Codex CLI returns 404 “Model not found gpt-5.5” although /status shows GPT-5.5 is selected and usage limits are available
Open 💬 2 comments Opened Jun 23, 2026 by engalzaid
What version of Codex CLI is running?
0.142.0
What subscription do you have?
ChatGPT Plus
Which model were you using?
gpt-5.5
What platform is your computer?
Linux 7.0.12-201.fc44.x86_64 x86_64 unknown
What terminal emulator and version are you using (if applicable)?
GNOME Terminal on Linux
Codex doctor report
{
"schemaVersion": 1,
"generatedAt": "1782244060s since unix epoch",
"overallStatus": "ok",
"codexVersion": "0.142.0",
"checks": {
"app_server.status": {
"id": "app_server.status",
"category": "app-server",
"status": "ok",
"summary": "background server is not running",
"details": {
"control socket": "/home/osama/.codex/app-server-control/app-server-control.sock",
"daemon state dir": "/home/osama/.codex/app-server-daemon",
"mode": "ephemeral",
"pid file": "/home/osama/.codex/app-server-daemon/app-server.pid (missing)",
"settings": "/home/osama/.codex/app-server-daemon/settings.json (missing)",
"status": "not running",
"update-loop pid file": "/home/osama/.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/osama/.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": {
"CODEX_HOME": "/home/osama/.codex",
"config.toml": "/home/osama/.codex/config.toml",
"config.toml parse": "ok",
"cwd": "/home/osama/Desktop/Auction",
"enabled feature flags": "shell_tool, unified_exec, shell_snapshot, terminal_resize_reflow, sqlite, hooks, enable_request_compression, multi_agent, apps, tool_suggest, plugins, in_app_browser, browser_use, browser_use_external, computer_use, plugin_sharing, image_generation, resize_all_images, skill_mcp_dependency_install, mentions_v2, steer, guardian_approval, goals, collaboration_modes, tool_call_mcp_elicitation, personality, fast_mode, tui_app_server, auto_compaction, remote_compaction_v2, workspace_dependencies",
"feature flag overrides": "none",
"feature flags enabled": "31",
"log dir": "/home/osama/.codex/log",
"mcp servers": "0",
"model": "gpt-5.5",
"model provider": "openai",
"sqlite home": "/home/osama/.codex"
},
"remediation": null,
"durationMs": 0
},
"git.environment": {
"id": "git.environment",
"category": "git",
"status": "ok",
"summary": "git version 2.54.0",
"details": {
".git entry": "directory",
"PATH git #1": "/usr/bin/git",
"PATH git #2": "/usr/sbin/git",
"PATH git entries": "2",
"git branch": "main",
"git build options": "git version 2.54.0; cpu: x86_64; no commit associated with this build; sizeof-long: 8; sizeof-size_t: 8; shell-path: /bin/sh; rust: disabled; gettext: enabled; libcurl: 8.18.0; OpenSSL: OpenSSL 3.5.5 27 Jan 2026; zlib-ng: 2.3.3; SHA-1: SHA1_DC; SHA-256: SHA256_BLK; default-ref-format: files; default-hash: sha1",
"git exec path": "/usr/libexec/git-core",
"git version": "git version 2.54.0",
"repo detected": "true",
"repo root": "/home/osama/Desktop/Auction",
"selected git": "/usr/bin/git"
},
"remediation": null,
"durationMs": 21
},
"installation": {
"id": "installation",
"category": "install",
"status": "ok",
"summary": "installation looks consistent",
"details": {
"PATH codex #1": "/home/osama/.nvm/versions/node/v22.20.0/bin/codex",
"current executable": "/home/osama/.nvm/versions/node/v22.20.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/bin/codex",
"install context": "npm (package /home/osama/.nvm/versions/node/v22.20.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl, bin /home/osama/.nvm/versions/node/v22.20.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/bin, resources /home/osama/.nvm/versions/node/v22.20.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/codex-resources, path /home/osama/.nvm/versions/node/v22.20.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/codex-path)",
"managed by bun": "false",
"managed by npm": "true",
"managed package root": "/home/osama/.nvm/versions/node/v22.20.0/lib/node_modules/@openai/codex",
"npm update target": "/home/osama/.nvm/versions/node/v22.20.0/lib/node_modules/@openai/codex"
},
"remediation": null,
"durationMs": 90
},
"mcp.config": {
"id": "mcp.config",
"category": "mcp",
"status": "ok",
"summary": "no MCP servers configured",
"details": {},
"remediation": null,
"durationMs": 0
},
"network.env": {
"id": "network.env",
"category": "network",
"status": "ok",
"summary": "network-related environment looks readable",
"details": {
"proxy env vars": "none"
},
"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 base URL": "https://chatgpt.com/backend-api/ reachable (HTTP 403)",
"reachability mode": "ChatGPT auth"
},
"remediation": null,
"durationMs": 98
},
"network.websocket_reachability": {
"id": "network.websocket_reachability",
"category": "websocket",
"status": "ok",
"summary": "Responses WebSocket handshake succeeded",
"details": {
"DNS": "2 IPv4, 2 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",
"models etag present": "true",
"provider name": "OpenAI",
"proxy env vars": "none",
"reasoning header": "false",
"server model present": "false",
"supports websockets": "true",
"wire API": "responses"
},
"remediation": null,
"durationMs": 935
},
"runtime.provenance": {
"id": "runtime.provenance",
"category": "runtime",
"status": "ok",
"summary": "running npm on linux-x86_64",
"details": {
"commit": "unknown",
"current executable": "/home/osama/.nvm/versions/node/v22.20.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/bin/codex",
"install method": "npm (package /home/osama/.nvm/versions/node/v22.20.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl, bin /home/osama/.nvm/versions/node/v22.20.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/bin, resources /home/osama/.nvm/versions/node/v22.20.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/codex-resources, path /home/osama/.nvm/versions/node/v22.20.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/codex-path)",
"platform": "linux-x86_64",
"version": "0.142.0"
},
"remediation": null,
"durationMs": 0
},
"runtime.search": {
"id": "runtime.search",
"category": "search",
"status": "ok",
"summary": "search is OK (bundled)",
"details": {
"search command": "/home/osama/.nvm/versions/node/v22.20.0/lib/node_modules/@openai/codex/node_modules/@openai/codex-linux-x64/vendor/x86_64-unknown-linux-musl/codex-path/rg",
"search command readiness": "file exists",
"search provider": "bundled"
},
"remediation": null,
"durationMs": 0
},
"sandbox.helpers": {
"id": "sandbox.helpers",
"category": "sandbox",
"status": "ok",
"summary": "sandbox configuration is readable",
"details": {
"approval policy": "OnRequest",
"codex-linux-sandbox helper": "/home/osama/.codex/tmp/arg0/codex-arg0CWXEaN/codex-linux-sandbox",
"execve wrapper helper": "/home/osama/.codex/tmp/arg0/codex-arg0CWXEaN/codex-execve-wrapper",
"filesystem sandbox": "restricted",
"network sandbox": "restricted"
},
"remediation": null,
"durationMs": 0
},
"state.paths": {
"id": "state.paths",
"category": "state",
"status": "ok",
"summary": "state paths and databases are inspectable",
"details": {
"CODEX_HOME": "/home/osama/.codex (dir)",
"active rollout files": "20 files, 13485805 total bytes, 674290 average bytes",
"archived rollout files": "0 files, 0 total bytes, 0 average bytes",
"goals DB": "/home/osama/.codex/goals_1.sqlite (file)",
"goals DB integrity": "ok",
"log DB": "/home/osama/.codex/logs_2.sqlite (file)",
"log DB integrity": "ok",
"log dir": "/home/osama/.codex/log (missing)",
"memories DB": "/home/osama/.codex/memories_1.sqlite (file)",
"memories DB integrity": "ok",
"sqlite home": "/home/osama/.codex (dir)",
"state DB": "/home/osama/.codex/state_5.sqlite (file)",
"state DB integrity": "ok"
},
"remediation": null,
"durationMs": 980
},
"state.rollout_db_parity": {
"id": "state.rollout_db_parity",
"category": "threads",
"status": "ok",
"summary": "rollout files and state DB thread inventory agree",
"details": {
"default model provider": "openai",
"rollout DB active files": "20",
"rollout DB active rows": "20",
"rollout DB archive mismatches": "0",
"rollout DB archived files": "0",
"rollout DB archived rows": "0",
"rollout DB duplicate DB paths": "0",
"rollout DB duplicate rollout thread ids": "0",
"rollout DB malformed file names": "0",
"rollout DB missing active rows": "0",
"rollout DB missing archived rows": "0",
"rollout DB model providers": "openai=20",
"rollout DB rows": "20",
"rollout DB scan cap reached": "false",
"rollout DB scan errors": "0",
"rollout DB sources": "vscode=13, subagent:other=6, cli=1",
"rollout DB stale rows": "0"
},
"remediation": null,
"durationMs": 197
},
"system.environment": {
"id": "system.environment",
"category": "system",
"status": "ok",
"summary": "OS language C",
"details": {
"EDITOR": "set",
"LANG": "C.UTF-8",
"VISUAL": "not set",
"os": "Fedora 44.0.0 [64-bit]",
"os language": "C",
"os type": "Fedora",
"os version": "44.0.0"
},
"remediation": null,
"durationMs": 6
},
"terminal.env": {
"id": "terminal.env",
"category": "terminal",
"status": "ok",
"summary": "terminal metadata was detected",
"details": {
"COLORFGBG": "15;0",
"COLORTERM": "truecolor",
"DISPLAY": "present",
"WAYLAND_DISPLAY": "present",
"color output": "enabled",
"effective locale": "C.UTF-8",
"stderr is terminal": "true",
"stdin is terminal": "true",
"stdout is terminal": "true",
"terminal": "Konsole",
"terminal size": "238x52",
"terminal version": "260402"
},
"remediation": null,
"durationMs": 0
},
"terminal.title": {
"id": "terminal.title",
"category": "title",
"status": "ok",
"summary": "terminal title default",
"details": {
"terminal title activity": "true",
"terminal title items": "activity, project-name",
"terminal title project source": "git repo root",
"terminal title project value": "Auction",
"terminal title source": "default"
},
"remediation": null,
"durationMs": 0
},
"updates.status": {
"id": "updates.status",
"category": "updates",
"status": "ok",
"summary": "update configuration is locally consistent",
"details": {
"cached latest version": "0.142.0",
"check for update on startup": "true",
"last checked at": "2026-06-23T19:39:15.636817280Z",
"latest version": "0.142.0",
"latest version status": "current version is not older",
"npm update target": "/home/osama/.nvm/versions/node/v22.20.0/lib/node_modules/@openai/codex",
"update action": "npm install -g @openai/codex",
"version cache": "/home/osama/.codex/version.json"
},
"remediation": null,
"durationMs": 652
}
}
}What issue are you seeing?
Codex CLI starts normally and /status shows that my account is signed in, the model is selected, and usage limits are still available. However, when I send any prompt, even a simple hi, Codex fails with a 404 model-not-found error.
Current /status output:
>_ OpenAI Codex (v0.142.0)
Visit https://chatgpt.com/codex/settings/usage for up-to-date
information on rate limits and credits
Model: gpt-5.5 (reasoning xhigh, summaries auto)
Directory: ~/Desktop/Auction
Permissions: Workspace (Ask for approval)
Agents.md: AGENTS.md
Account: [redacted] (Plus)
Collaboration mode: Default
Session: 019ef5ff-2a2f-7231-ab78-27284dea9d27
5h limit: 99% left (resets 03:40 on 24 Jun)
Weekly limit: 47% left (resets 14:05 on 25 Jun)
When I send a simple prompt:
hi
I get this error:
⚠ Falling back from WebSockets to HTTPS transport. unexpected status 404 Not Found: Model not found gpt-5.5-codex-premium-1p-exp-p-0616-3a9cde-ev3-text-2-treatment
■ unexpected status 404 Not Found: Model not found gpt-5.5, url: https://chatgpt.com/backend-api/codex/responses, cf-ray: a105f849de9a8bd4-JED, request id: d2cc494e-09c0-4c1c-97ec-24f2cd6b827b
This looks like a backend/model-routing issue. /status shows gpt-5.5 as selected and my Plus usage limits are available, but the backend returns 404 Model not found when the request is sent.
The error also references what looks like an internal experiment/backend model name:
gpt-5.5-codex-premium-1p-exp-p-0616-3a9cde-ev3-text-2-treatment
This blocks Codex CLI completely because even a basic prompt fails.
### What steps can reproduce the bug?
## What steps can reproduce the bug?
Paste this:
```md
1. Open a terminal in my project directory:
```bash
cd ~/Desktop/Auction
codex
Check status:
/status
Confirm Codex shows:
Model: gpt-5.5
Account: Plus
5h limit: 99% left
Weekly limit: 47% left
Send a simple prompt:
hi
Codex falls back from WebSockets to HTTPS and then fails with:
unexpected status 404 Not Found: Model not found gpt-5.5
I also see the same issue when trying a normal task prompt such as:
Improve documentation in @filename
Thread/session id from /status:
019ef5ff-2a2f-7231-ab78-27284dea9d27
### What is the expected behavior?
## What is the expected behavior?
Paste this:
```md
Codex should successfully run the request using the selected `gpt-5.5` model.
Alternatively, if `gpt-5.5` is not available for my account, region, or current Codex configuration, the CLI should clearly show that before sending the request.
Expected behavior should be one of:
1. The request runs successfully using `gpt-5.5`.
2. Codex automatically routes to a valid available Codex model.
3. Codex shows a clear message that the selected model is unavailable and asks me to choose another model.
It should not show `gpt-5.5` as selected in `/status` while the backend later returns `404 Model not found`.
### Additional information
_No response_This issue has 2 comments on GitHub. Read the full discussion on GitHub ↗