Best Free AI APIs in 2025 With No Credit Card Required

The Friction Wall Every Developer Hits

You want to test an AI API. You find the documentation. You go to sign up. Then comes the wall: "Enter your credit card to continue." For a developer who just wants to evaluate a model, this is a deal-breaker. You are not ready to pay. You do not know if this API is even what you need. You should not have to commit.

The good news: in 2025, there are more genuine no-credit-card AI API options than ever before. This is the definitive list — tested, ranked, with honest notes on what each one actually gives you.

Tier 1: Truly Free, No Credit Card, Works Right Now

1. FreeLLMKeys

Models: GPT-4o, Claude Opus 4, Gemini 2.5 Flash, DeepSeek V3, Grok-4, Mistral, Llama 4, and 80+ more
Rate limit: 3–20 RPM per key
Credit card: Not required — no account at all
OpenAI-compatible: Yes — base URL: https://aiapiv2.pekpik.com/v1
Key expiry: 24–48 hours
Best for: Testing any frontier model, prototyping, students, indie developers

from openai import OpenAI

# Works immediately — no account, no card
client = OpenAI(
    base_url="https://aiapiv2.pekpik.com/v1",
    api_key="sk-copy-from-freellmkeys-dot-com"
)

response = client.chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Hello!"}]
)
print(response.choices[0].message.content)

2. Google AI Studio

Models: Gemini 2.5 Flash, Gemini 2.5 Pro
Rate limit: 15 RPM, 1,500 RPD
Credit card: Not required — Google account required
OpenAI-compatible: Via compatibility endpoint
Key expiry: Never (permanent key)
Best for: Gemini-specific development, long-context tasks

3. Groq

Models: Llama 4, Mixtral, Gemma
Rate limit: ~30 RPM
Credit card: Not required — email signup required
OpenAI-compatible: Yes — https://api.groq.com/openai/v1
Key expiry: Never
Best for: Speed-sensitive applications — Groq's LPU delivers 800+ tokens/sec

4. OpenRouter (Free Model Tier)

Models: Llama 4, Gemma 3, Mistral 7B, Phi-3 (all free permanently)
Rate limit: Varies by model
Credit card: Not required for free models
OpenAI-compatible: Yes — https://openrouter.ai/api/v1
Best for: One API for many open-weight models

5. Mistral AI (La Plateforme)

Models: Mistral 7B, Codestral
Rate limit: Limited free tier
Credit card: Not required for trial
OpenAI-compatible: Yes — https://api.mistral.ai/v1
Best for: European developers needing EU-hosted AI

Tier 2: Free with Signup, No Card

6. Cohere

Trial API key with 1000 calls, no card. Good for embeddings and RAG.

7. Together AI

$1 free credit on signup, no card. Many open-weight models.

8. Hugging Face Inference API

Free tier for smaller models. No card. Excellent for open-source model access.

How to Use Multiple Free APIs Without Rewriting Code

The beauty of OpenAI-compatible APIs: switching between them is one line of code.

from openai import OpenAI

# Dictionary of free API options — switch by changing one variable
FREE_APIS = {
    "freellmkeys": {
        "base_url": "https://aiapiv2.pekpik.com/v1",
        "api_key": "sk-your-freellmkeys-key",
        "model": "gpt-4o"
    },
    "groq": {
        "base_url": "https://api.groq.com/openai/v1",
        "api_key": "gsk-your-groq-key",
        "model": "llama-4-scout-17b-16e-instruct"
    },
    "openrouter": {
        "base_url": "https://openrouter.ai/api/v1",
        "api_key": "sk-or-your-openrouter-key",
        "model": "meta-llama/llama-4-maverick"
    }
}

def call_free_api(prompt: str, provider: str = "freellmkeys") -> str:
    config = FREE_APIS[provider]
    client = OpenAI(base_url=config["base_url"], api_key=config["api_key"])
    response = client.chat.completions.create(
        model=config["model"],
        messages=[{"role": "user", "content": prompt}]
    )
    return response.choices[0].message.content

# Test all three free providers with one function
for provider in FREE_APIS:
    print(f"\n=== {provider} ===")
    print(call_free_api("Name one advantage of Python for beginners.", provider))

Which Should You Start With?

If you want to start in under 2 minutes with no account: FreeLLMKeys — copy a key, run the code above.
If you want a permanent key with higher daily limits: Google AI Studio (free Gemini key).
If speed is your priority: Groq after a quick email signup.
If you want the widest model selection on one key: FreeLLMKeys or OpenRouter.

Start with FreeLLMKeys. You will be making API calls in under five minutes.