OpenAI Models

OpenAI's lineup spans lightweight, high-volume models up to frontier reasoning systems. Through AI Gateway, every model below is reachable with the same OpenAI-compatible request format — one API key, one endpoint, per-token credit billing.

Available Models

Live per-model pricing is shown on the Models page — pricing is billed in credits per million tokens, so you always pay exactly what you use.

Quick Start

Python (OpenAI SDK)

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://your-domain.com/api/ai/v1"
)

response = client.chat.completions.create(
    model="gpt-5.5",
    messages=[
        {"role": "system", "content": "You are a senior software architect."},
        {"role": "user", "content": "Design a rate limiter for a public API."}
    ]
)
print(response.choices[0].message.content)

JavaScript / TypeScript

const client = new OpenAI({
  apiKey: "YOUR_API_KEY",
  baseURL: "https://your-domain.com/api/ai/v1",
});

const res = await client.chat.completions.create({
  model: "gpt-5.4-mini",
  messages: [{ role: "user", content: "Summarize this changelog." }],
});
console.log(res.choices[0].message.content);

cURL

curl https://your-domain.com/api/ai/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.5",
    "messages": [{"role": "user", "content": "Hello"}]
  }'

Replace your-domain.com with your AI Gateway site domain. Get your API key from the dashboard after sign-up.

Why Access OpenAI through AI Gateway

• One API key for every provider — mix OpenAI, Claude, Gemini, DeepSeek and more in one codebase
• OpenAI-compatible — keep your existing SDK, change only baseURL and apiKey
• Credit billing — top up once, spend on any model, credits never expire
• No subscription — pay per token, cancel anytime

Streaming

All chat models support SSE streaming. Set "stream": true in the request body — see the API docs for the full streaming example.

Related Pages

• Live model pricing — real-time credit prices for every model
• API reference — endpoints, parameters, streaming
• Pricing — credit packs

Why through AI Gateway

• One unified interface: call every provider through a single OpenAI-compatible base URL
• One key: no per-vendor accounts; credits are shared and never expire
• Per-token billing: cache hits billed at steep discounts
• Flexible switching: change one string to move between models or vendors

About this data

Specs and prices come from the platform live catalog; performance figures from vendor or third-party publications. Updated 2026-10-13.

Why through AI Gateway

• One unified interface: call every provider through a single OpenAI-compatible base URL
• One key: no per-vendor accounts; credits are shared and never expire
• Per-token billing: cache hits billed at steep discounts
• Flexible switching: change one string to move between models or vendors

Capabilities

15 shipping models, context windows from 400K to 1.05M tokens; tiers: flagship ×4, balanced ×3, previous generation ×2, light ×2, audio ×2, coding-focused ×1.

Pricing & billing

Per-token credit billing; cache hits at steep discounts. Live rates on the Models pricing page — numbers intentionally not fixed here.

FAQ

How large is the context window of OpenAI?

1,050,000 Token (1.05M)

How is it billed?

Per-token credit billing with cache-hit discounts. Live rates on the Models page.

Do I need a provider account?

No. One AI Gateway API key covers this model and every other model on the site.

About this data

Specs and prices come from the platform live catalog; performance figures from vendor or third-party publications. Updated 2026-10-13.