & CLI Agents sub-category, and it is free tier + paid. Terminal coding agent that needs no API key, subscription or card; funded by small text ads shown in the CLI
Yes — 8 of the 9 alternatives listed here are free or freemium: Freebuff, Gemini CLI, Aider, Cline, OpenCode. The other 1 are trial or paid.
OpenAI Codex CLI is free tier + paid. There is a free tier you can work in, with paid plans above it.
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.
✦ WhyA OpenAI Codex CLI alternative — Terminal coding agent that needs no API key, subscription or card; funded by small text ads shown in the CLI.
✦ WhyA OpenAI Codex CLI alternative — Terminal-native agent, best on large codebases.
✦ WhyA OpenAI Codex CLI alternative — Open-source terminal agent from Google.
✦ WhyA OpenAI Codex CLI alternative — Open-source AI pair programmer in your terminal.
✦ WhyA OpenAI Codex CLI alternative — Open-source autonomous coding agent for VS Code.
✦ WhyA OpenAI Codex CLI alternative — Fully open-source terminal/IDE/desktop coding agent, MIT licensed.
✦ WhyA OpenAI Codex CLI alternative — Terminal coding agent from Charm with LSP-aware context.
✦ WhyA OpenAI Codex CLI alternative — Open-source agent (now under Agentic AI Foundation/Linux Foundation) usable as CLI, desktop app or API.
✦ WhyA OpenAI Codex CLI alternative — Open-source terminal CLI adapted from Gemini CLI, tuned for Qwen3-Coder models.