OpenAI Codex release notes: 0.155.0 adds terminal voice

OpenAI Codex CLI 0.155.0 adds experimental voice conversations in the terminal with live transcripts and microphone controls. Codex CLI is OpenAI's terminal-based coding agent. The feature is off by default and requires a build with native voice runtime support.

OpenAI Codex release notes: voice in CLI 0.155.0

OpenAI published the version on September 17. During a voice conversation, the terminal shows transcripts, conversation status, and audio levels. Final answers from tasks handed off by voice are spoken aloud, while intermediate reasoning and commentary stay unspoken. Answers to typed questions are not spoken either.

Source: OpenAI Codex 0.155.0 release notes.

Source: OpenAI: terminal voice conversations and spoken answers.

Human step: enable Voice conversations

If you install through npm, OpenAI's changelog provides this command:

npm install -g @openai/[email protected]

Source: OpenAI Codex changelog.

1. Enter /experimental in Codex and enable Voice conversations.
2. Restart Codex.
3. Enter /voice to start the conversation.

If the client lacks native voice runtime support, server-discovered voice entries are hidden. The version number alone does not mean voice is available in every installation.

Source: OpenAI: enabling Voice conversations and runtime requirements.

Use /voice mute for microphone control and /voice stop to end the conversation. Codex also stops voice when you switch threads or disconnect.

Source: OpenAI: voice commands and session lifecycle.

Short example: use the new Codex feature

Once the voice conversation is running, say: "I want to discuss a bug. Ask me one question at a time."

If you prefer to provide a written instruction first, paste:

Help me describe a bug for a developer. First ask what I was trying to do. Then ask one question at a time about what happened and what I expected.

Then continue speaking. Check that:

• The transcript captures the problem you describe.
• Codex asks for missing details rather than inventing an explanation.

This example is a suggested conversation starter, not a special command or a guarantee of answer quality.