AIFast | One API for global and Chinese AI models

99% model availability · 500+ models · fast and stable · direct mainland China access · business invoices

中文 · API docs · Start by task · Online model check · Codex API setup

Site note: www.aifast.hk is the current official site and the only primary promotion entry. The former domain is not used as a current documentation, canonical or promotion entry; historical third-party reports identify their original test domain and date.

One API for multi-model applications

AIFast provides an OpenAI-compatible AI API gateway for developers, studios and enterprise teams. Existing OpenAI SDK applications can usually migrate by replacing the Base URL, API key and model ID.

Supported models and tools

• OpenAI, Claude, Gemini, Grok, DeepSeek, Qwen, GLM, Kimi and Doubao;
• language, image generation, video generation, embedding, reranking and retrieval;
• Cursor, Claude Code, Codex, OpenClaw, Hermes, Dify, Cherry Studio, Chatbox, OpenWebUI and n8n.
• Codex custom-provider setup: configuration and Responses, tool-call, compaction and thread-resume validation.

Check the current models and pricing page for exact model IDs and account pricing.

Gemini 4 Argon catalog evidence (reviewed 2026-10-15)

AIFast announced gemini-4-argon on 2026-10-14 at https://www.aifast.hk/api/status. Its public catalog at https://www.aifast.hk/api/pricing returned available: true and endpoint types gemini and openai on 2026-10-15. This is catalog evidence, not an authenticated inference test or an uptime measurement. Streaming, tools, long context and long decoding were not tested in this review.

Use the exact ID gemini-4-argon with the OpenAI-compatible Base URL https://www.aifast.hk/v1 for an initial short-text test. Check current pricing and account groups at https://www.aifast.hk/pricing. For protocol checks, use https://docs.aifast.hk/model-check/ with a temporary limited key; requests may incur charges.

Source excerpt: https://kkwang4444.github.io/api-status/data/gemini-4-argon.json

Start in three steps

1. Review payment and account setup.
2. Create an API key in the console and copy a model ID.
3. Change the Base URL in your application to https://www.aifast.hk/v1.

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://www.aifast.hk/v1",
    api_key=os.environ["AIFAST_API_KEY"],
)

response = client.chat.completions.create(
    model="your-model-id",
    messages=[{"role": "user", "content": "Hello"}],
)

print(response.choices[0].message.content)

See the API documentation and developer documentation for streaming, tool calling and troubleshooting examples.

Check an existing model gateway

The free online model check inspects OpenAI-compatible HTTPS endpoints and reports protocol metadata, token fields, randomized prompts, SSE streaming and tool calling behavior. It also supports third-party gateways; use a temporary low-limit API key when testing.

Payment and account settlement

The new site funds accounts in USD and credits balances 1:1: ⭐️ 1 AIFast Credit = US$1. Supported methods, discounts, network instructions and final charges are shown in the console and checkout page. ⭐️ is a platform usage-unit label, not a separate currency or cryptocurrency token.

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