Auravs Codex CLI
Comparison · Codex CLI · OpenAI terminal agent

Codex writes the code. Aura keeps the receipts.

OpenAI’s Codex CLI is a fast, capable terminal agent with a sandbox, an approval model and a growing set of automation hooks. Aura drives it as one of its engines, and adds the thing a sandbox cannot give you: a check that what landed is what you asked for.

A sandbox stops the agent doing damage outside the repo. Aura stops it doing damage inside.
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The short version

What each one is for

What Codex CLI is great at

  • Sandboxing and approvals

    The permission model is well thought through. You can let it run and know it will not wander off your machine.

  • Speed

    It is quick, and the terminal loop is tight.

  • Cloud handoff

    The same task can move between your machine and a hosted runner without you re-explaining it.

What Aura adds on top

  • The damage a sandbox permits

    A sandbox stops writes outside the repo. It has nothing to say about deleting a function inside the repo that four other modules call. Aura does.

  • Why, not only what

    Every commit carries the intent it was made for, and Aura checks that intent against the AST changes rather than trusting the message.

  • More than one brain

    Switch from Codex to Claude Code mid-thread without losing the conversation, and keep one shared history across both.

  • A cost meter

    Aura prints what each message cost and what the key has spent since you added it.

Head to head

Dimension by dimension

What it is
AuraThe layer that drives agents and proves their commits.
Codex CLIA terminal coding agent with a sandbox.
Safety model
AuraSemantic: what changed, what it broke, does it match the goal.
Codex CLIPerimeter: what the process is allowed to touch.
History
AuraIntent log plus proof verdict per commit, across every engine.
Codex CLISession transcript.
Cost
AuraPer-message and per-key spend, printed next to the reply.
Codex CLIWhatever the dashboard says later.
Capabilities

Side by side

Capability
Aura
Codex CLI
Writes and edits code
Process sandbox
Approval prompts
Drives several engines
AST-level semantic diff
Blocks unaccounted deletions
Goal ↔ commit proof verdict
Per-message cost meter
Open source
Compared on public capabilities, mid-2026. ● full · − partial · ✕ none.
Honest advice

When to pick which

Pick Codex CLI if…

  • You want OpenAI’s agent and its sandbox, on its own.

Pick Aura if…

  • You want the agent plus a semantic review and a proof at the commit.
  • You run Codex next to other agents and want one history.
Not either/or

Keep Codex CLI. Add the control layer.

Codex is one of Aura’s engines. Run it from the composer, or keep your own terminal — either way the Aura hook checks the commits.

Questions

Aura & Codex CLI

Does Aura need an OpenAI key?

Only if you want to run Codex. Aura is engine-agnostic; use Claude Code, Gemini CLI, a local model, or nothing at all — the semantic layer works without any agent.

Is Aura’s sandbox the same as Codex’s?

No, and it is not trying to be. Codex sandboxes the process. Aura works at the level of meaning: which symbols changed, what depended on them, and whether that matches the goal.

Ship with proof, not hope

Free public beta for macOS and Linux. Point it at a repo and keep driving Codex CLI, now with a semantic diff, a verdict and a record on every change.

Try the CLI