Every Other Interview Copilot Rents You AI. faFAANG Lets You Use the AI You Already Own.

How Most Interview Copilots Work

When you use Final Round AI, LockedIn AI, or most other tools in this category, here's what happens behind the scenes: your interview audio or prompt goes to their servers. Their backend formats the request and sends it to OpenAI (or another LLM provider) using their API key. The response comes back through their infrastructure and is delivered to you.

You're not paying for the AI directly. You're paying the copilot company, who pays OpenAI, who runs the model. Each intermediary adds a margin. The $75–$299/month you pay includes a markup on the AI compute cost — compute that, at retail OpenAI prices, costs a fraction of what you're being charged.

Argument 1: The Cost Math

If you already have a ChatGPT Plus subscription ($20/month), your marginal cost for faFAANG's AI responses during an interview is approximately zero above what you're already paying. faFAANG's pricing doesn't include any API compute cost because faFAANG doesn't pay for your compute. You do — through your existing ChatGPT subscription.

Here's the 6-month total cost comparison:

$169.99 vs $150–$540. And that $169.99 includes six months of ChatGPT Plus that you'd use anyway for daily work, coding assistance, and everything else. The faFAANG-specific cost is $49.99. Once. No renewal.

Argument 2: Data Routing

When you use a competitor's tool, your data takes this path:

Your interview audio, transcripts, prompts, and responses all pass through their infrastructure. They can log it, store it, use it for model training, or share it with third-party processors. You have no technical guarantee that they don't, because the data path includes their servers.

When you use faFAANG, your data takes this path:

The user logs into their own ChatGPT/Codex account within faFAANG. The CodexAppServerClient in faFAANG's main process spawns a child process that communicates via JSON-RPC over stdio. Requests route through your authenticated session to your ChatGPT account. faFAANG's servers are not in the data path.

The traffic is indistinguishable from using chat.openai.com directly. Same destination. Same authentication. Same data handling governed by your agreement with OpenAI — not with a third-party copilot company.

Argument 3: Model Currency

When competitors bundle their own AI backend, they lock you into whatever model version they've integrated. When OpenAI releases GPT-5, or a new version of o-series models, competitors need to update their backend, test the integration, and ship a new release. This takes weeks or months.

faFAANG users are on whatever model their own ChatGPT/Codex account has access to — immediately on release day. When OpenAI rolls out a new model, your faFAANG sessions use it as soon as your account has access.

faFAANG's Codex integration includes:

• ■Manual model selection — choose which model to use for each session
• ■Fetched model lists — dynamically pulls available models from your account
• ■Custom model ID input — specify any model ID your account supports
• ■Effort mode selection — control reasoning effort for speed vs. depth trade-offs
• ■Summary mode selection — control response verbosity

You control the model. Not faFAANG. Not a backend engineer at a copilot company who decides which model version you get access to.

Argument 4: No Vendor Lock-In

When you invest time setting up a competitor's tool — uploading your resume, career stories, configuring preferences — all of that lives on their platform. If they raise prices, degrade the product, or shut down, your setup is gone.

With faFAANG, every piece of your interview setup exists independently:

• ■Context files (resume, stories, JDs) are stored locally on disk in the Electron userData directory
• ■Shortcut preferences are stored in renderer localStorage on your machine
• ■Authentication is tied to your Supabase account, not a proprietary platform
• ■Your ChatGPT account exists independently and works for everything else you use it for

If faFAANG ceased operations tomorrow, every piece of your interview setup would still exist on your machine and in your own accounts. Your ChatGPT subscription keeps working. Your context files are regular files on your disk. Your shortcut preferences are in your browser's localStorage. Nothing is locked inside a platform you don't control.

The Architecture Comparison