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OhMyGPT

CodeX Support (5% pricing), Nano Banana, Parameter Overrides, and More

Thank you for using OhMyGPT. This update includes a native CodeX Responses endpoint (charged at 5% of GPT-5 list price), support for the Nano Banana model, a Public Beta of parameter overrides, and related pricing/UI notes.

1. CodeX Support (Responses API, 5% pricing)

We now provide a CodeX-compatible Responses API proxy. It behaves like the native service and is billed pay-as-you-go at 5% of GPT-5 standard pricing.

In light of recent alignment choices and “degradation” debates around Claude Code, our team evaluated alternative Coding Agent tools and services. We found that OpenAI CodeX + GPT-5 (reasoning effort: high) performs very well in practice, comparable to Claude Code + Opus 4.1, so we launched a corresponding proxy service.

This Coding API proxy was originally built to satisfy our internal Code Agent needs. Code agents often require broad permissions, including reading sensitive files and executing commands; any eavesdropping or prompt‑injection risk would be unacceptable. We therefore needed a trusted, controlled, and cost‑effective Coding API, which is why we maintain our own proxy.

Many of you have asked for a trusted, low‑cost Coding API. We have been operating since March 2023 and are grateful for the trust from many long‑time users. We’re making this service available to everyone at 5% of the model’s list price to cover maintenance costs. Feel free to use and share it.

Guide

1) Install CodeX

Install CodeX CLI:

npm install -g @openai/codex

2) Configure CodeX

Configure Config

Edit and overwrite ~/.codex/config.toml:



Configure APIKey


Edit ~/.codex/auth.json:




2. Nano Banana model support


We added support for vertex-gemini-2.5-flash-image-preview (aka Nano Banana), Google’s latest image‑generation capable model with strong image quality. Use via /v1/chat/completions:




By default, images are returned as Markdown + Base64, which can reduce client compatibility and produce verbose responses. To improve compatibility and reduce payload size, enable the built‑in conversion/upload:




3. Claude Code pricing update


Claude Code proxy pricing is adjusted from 10% to 5% of the official list price.


4. Parameter Overrides (Public Beta)


An experimental feature to override or remove fields in API request bodies based on rules, enabling advanced customization.


    

  • Entry: API Console → Parameter Overrides (/apis/overwrite-rules)
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  • Docs: Detailed documentation will be published later
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  • Note: This feature is in beta; please use with care and report issues. If you are unsure what you are doing, please do not enable it.
    • 



5. Other


Chat features are being refactored. File and image upload may not work temporarily. We will post a follow‑up announcement after completion.


For support, contact [email protected] or use the Feedback button in the top-right corner.


6. Payments


Added WeChat Pay (CNY) top-up channel. Invoicing is supported.
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