Astra switches to my native language, which was never mentioned to it, for no reason mid-conversation

What version of Codex CLI is running?

0.153.4

What subscription do you have?

Pro 20x

Which model were you using?

gpt-6-astra medium

What platform is your computer?

Linux 7.0.0-30-generic x86_64 x86_64

What terminal emulator and version are you using (if applicable)?

tmux

Codex doctor report

{
  "schemaVersion": 1,
  "generatedAt": "1788812820s since unix epoch",
  "overallStatus": "warning",
  "codexVersion": "0.153.4",
  "checks": {
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      "id": "app_server.status",
      "category": "app-server",
      "status": "ok",
      "summary": "background server is not running",
      "details": {
        "control socket": "/home/jidacf/.codex/app-server-control/app-server-control.sock",
        "daemon state dir": "/home/jidacf/.codex/app-server-daemon",
        "mode": "ephemeral",
        "pid file": "/home/jidacf/.codex/app-server-daemon/app-server.pid (missing)",
        "settings": "/home/jidacf/.codex/app-server-daemon/settings.json (missing)",
        "status": "not running",
        "update-loop pid file": "/home/jidacf/.codex/app-server-daemon/app-server-updater.pid (missing)"
      },
      "remediation": null,
      "durationMs": 0
    },
    "auth.credentials": {
      "id": "auth.credentials",
      "category": "auth",
      "status": "ok",
      "summary": "auth is configured",
      "details": {
        "auth file": "/home/jidacf/.codex/auth.json",
        "auth storage mode": "File",
        "stored API key": "false",
        "stored ChatGPT tokens": "true",
        "stored agent identity": "false",
        "stored auth mode": "chatgpt"
      },
      "remediation": null,
      "durationMs": 0
    },
    "config.load": {
      "id": "config.load",
      "category": "config",
      "status": "ok",
      "summary": "config loaded",
      "details": {
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        "config.toml": "/home/jidacf/.codex/config.toml",
        "config.toml parse": "ok",
        "cwd": "/home/jidacf",
        "enabled feature flags": "shell_tool, view_image, sleep_tool, unified_exec, unified_exec_zsh_fork, shell_snapshot, content_item_kinds, code_mode_host, terminal_resize_reflow, sqlite, hooks, enable_request_compression, unbounded_connection_retries, multi_agent, apps, tool_search_always_defer_mcp_tools, tool_suggest, plugins, in_app_browser, in_app_chat, in_app_dictation, in_app_local_automation, in_app_updates, browser_use, browser_use_full_cdp_access, browser_use_external, computer_use, remote_plugin, plugin_sharing, image_generation, resize_all_images, item_ids, skill_mcp_dependency_install, skill_search, mentions_v2, steer, guardian_approval, goals, context_management, collaboration_modes, tool_call_mcp_elicitation, auth_elicitation, personality, fast_mode, tui_app_server, remote_compaction_v2, compaction_image_budget, workspace_dependencies",
        "feature flag overrides": "context_management=true",
        "feature flags enabled": "48",
        "legacy feature flag": "collab -> multi_agent",
        "log dir": "/home/jidacf/.codex/log",
        "mcp servers": "1",
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    "installation": {
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      "status": "ok",
      "summary": "installation looks consistent",
      "details": {
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        "managed by Vite+": "false",
        "managed by bun": "false",
        "managed by npm": "true",
        "managed by pnpm": "false",
        "managed package root": "/home/jidacf/.nvm/versions/node/v22.22.0/lib/node_modules/@openai/codex",
        "npm update target": "/home/jidacf/.nvm/versions/node/v22.22.0/lib/node_modules/@openai/codex"
      },
      "remediation": null,
      "durationMs": 95
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    "mcp.config": {
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      "category": "mcp",
      "status": "ok",
      "summary": "MCP configuration is locally consistent",
      "details": {
        "configured servers": "1",
        "disabled servers": "0",
        "stdio servers": "1"
      },
      "remediation": null,
      "durationMs": 0
    },
    "network.env": {
      "id": "network.env",
      "category": "network",
      "status": "ok",
      "summary": "network-related environment looks readable",
      "details": {
        "managed proxy": "not configured",
        "proxy env vars": "none",
        "respect system proxy": "disabled"
      },
      "remediation": null,
      "durationMs": 0
    },
    "network.provider_reachability": {
      "id": "network.provider_reachability",
      "category": "reachability",
      "status": "ok",
      "summary": "active provider endpoints are reachable over HTTP",
      "details": {
        "ChatGPT inference URL": "https://chatgpt.com/backend-api/<redacted> reachable (HTTP 405)",
        "reachability mode": "ChatGPT auth"
      },
      "remediation": null,
      "durationMs": 136
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    "network.websocket_reachability": {
      "id": "network.websocket_reachability",
      "category": "websocket",
      "status": "ok",
      "summary": "Responses WebSocket handshake succeeded",
      "details": {
        "DNS": "2 IPv4, 2 IPv6, first IPv6",
        "auth mode": "chatgpt",
        "connect timeout": "15000 ms",
        "endpoint": "wss://chatgpt.com/backend-api/<redacted>",
        "handshake result": "HTTP 101 Switching Protocols",
        "model provider": "openai",
        "provider name": "OpenAI",
        "proxy env vars": "none",
        "reasoning header": "false",
        "server model present": "false",
        "supports websockets": "true",
        "wire API": "responses"
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      "remediation": null,
      "durationMs": 942
    },
    "runtime.provenance": {
      "id": "runtime.provenance",
      "category": "runtime",
      "status": "ok",
      "summary": "running npm on linux-x86_64",
      "details": {
        "commit": "unknown",
        "current executable": "/home/jidacf/.nvm/versions/node/v22.22.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/bin/codex",
        "install method": "npm (package /home/jidacf/.nvm/versions/node/v22.22.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl, bin /home/jidacf/.nvm/versions/node/v22.22.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/bin, resources /home/jidacf/.nvm/versions/node/v22.22.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/codex-resources, path /home/jidacf/.nvm/versions/node/v22.22.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/codex-path)",
        "platform": "linux-x86_64",
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      "details": {
        "approval policy": "OnRequest",
        "codex-linux-sandbox helper": "/home/jidacf/.codex/tmp/arg0/codex-arg0qAKSOZ/codex-linux-sandbox",
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      "details": {
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      "details": {
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        "rollout DB scan cap reached": "false",
        "rollout DB scan error sample": [
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          "fields": []
        },
        {
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          "measured": "2 scan errors, 0 malformed names, scan cap reached: false",
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          "fields": []
        }
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    "system.disk": {
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    "system.environment": {
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        "stderr is terminal": "true",
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        "terminal": "GNOME Terminal",
        "terminal size": "145x33"
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    "terminal.title": {
      "id": "terminal.title",
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      "status": "ok",
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      "details": {
        "terminal title activity": "true",
        "terminal title items": "activity, project-name",
        "terminal title project source": "cwd",
        "terminal title project value": "jidacf",
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    "updates.status": {
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      "status": "ok",
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      "details": {
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        "check for update on startup": "true",
        "last checked at": "2026-09-07T01:25:02.412749999Z",
        "latest version": "0.153.4",
        "latest version status": "current version is not older",
        "npm update target": "/home/jidacf/.nvm/versions/node/v22.22.0/lib/node_modules/@openai/codex",
        "update action": "npm install -g @openai/codex",
        "version cache": "/home/jidacf/.codex/version.json"
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      "remediation": null,
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    }
  }
}

What issue are you seeing?

Astra switches to my native language (portuguese), which was never mentioned to it, for no reason, mid-conversation, instead of English (the language I always use when talking to it). There was absolutely no reason to switch to Portuguese in the conversations I had with it.

this has never happened with older models, but it keeps happening with Astra.

What steps can reproduce the bug?

Uploaded thread: 01a072bc-5bf3-7783-8a1b-044e2fe74ac2

What is the expected behavior?

No response

Additional information

No response

Start by reproducing the language switch in Codex CLI 0.153.4 with the gpt-6-astra medium model on Linux under tmux, using the provided doctor report as environment context. Trace the conversation handling from the CLI entry point and establish a reproducible trigger; done means the unexpected mid-conversation language change is explained and prevented or covered by a regression test.