Self-Hosting a Codex Proxy vs ProxyLLM: Total Cost of Ownership
A fair TCO comparison: VPS cost, setup hours, auth-refresh breakage, and queueing against a $129 flat fee. With the arithmetic, and the cases where DIY wins.
Self-hosting a Codex proxy costs about $10 a month in cash plus your hours; ProxyLLM costs $129 flat. Both run the same ChatGPT subscription underneath, so you are choosing an operator, not a discount. That makes the comparison simple to state honestly: price your time, estimate your maintenance hours, and the spreadsheet decides. At roughly 1.5 hours a month of upkeep, the breakeven lands near $80 an hour.
Here is the full accounting, fair to both columns.
What each side actually costs
The DIY stack: free software (ChatMock, codex-openai-proxy, or CLIProxyAPI), a small VPS, and your ChatGPT plan. The hosted stack: your ChatGPT plan plus our fee. The plan appears on both sides, so it cancels out of the comparison.
| Line item | DIY proxy | ProxyLLM Codex Hosted |
|---|---|---|
| Software | $0, open source | $129/mo flat, no markup |
| VPS (2 vCPU class) | $6 to $12/mo | Included |
| Initial setup | 3 to 6 hours | About 5 minutes (device sign-in) |
| Steady-state maintenance | ~1 to 2 hours/mo, averaged | None on your side |
| Upstream auth/CLI change | Your evening | We patch it |
| Multi-account fallback | Build or configure it | Included, ordered lanes |
| Queueing under concurrency | Build it | Included |
| Per-request logs | Build or bolt on | Included, shows serving lane |
| ChatGPT plan | Yours, $20 to $200/mo | Yours, $20 to $200/mo |
The maintenance row deserves honesty in both directions. A stable DIY box can hum untouched for months; the hours arrive in clusters, almost always when OpenAI ships a change to the Codex CLI or its sign-in flow and the proxy needs a patch and a redeploy. Averaged over a year, one to two hours a month is a fair planning figure for a production setup with monitoring; a hobby box you fix when you notice can run leaner.
The breakeven arithmetic
Take $10 a month of VPS and 1.5 hours a month of averaged maintenance:
DIY monthly cost = $10 + 1.5h × (your hourly rate)
Hosted monthly cost = $129
Breakeven rate = ($129 − $10) / 1.5 ≈ $79/hour| Your hourly rate | DIY true cost/mo | Hosted | Cheaper |
|---|---|---|---|
| $0 (hobby) | $10 | $129 | DIY |
| $50 | $85 | $129 | DIY |
| $80 | $130 | $129 | Even |
| $120 | $190 | $129 | Hosted |
| $200 | $310 | $129 | Hosted |
A $6 VPS is the cheapest line item in a DIY proxy; your hours are the expensive one. The table also omits incident cost on purpose, because it is workload-specific: an auth refresh that fails overnight takes your agents down until you wake up, and only you know what six dark hours cost your operation. If the answer is “nothing,” weight the DIY column up. If clients notice, weight it down.
What the $129 buys, concretely
For the fee, we run OpenAI’s official, unmodified Codex CLI in an isolated container that belongs to your account alone, signed in by you through OpenAI’s device-code flow; we never see your password and never pool accounts. Auth refresh, queueing, and upstream chasing are our pager, not yours. When a plan window exhausts, requests fail over to a second connected account, then your own API key, and the request log names the lane that served every call. The same terms posture applies to everyone in this category, DIY included: programmatic Codex is documented functionality, and OpenAI has the final call.
Where DIY genuinely wins
- Your time is genuinely free. Hobby projects, students, tinkering for its own sake: the arithmetic says DIY and the arithmetic is right.
- The no-third-party property is the point. Tokens and traffic stay on your hardware. A managed service cannot match that, ours included.
- You want lanes we do not run. CLIProxyAPI fronts several vendors’ CLIs; for the non-OpenAI lanes, self-hosting it is the honest answer, beside or instead of us.
- You are learning. Running one of these teaches you OAuth flows, process supervision, and OpenAI-compatible APIs better than any tutorial.
If you would rather run the plain Codex CLI on your own server with no proxy layer at all, that path has its own tradeoffs, covered in Codex Hosted vs running Codex yourself and the VPS setup guide.
The decision, compressed
Flat fees are easy to compare: $129 against however you price the hours you would spend operating the proxy yourself. Hobby and privacy-first setups should self-host with our genuine respect. Production endpoints that other people or paying clients depend on usually clear the $80/hour breakeven before the first incident.
Run your workload through the calculator to see what the subscription lane saves against your current API bill; the operator question is yours either way.
Frequently asked questions
How much does it cost to self-host a Codex proxy?
In cash, almost nothing: the software (ChatMock, codex-openai-proxy, CLIProxyAPI) is free and a small VPS runs $6 to $12 a month. The real cost is hours: a few for setup, then ongoing maintenance that clusters whenever OpenAI changes the Codex CLI or its sign-in flow.
Is self-hosting a Codex proxy cheaper than ProxyLLM?
In cash, always: roughly $10 a month against $129. In total cost of ownership it depends on your hourly rate. At about 1.5 maintenance hours a month, the breakeven is roughly $80 an hour; below that DIY wins on arithmetic, above it the fee is cheaper than your time.
What breaks most often in DIY Codex proxies?
Authentication. Sessions expire and refresh flows change when OpenAI updates the Codex CLI or its protocol. Proxies that re-implement the client break on protocol changes; proxies that wrap the CLI break on flag and output changes. Both get patched by maintainers, but your endpoint is down until the patch lands and you deploy it.
Is there a hosted alternative to CLIProxyAPI?
For the OpenAI/Codex lane, yes: ProxyLLM's Codex Hosted runs OpenAI's official Codex CLI signed in with your own ChatGPT account, managed for $129 a month with fallback lanes and per-request logs. CLIProxyAPI covers additional vendors' CLIs, so if you need those lanes self-hosted, the honest answer is to run it, or run both together.