OpenAI Codex vs OpenCode (2026)

OpenAI Codex

by OpenAI

OpenCode

by Anomaly Innovations, Inc

Pros

• ✓One agent spans the ChatGPT desktop app, the open-source Codex CLI, IDE extensions for VS Code, Cursor and Windsurf, native Xcode and JetBrains integrations, and Codex cloud on the web and iOS.
• ✓Codex reviews GitHub pull requests and GitLab merge requests on request or automatically, and a GitHub Action, the Codex SDK and codex exec bring it into CI and scripted workflows.
• ✓Parallel tasks in separate worktrees, subagents, Skills, plugins, MCP servers and scheduled tasks let Codex take on longer and repeated work, with GPT-6 Sol and GPT-6 Luna on Plus and above.

Limitations

• –Codex usage is metered against plan limits shared with ChatGPT Work, and the number of messages varies with the model, task size and context, so heavy users on Plus may need credits or a Pro plan.
• –OpenAI removed the Codex MCP server on September 5, 2026, so other assistants can no longer call Codex over MCP, although Codex still connects out to external MCP servers.
• –The Codex documentation covers GitHub and GitLab and does not mention Bitbucket, and Codex run with an API key excludes the cloud features such as GitHub code review and Slack.

Pros

• ✓Developers can log in with GitHub Copilot or ChatGPT Plus or Pro to reuse existing subscription quotas, or connect any of 75+ providers including local models, with no separate API billing required.
• ✓Multi-session parallel agents run on the same project, and MCP client support covers local and remote servers with OAuth, so tools such as Sentry and Context7 connect inside the same workflow.
• ✓No code or context is stored, the agent is MIT licensed, and Anomaly Innovations publishes a SOC 2 Type 2 report through its Trust Center.

Limitations

• –Permissions start permissive: the Build agent edits files and runs shell commands without an approval prompt until a permission config is written, with only repeated identical calls and paths outside the project gated.
• –Model access is separate from the free agent, so developers pay a provider directly or through Go or Zen, and manage keys and accounts for each provider they use.
• –Enterprise per-seat pricing is quote-only, and the SOC 2 report and Data Processing Agreement are released through the Trust Center on request.