Free ChatGPT API Alternative: GPT-Class Models, No Cost

If you just opened your OpenAI billing dashboard and winced, you are in the right place. DreamPrompting is a free ChatGPT API alternative that speaks the exact same protocol your code already uses. It is an OpenAI-compatible gateway that forwards your requests to the free tiers of many providers, with automatic failover, so you can keep shipping without a credit card attached.

The important part for developers: migrating is a one-line change. Because the endpoint mirrors the OpenAI Chat Completions API, you point your existing SDK at a new base_url, swap in a free API key from your account page, and keep everything else. No rewrite, no new client library, no credit card.

The honest tradeoff (read this first)

Let us be straight with you, because plenty of listicles are not. This does not hand you paid OpenAI models like GPT-4 for free. What it gives you is a free ChatGPT API alternative that serves GPT-class and open-weight models: Llama 3.3 70B, Google Gemini, DeepSeek, Qwen, Mistral, and GPT-OSS (open GPT-class weights). For a huge range of tasks (chatbots, summarization, extraction, drafting, agents, prototyping), these models are more than capable, and they cost you nothing.

The service is free under fair use, powered by the providers' own free tiers, with a rate limit of 100 requests per minute per IP and a rolling 24 hour account quota of 5,000 requests and 500,000 tokens. If your goal is a specific paid OpenAI model, this is not that. If your goal is a working, OpenAI-compatible free GPT API, this is exactly that.

Which models you actually get

• Groq serving Llama 3.3 70B, extremely fast inference.
• Google Gemini (for example google/gemini-3.1-flash-lite).
• NVIDIA NIM, OpenRouter, and Cohere for extra model variety.
• ch.at, a keyless provider, plus GPT-class open models like GPT-OSS.
• 24 providers configured in total, with automatic failover between them.

You can list what is live at any moment on the models page, or programmatically with GET /api/v1/models. Set "model": "auto" to let the gateway pick and fail over for you, or pin a specific one with the provider/model format like groq/openai/gpt-oss-120b.

Before and after: a one-line migration

Here is the code you probably have today, calling OpenAI directly.

# BEFORE (OpenAI, billed)
from openai import OpenAI

client = OpenAI(
    api_key="sk-your-real-openai-key",
)

resp = client.chat.completions.create(
    model="gpt-4",
    messages=[{"role": "user", "content": "Explain rate limiting in one sentence."}],
)
print(resp.choices[0].message.content)

Now the same code against this free ChatGPT API alternative. Only base_url, api_key, and the model name change.

# AFTER (DreamPrompting, free)
from openai import OpenAI

client = OpenAI(
    base_url="https://dreamprompting.com/api/v1",
    api_key="YOUR_API_KEY",  # free from /account
)

resp = client.chat.completions.create(
    model="auto",  # or "groq/openai/gpt-oss-120b"
    messages=[{"role": "user", "content": "Explain rate limiting in one sentence."}],
)
print(resp.choices[0].message.content)

That is the whole migration. Streaming works too: pass "stream": true and you get standard SSE chunks, exactly like the OpenAI API.

The curl version

Prefer a raw request? Two headers, and one of them is your free key.

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

Every endpoint expects that Bearer token, so keep it in an environment variable rather than pasting it into shared code. You can check your usage against both the per-minute limit and your account's daily quota with GET /api/v1/quota. Full details live in the API documentation.

Who this is for

• Developers hitting OpenAI billing on side projects and prototypes.
• Agent builders who need an OpenAI-compatible endpoint (see for agents).
• Anyone who wants to test prompts fast without setting up billing first. Try it live in the chat playground.

FAQ

Is this really free? Yes, under fair use. It is powered by the providers' own free tiers, with a limit of 100 requests per minute per IP and a rolling 24 hour account quota. The API key is free as well: sign in with Google and copy one, no credit card.

Can I use the OpenAI SDK? Yes. The endpoint is OpenAI-compatible, so the official OpenAI SDKs and most third-party OpenAI clients work by changing only the base URL and API key.

Is it the same as GPT-4? No, and we will not pretend otherwise. This is a free ChatGPT API alternative that serves GPT-class and open models (Llama, Gemini, DeepSeek, Qwen, Mistral, GPT-OSS), not paid OpenAI models. For most everyday tasks the quality is excellent, and the price is zero.

Start in under a minute

Grab a free key from your account page, point your existing code at https://dreamprompting.com/api/v1, and send a request. Read the API docs for streaming, model pinning, and quota, then browse the available models to pick the one that fits your workload. It is the fastest way to stop paying for what a free GPT API can already do.