ChatGPT (GPT-6 Astra): Japanese chats get auto-titles mixed with Chinese/Russian

What version of the Codex App are you using (From “About Codex” dialog)?

ChatGPT web / desktop (GPT-6 Astra). Not Codex CLI-specific.

What subscription do you have?

ChatGPT (using GPT-6 Astra)

What platform is your computer?

Darwin (macOS)

What issue are you seeing?

When using GPT-6 Astra in ChatGPT with Japanese conversations, the automatically generated conversation titles frequently include Chinese and/or Russian text mixed into (or replacing) an otherwise Japanese-appropriate title.

This is not just “wrong translation of the topic.” The foreign-language fragments look unrelated to the Japanese conversation content, and match the broader pattern of contaminated / wrong-language auto-titles reported elsewhere.

Related reports:

• https://github.com/openai/codex/issues/45624 (English → Chinese titles)
• https://github.com/openai/codex/issues/37924 (English conversation, Chinese title)
• https://community.openai.com/t/random-chinese-spam-like-text-appearing-as-automatically-generated-chatgpt-chat-titles/1392443
• https://community.openai.com/t/unexpected-text-being-appended-to-generated-chat-titles/1392011

What steps can reproduce the bug?

1. Open ChatGPT and select GPT-6 Astra.
2. Start a new conversation and chat entirely in Japanese.
3. Wait for the automatic conversation title to be generated / updated.
4. Observe titles that contain Chinese and/or Russian characters mixed into (or instead of) Japanese.

Frequency: recently / repeatedly while using Astra in Japanese (not a one-off).

What is the expected behavior?

Auto-generated titles should follow the language of the conversation (Japanese here), or the user’s ChatGPT language setting—not inject unrelated Chinese/Russian text.

Additional information

• Primary language of affected chats: Japanese
• Model: GPT-6 Astra
• Contaminating languages observed in titles: Chinese, Russian
• Happy to attach concrete title examples / conversation IDs if useful

No Codex file, test, or entry point is mentioned; the report says the behavior is in ChatGPT web/desktop rather than Codex CLI. Start by checking the related issues and confirming whether this repository owns automatic title generation; done would mean Japanese chats consistently receive Japanese-appropriate titles without unrelated Chinese or Russian text.