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OpenAI / Claude / Gemini
OpenAI Compatible

Low-cost AI API Gateway

Multi-Model Access · Low Pricing · OpenAI Format Compatible

API gateway for mainstream AI models, ideal for independent developers, AI tool users, and small teams for low-cost testing. Works with Cursor, Cline, ChatBox, NextChat, and any client supporting custom Base URLs.

From $14Claude Code readyBulk discount available

Credit Codes & Bulk Discounts

Buy a credit code for quick top-up, or contact support for a lower rate when you have larger recurring usage.

Recommended

Basic Credit Code

$14
Get $100 platform credit
For individual developers, AI client testing, and lightweight usage.
  • ✓Mainstream models available
  • ✓Self-service top-up in console
  • ✓Usage logs view
  • ✓Basic community support

Pro Credit Code

$42
Get $300 platform credit
For frequent usage, AI coding, multi-model testing, and small team usage.
  • ✓Mainstream models available
  • ✓Self-service top-up in console
  • ✓Usage statistics dashboard
  • ✓Peak-time priority routing
  • ✓1v1 Setup assistance

Bulk Subscription

Lower discount available
Custom
Bulk credit / recurring usage
For stable monthly usage, team usage, or larger Claude / Codex consumption.
  • ✓Lower rate for larger usage
  • ✓Monthly or one-time bulk credit
  • ✓Model and client setup assistance
  • ✓Manual quote based on usage

Supported Models

Supporting APIs from major providers. Actual availability, price multipliers, and status are shown in the console.

Available
AIOpenAI

OpenAI-format models

For text, coding, image generation, and OpenAI-compatible clients.

gpt-5.5gpt-image-2gpt-5.4gpt-5.4-minigpt-5.3-codexcodex-auto-review
Available
CClaude

Claude series models

For Claude Code, advanced coding, writing, and long-document analysis.

claude-opus-4-8claude-sonnet-4-6claude-opus-4-7claude-opus-4-6claude-haiku-4-5-20251001
Available
GGemini

Gemini series models

For long context, multimodal work, and cost-sensitive calls.

gemini-3.1-pro-highgemini-3.1-pro-lowgemini-3.1-pro-preview-customtoolsgemini-3.5-flashgemini-3.5-flash-low
* The model list and availability can adjust dynamically based on upstream status and cost factors.

3-minute setup, no detours

Buy credit, redeem it, create a key, then fill the right Base URL into your client.

Open Console
01

Buy credit

Choose a credit code or contact support for bulk discounts.

02

Redeem in console

Redeem the code to platform credit inside the console.

03

Create API Key

Create a key and select the models you want to allow.

04

Fill into client

Use /v1 for OpenAI-compatible clients; Claude Code uses a different base URL.

Most clients use one Base URL
https://api.cheng-zi-ai.com/v1

Claude Code / Codex setup

Different clients use different base URLs. Copy the matching setup below.

Claude Code

Claude Code configuration

Base URL
https://api.cheng-zi-ai.com
Token variable
ANTHROPIC_AUTH_TOKEN
Recommended model
claude-opus-4-8
Critical: Base URL has no /v1, use ANTHROPIC_AUTH_TOKEN, and remove ANTHROPIC_API_KEY if it was set before.
PowerShell temporary setup
$env:ANTHROPIC_AUTH_TOKEN="sk-your-api-key"
Remove-Item Env:ANTHROPIC_API_KEY -ErrorAction SilentlyContinue
$env:ANTHROPIC_BASE_URL="https://api.cheng-zi-ai.com"
$env:ANTHROPIC_MODEL="claude-opus-4-8"
$env:ANTHROPIC_DEFAULT_HAIKU_MODEL="claude-haiku-4-5-20251001"
$env:ANTHROPIC_DEFAULT_SONNET_MODEL="claude-sonnet-4-6"
$env:ANTHROPIC_DEFAULT_OPUS_MODEL="claude-opus-4-8"
$env:CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC="1"

claude -p "Reply with exactly: OK" --model claude-opus-4-8
%USERPROFILE%\.claude\settings.json
{
  "model": "claude-opus-4-8",
  "env": {
    "ANTHROPIC_BASE_URL": "https://api.cheng-zi-ai.com",
    "ANTHROPIC_AUTH_TOKEN": "sk-your-api-key",
    "ANTHROPIC_MODEL": "claude-opus-4-8",
    "ANTHROPIC_DEFAULT_HAIKU_MODEL": "claude-haiku-4-5-20251001",
    "ANTHROPIC_DEFAULT_SONNET_MODEL": "claude-sonnet-4-6",
    "ANTHROPIC_DEFAULT_OPUS_MODEL": "claude-opus-4-8",
    "CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC": "1"
  }
}
Codex

Codex configuration

Base URL
https://api.cheng-zi-ai.com/v1
Key variable
OPENAI_API_KEY
Recommended model
gpt-5.3-codex / codex-auto-review
Critical: Codex uses OpenAI-compatible routing, so the Base URL must include /v1.
PowerShell environment
$env:OPENAI_API_KEY="sk-your-api-key"
%USERPROFILE%\.codex\config.toml
model = "gpt-5.3-codex"
openai_base_url = "https://api.cheng-zi-ai.com/v1"
Tip: Claude Code uses Anthropic-compatible environment variables. Codex uses OpenAI-compatible routing.

FAQ

↗
Referral rewards
Invitee gets $10, inviter gets $3
1. Log in to console → Wallet.
2. Copy invite link and share.
New invited users get $10 credit; you get $3 after their first $100 top-up.
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