GPT-6 always returns "Invalid prompt."

What version of Codex CLI is running?

codex-cli 0.153.4

What subscription do you have?

20x pro

Which model were you using?

gpt-6-astra low

What platform is your computer?

Linux 6.18.33.2-microsoft-standard-WSL2 x86_64 unknown

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

Windows Terminal (WSL / PowerShell)

Codex doctor report

{
  "schemaVersion": 1,
  "generatedAt": "1788919569s since unix epoch",
  "overallStatus": "warning",
  "codexVersion": "0.153.4",
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      "category": "app-server",
      "status": "ok",
      "summary": "background server is not running",
      "details": {
        "control socket": "/home/d/.codex/app-server-control/app-server-control.sock",
        "daemon state dir": "/home/d/.codex/app-server-daemon",
        "mode": "ephemeral",
        "pid file": "/home/d/.codex/app-server-daemon/app-server.pid (missing)",
        "settings": "/home/d/.codex/app-server-daemon/settings.json (missing)",
        "status": "not running",
        "update-loop pid file": "/home/d/.codex/app-server-daemon/app-server-updater.pid (missing)"
      },
      "remediation": null,
      "durationMs": 0
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      "category": "auth",
      "status": "ok",
      "summary": "auth is configured",
      "details": {
        "auth file": "/home/d/.codex/auth.json",
        "auth storage mode": "File",
        "stored API key": "false",
        "stored ChatGPT tokens": "true",
        "stored agent identity": "false",
        "stored auth mode": "chatgpt"
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      "remediation": null,
      "durationMs": 0
    },
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      "status": "ok",
      "summary": "config loaded",
      "details": {
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        "feature flag overrides": "none",
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        "log dir": "/home/d/.codex/log",
        "mcp servers": "5",
        "model": "gpt-6-astra",
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        "git exec path": "/usr/lib/git-core",
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        "repo detected": "false",
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      "durationMs": 27
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    "installation": {
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      "category": "install",
      "status": "ok",
      "summary": "installation looks consistent",
      "details": {
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        "install context": "npm (package /home/d/.asdf/installs/nodejs/24.14.1/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl, bin /home/d/.asdf/installs/nodejs/24.14.1/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/bin, resources /home/d/.asdf/installs/nodejs/24.14.1/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/codex-resources, path /home/d/.asdf/installs/nodejs/24.14.1/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/codex-path)",
        "managed by Vite+": "false",
        "managed by bun": "false",
        "managed by npm": "true",
        "managed by pnpm": "false",
        "managed package root": "/home/d/.asdf/installs/nodejs/24.14.1/lib/node_modules/@openai/codex",
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    "mcp.config": {
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      "details": {
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        "disabled servers": "0",
        "stdio servers": "5"
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      "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 present": "HTTP_PROXY, HTTPS_PROXY, NO_PROXY",
        "respect system proxy": "disabled"
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    "network.provider_reachability": {
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      "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"
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    "network.websocket_reachability": {
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      "category": "websocket",
      "status": "ok",
      "summary": "Responses WebSocket handshake succeeded",
      "details": {
        "DNS": "1 IPv4, 1 IPv6, first IPv4",
        "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 present": "HTTP_PROXY, HTTPS_PROXY, NO_PROXY",
        "reasoning header": "false",
        "server model present": "false",
        "supports websockets": "true",
        "wire API": "responses"
      },
      "remediation": null,
      "durationMs": 1586
    },
    "runtime.provenance": {
      "id": "runtime.provenance",
      "category": "runtime",
      "status": "ok",
      "summary": "running npm on linux-x86_64",
      "details": {
        "commit": "unknown",
        "current executable": "/home/d/.asdf/installs/nodejs/24.14.1/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/bin/codex",
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        "last checked at": "2026-09-09T01:28:53.358012907Z",
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  }
}

What issue are you seeing?

Whenever I use GPT-6, I keep getting an "Invalid prompt" error stating that my prompt was flagged as potentially violating the usage policy (referencing https://platform.openai.com/docs/guides/reasoning#advice-on-prompting), whereas GPT-5.6 works fine.

What steps can reproduce the bug?

Uploaded thread: 01a083e7-2797-7e02-9ed4-babb95416f9c

What is the expected behavior?

I look forward to a normal response.

Additional information

No response

No source file or test is named in the report. Reproduce the failure with codex-cli 0.153.4, the gpt-6-astra low model, and the supplied WSL environment, then trace the CLI entry point that produces “Invalid prompt.” Done means valid prompts are accepted by that model or the failure is reported with an actionable cause.