Best Gateways for an OpenAI / ChatGPT API Key

Quick answer: Get an OpenAI/ChatGPT API key at platform.openai.com → API keys. To reach GPT-5.5 and GPT-5.4 through one OpenAI-compatible key (often ~20–40% cheaper on select models), the best gateways in 2026 are Novarelay, OpenRouter, CometAPI and AiHubMix. Updated July 2026.

How to get an OpenAI API key (ChatGPT / GPT-5.5)

To create an OpenAI API key directly, sign in at platform.openai.com, open API keys and generate a new secret key (your OPENAI_API_KEY). Add billing, then call the ChatGPT API with the GPT-5.5 API, the faster GPT-5.4, or the GPT-Image-2 model for images. As of July 2026, GPT-5.5 costs $5 per 1M input tokens and $30 per 1M output tokens, with cached input at $0.50; GPT-5.4 is priced lower for high-volume workloads.

Get the same GPT models cheaper through a gateway

An AI API gateway gives you one OpenAI-compatible open api key that reaches GPT-5.5 and GPT-5.4 (plus Claude and Gemini) without juggling separate accounts. Because a gateway resells the same models, your code keeps using the OpenAI SDK — you only swap the base URL and the key. Our top pick, Novarelay, exposes GPT-5.5 and GPT-5.4 through a single key at up to 20% below OpenAI’s direct pricing, with pay-as-you-go credits from $1 and a usage dashboard.

Is the GPT-5.5 API expensive?

GPT-5.5 costs $5 per 1M input tokens and $30 per 1M output tokens. Cached input ($0.50) and batch mode (about 50% off) reduce the effective OpenAI API cost, and a discount gateway can lower it further on the same model.

What is the difference between GPT-5.5 and GPT-5.4?

GPT-5.5 is the flagship with the highest quality; GPT-5.4 is priced lower and is a good default for high-volume ChatGPT API workloads. Both are reachable with one OpenAI API key or one gateway key.

Can I use my existing OpenAI SDK with a gateway?

Yes. A gateway with an OpenAI-compatible endpoint is a drop-in: point the OpenAI SDK at the gateway base URL and paste the gateway key in place of your openai_api_key.

Is it safe to use an AI API gateway?

A gateway is a paid reseller that routes your request to the official model and bills you per token. The things worth checking are reliability, data handling and billing — here is how we think about each, and what our ranking weighs most.

Will my key suddenly stop working?

The real risk with any reseller is downtime or a service disappearing, so reliability and uptime carry heavy weight in our ranking. We favour gateways with a public status page and pay-as-you-go credits (no lock-in). For production, pin exact model slugs and keep a fallback key with a second provider or the official API.

Do gateways log or train on my prompts?

Data handling is set by each provider’s own privacy policy, not by us — always read it before sending sensitive data. The better gateways pass requests straight through to the model provider and do not retain prompt content; we treat clear, privacy-respecting terms as a plus and vague ones as a minus.

Why is it cheaper than going direct — is the discount real?

Gateways buy at volume and route efficiently, then pass part of the saving on; the discount is a real per-token rate, not a coupon. Always confirm the live price in the provider’s dashboard before you build — pricing is set by each provider and can change, and we show figures for comparison only.

Do I need a credit card to start?

Most gateways are pay-as-you-go: top up a small amount, spend it across models, no subscription. Some include a little trial credit so you can test before you commit. Start small, verify quality and latency on your own workload, then scale.

Last updated: July 2026 · Independent ranking; we may be rewarded for recommending the service we rate best (never for placement). Model names and trademarks (OpenAI, ChatGPT, GPT, Anthropic, Claude, Google, Gemini) belong to their respective owners and are used for identification only. Pricing is set by each provider and can change — always verify before you build.