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Codex

OpenAI · #2 most active of 24 in Coding

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A software engineering agent that runs tasks in parallel sandboxes and opens pull requests.

Current version

0.58

Entry cost

from $20/mo

Changes / 30d

3

Capabilities

  • Codex CLI
  • Codex IDE extension
  • Codex cloud
  • Codex Micro
  • Code review
  • Security workbench
  • Code generation

Pricing

  • Plus

    $20

  • Pro

    $200

  • Business

    $25

  • API

    usage-based

    Free

Entry price over time

7/29/2026 · $208/2/2026 · $20

Geek mode

Models under the hood

  • GPT-5.2

    OpenAI

    disclosed

  • GPT-5.2-Codex

    OpenAI

    disclosed

  • GPT-5.6 Sol

    OpenAI

    disclosed

  • GPT-5.6 Terra

    OpenAI

    disclosed

  • GPT-5.6 Luna

    OpenAI

    disclosed

Context window

400K tokens

Public API

yes

Multi-model routing

yes

Stack signals

  • Rust CLI
  • Container sandbox
  • MCP

Shared model stack

Other tracked products running on the same foundation models — a quick read on how much of the catalog moves when one of these models changes.

green disclosed · amber inferred · grey unknown

Reported scale

Reference data. Each figure is whatever the source actually said — weekly users, downloads, revenue run-rate — with its own definition and date. These are not comparable between tools and are never used to rank anything.

No public usage figure on record for this product.

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Change history

  • model

    Codex added GPT-5.6 Sol, GPT-5.6 Terra, GPT-5.6 Luna to its model stack

    GPT-5.2, GPT-5.2-CodexGPT-5.2, GPT-5.2-Codex, GPT-5.6 Sol, GPT-5.6 Terra, GPT-5.6 Luna

    source
  • capability

    New capabilities: Codex CLI, Codex IDE extension, Codex cloud

    57

    source
  • capability

    Codex gained parallel cloud sandboxes and pull request drafting

    Cloud tasksCloud sandboxes, Parallel tasks, Pull request drafting

    source