Codex CLI

Lightweight coding agent that runs in your terminal

Release Date:

April 30, 2025

Language:

rust

Website:

https://openai.com/codex

Provider Type:

AI Lab

Vendor:

OpenAI

Source Code Availability:

Open Source (Apache-2.0)

Development State:

active

Codex CLI preview

Features

Yes

Yes

Git Integration

deep

Yes

Yes

Yes

Yes

Yes

IDE Integration

VS Code, Zed (via ACP)

Yes

Yes

Yes

Context Window

Model-dependent

Terminal Bench

#1

on Terminal Bench Accuracy: 58.2% ±2.8

GPT-6 Astra

Tested: 2026-09-03 Terminal-Bench 4.0 View on Terminal-Bench 4.0 →

Earlier benchmarks:

Terminal-Bench 3.0: 34.6% (#2) · GPT-5.6 Sol

Terminal-Bench 2.1: 87.4% (#1) · GPT-6 Astra

Terminal-Bench 2.0: 82.2% (#4) · GPT-5.5

Scores are not comparable across benchmark versions.

#3

of 8 agents on the Coding Agent Index Score: 67%

GPT-6 Astra (max)

Measured: 2026-09-07 Coding Agent Index v1.4 View on Artificial Analysis →

Other models:

GPT-5.6 Luna (max): 57%

DeepSeek V4 Flash 0731 (max): 50%

Scores are per agent and model, not per agent.

Pricing & Models

Pricing Model

Subscription

Free Tier

No

Price Range

$20-200/mo

Supported Models

All frontier GPT, Codex models: GPT-5.6 Sol / Terra / Luna, GPT-5.5, GPT-5.4 pro, GPT-5.3-Codex, optional custom models.

Auth Method

ChatGPT subscription (OAuth), Optional BYOK support

Supported Subscriptions

Allows you to use your existing subscription plan

ChatGPT

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Last Updated: June 29, 2026

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