Best Free LLM APIs for Developers (2026)

You want to build an AI app. But paid API bills scare you.

So Good news in 2026, you can build a lot for free. Several providers give free access to strong models. No card needed for most of them.

There is a catch. Every free tier has limits, and the limits change often. This guide shows the real numbers, the catches, and working code.

Last checked: October 2026. Free tiers change fast, so always confirm in the provider's console.

1. Google Gemini API (AI Studio)

Google AI Studio is free to use. The Gemini API also has a free tier that needs no billing setup.

Many Flash and Flash-Lite models are free of charge. There is also a free embedding model, which is handy for RAG.

The catch: Google no longer publishes per-model limits in its docs. You must check them in the AI Studio console. Also, free-tier requests may be used to improve Google products. Do not send private data.

2. Groq

Groq is known for speed. Sign up at console.groq.com. No credit card is required.

Sample free limits for openai/gpt-oss-120b:

- 30 requests per minute

- 1,000 requests per day

- 8,000 tokens per minute

- 200,000 tokens per day

The catch: Limits apply to your whole organization, not each key. Extra keys will not give you more.

3. OpenRouter

OpenRouter gives one API for many models. Models with an ID ending in :free cost nothing per token.

The limit is 20 requests per minute. You also get 50 requests per day. After you buy $10 of credits (once, lifetime), the daily limit rises to 1,000.

Best for: comparing models without making ten accounts.

4. Cloudflare Workers AI

You get 10,000 Neurons per day for free. It resets daily at 00:00 UTC.

Neurons are Cloudflare's unit of compute. The pool is shared across all models. Big models use it up much faster than small ones.

Best for: small apps already running on Cloudflare Workers.

5. Mistral and Cohere

Both give free access without billing.

- Mistral: Free mode is the default. It is meant for testing. See your exact limits on the Limits page in the console.

- Cohere: Every new account gets a Trial API key. Good for embeddings and reranking experiments.

Not Really Free

Some "free" offers are not what they look like:

- Cerebras: gives $5 credit, but only after you add a payment method. The credit expires in 30 days.

- Together AI, xAI, Anthropic, DeepSeek: no free API tier at the time of checking.

One Python Snippet for Many Providers

Most of these APIs are OpenAI-compatible. So you can switch providers by changing two lines.

import os

from openai import OpenAI

client = OpenAI(

base_url="https://api.groq.com/openai/v1",

api_key=os.environ["GROQ_API_KEY"],

)

resp = client.chat.completions.create(

model="openai/gpt-oss-120b",

messages=[{"role": "user", "content": "Explain RAG in one line."}],

)

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

To use OpenRouter, change base_url to https://openrouter.ai/api/v1. Then use a model ID that ends in :free.

Handle Rate Limits (429 Errors)

You will hit limits. Plan for it.

import time

def ask(prompt, retries=3):

for i in range(retries):

try:

r = client.chat.completions.create(

model="openai/gpt-oss-120b",

messages=[{"role": "user", "content": prompt}],

)

return r.choices[0].message.content

except Exception:

time.sleep(2 ** i) # wait 1s, 2s, 4s

return "Rate limited. Try again later."

Tips to Stay Inside Free Limits

- Cache answers: Do not call the API twice for the same prompt.

- Keep prompts short: Tokens per minute run out fast.

- Use a small model first: Switch to a big one only when needed.

- Do not send private data to free tiers: Many may use your data to improve their products.

- Check limits monthly: Providers change them without warning.

Which One Should You Pick?

- Just starting: Gemini API. No billing, and it has a free embedding model.

- Need speed: Groq.

- Want to compare models: OpenRouter.

- Building on Cloudflare: Workers AI.

- Building a chatbot over your documents: Pair any of these with ChromaDB. Here is our step-by-step RAG chatbot guide.

Conclusion

Free LLM APIs are good enough to build real prototypes. Start with Gemini or Groq, keep your code OpenAI-compatible, and handle 429 errors from day one.

When your app grows, move to a paid plan. Since you used a standard format, switching will take minutes. Curious about a different kind of model? Read what a System One model like Jev does.

FAQ

- Is there a free LLM API with no credit card?

Yes. Groq needs no card. Gemini API's free tier needs no billing. Mistral and Cohere also have free access without billing.

- Can I use a free LLM API in production?

Not safely. Limits are small and can change anytime. Use free tiers to prototype, then price your real workload on paid rates.

- Which free LLM API is the fastest?

Groq is known for low latency. Test with your own prompts to be sure.

- Do free APIs keep my data?

It depends on the provider. Google says free-tier requests may be used to improve its products. Read each provider's data policy first.

- Are the limits the same for everyone?

No. Limits can vary by account, model, and region. Always check your own console.