Top Free LLM APIs in 2026: Rate Limits, Keys & Verified Endpoints

Overview

For developers seeking zero-cost LLM access in 2026, Google AI Studio offers the most generous free tier at 15 RPM with 1M tokens/day on Gemini 2.5 Flash. Groq provides 30 RPM / 14,400 RPD on Llama 3.3 70B with no credit card required and 800 tokens/second latency. Cerebras delivers 450+ tok/s on wafer-scale hardware. Kilo Gateway provides 100% free access to MiMo V2.5 and Ling 3.0 Flash through its code platform integration. Each serves different needs: Google for long-context tasks, Groq for speed, Cerebras for throughput, and Kilo for frontier model access.

Quick verdict: Google AI Studio leads with the most generous free tier (15 RPM, 1M tokens/day, no card). Groq leads for speed (800 tok/s, 30 RPM, no card). Kilo Gateway leads for frontier model access (MiMo V2.5, Ling 3.0 Flash, 100% free).

Verified Rate Limits

The table below compares real-time verified rate limits across the top free-tier providers. All data points were tested against official API endpoints. Google AI Studio provides 15 RPM / 1,500 RPD on Gemini 2.5 Flash — no credit card required. Groq offers 30 RPM / 14,400 RPD on Llama 3.3 70B with the fastest inference speeds. Cerebras provides a verified developer tier with daily free quotas. The key differentiator is that Google and Groq require no payment method at all, while Cerebras requires email verification but no credit card.

SDK Integration

All top free-tier providers offer OpenAI-compatible APIs, enabling drop-in replacement of the standard OpenAI SDK client. Simply change the baseURL and apiKey environment variable. Groq's API at https://api.groq.com/openai/v1 supports the exact same chat.completions.create interface. Google AI Studio at https://generativelanguage.googleapis.com/v1beta uses a slightly different message format but maintains compatible response structures. This means migrating from OpenAI to any free provider requires changing only 2-3 lines of code.

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.groq.com/openai/v1",
  apiKey: process.env.GROQ_API_KEY,
});

const response = await client.chat.completions.create({
  model: "llama-3-3-70b",
  messages: [{"role": "user", "content": "Hello"}],
});

import { GoogleGenerativeAI } from "@google/generative-ai";

const genAI = new GoogleGenerativeAI(process.env.GOOGLE_API_KEY!);
const model = genAI.getGenerativeModel({ model: "gemini-2.5-flash" });
const result = await model.generateContent("Hello");

Privacy Policies

Privacy is a critical concern for free-tier LLM APIs. Google AI Studio's terms state that user inputs may be used for training purposes unless you explicitly opt out in the API console settings. Groq does not train on user inputs and processes all requests through ephemeral LPU instances. Cerebras similarly does not retain prompts post-inference. Kilo Gateway aggregates multiple backends — the privacy policy depends on the specific provider handling your request. For production-sensitive applications, always verify the current privacy policy before deployment.

FAQ

Q: Which free LLM API requires no credit card? A: Google AI Studio, Groq, and Kilo Gateway all allow usage without attaching a payment method. Q: Can I use free LLM APIs for production? A: Free tiers are designed for development and prototyping. Rate limits (20-30 RPM) are too restrictive for production workloads. Consider paid tiers or self-hosting for production traffic. Q: What is the fastest free LLM API? A: Groq delivers 800 tokens/second on Llama 3.3 70B, making it the fastest free option. Cerebras follows at 450+ tok/s on wafer-scale hardware.