OpenAI Codex
OpenAI's coding agent for the web, CLI, IDE and desktop app
About
Codex is OpenAI's coding agent, included in ChatGPT plans (Free, Go, Plus, Pro, Business, Enterprise) or usable with an API key at usage-based pricing. It runs in the Codex app, CLI, IDE extension, web and iOS, supports skills, MCP, subagents, plugins, SSH and worktrees, and can be delegated to from GitHub (@codex), Slack and Linear. Plus and above unlock GPT-6.1 Sol and GPT-6 Luna with credits for extra usage.
Key Features
Pros
- Included in ChatGPT plans you may already pay for
- Open-source CLI (Apache-2.0)
- Works across app, CLI, IDE, web and iOS
- GitHub, Slack and Linear delegation
- Pro tiers at $100, $200 and $500 scale to heavy use
Cons
- Usage limits and credits vary by plan
- Pro starts at $100/mo
- Business is $25/user billed monthly
Pricing Plans
Plus
Web, CLI, IDE and iOS
- Web, CLI, IDE & iOS
- Code review
- Slack integration
- GPT-6.1 Sol and Luna
- Credits for extra usage
Pro
From $100/mo ($100 / $200 / $500)
- Three Pro tiers: $100, $200, $500
- Ultrafast mode on the $500 tier
Supported AI Models
GPT-6 Astra
OpenAI / API
Context Window
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Latency (TTFT)
—
Pricing (Input)
Included
Pricing (Output)
Included
GPT-6.1 Sol
OpenAI / API
Context Window
—
Latency (TTFT)
—
Pricing (Input)
Included
Pricing (Output)
Included
GPT-6.1 Terra
OpenAI / API
Context Window
—
Latency (TTFT)
—
Pricing (Input)
Included
Pricing (Output)
Included
GPT-6 Sol
OpenAI / API
Context Window
—
Latency (TTFT)
—
Pricing (Input)
Included
Pricing (Output)
Included
GPT-6 Luna
OpenAI / API
Context Window
—
Latency (TTFT)
—
Pricing (Input)
Included
Pricing (Output)
Included