Free AI API in 2026: Every Free Tier for Developers (Gemini, Groq, Cerebras and More)

You can build with a free AI API in 2026 without paying a cent: Google's Gemini API, Groq, Cerebras and Mistral all have free tiers for testing, Cerebras gives 1 million free tokens a day, OpenRouter offers free models through one API, and Cloudflare Workers AI includes 10,000 Neurons of free inference every day. For hosting and storage around your app, Modal gives $30 of free compute every month, and Qdrant and Pinecone have free vector databases.

Quick answer: start with the Gemini API free tier or Groq for a chatbot prototype, add OpenRouter if you want to compare many models through one key, and keep Cerebras in mind when you need a lot of free tokens. None of the free tiers are meant for production traffic, so plan to pay once real users arrive.

Free AI API tiers compared (October 2026)

All of these let you start without a credit card. Limits change often, so check each provider's page before you design around a number.

Gemini API: the easiest free LLM API to start with

The Gemini API free tier covers several of Google's fast models, including Flash and Flash-Lite, plus Live and text-to-speech models, with free input and output tokens. For most prototypes, chatbots and classroom projects, that's enough.

The important fine print: on the free tier, Google may use what you send to improve its products. Don't send customer data or anything confidential until you switch to the paid tier, which doesn't have that condition. See the Gemini API tool page for the latest deals.

Groq and Cerebras: free and very fast

Groq runs open models on its own chips, and responses come back unusually quickly. The free tier needs no credit card; adding a payment method moves you to a Developer tier with higher limits. Its API is compatible with the OpenAI SDK, so you can usually switch by changing the base URL.

Cerebras is the other speed specialist. Its free tier includes 1 million tokens a day, one of the most generous daily allowances available. If your app makes many small calls, Cerebras' daily budget goes a long way.

OpenRouter: many free models behind one key

OpenRouter gives you a single API for hundreds of models from different providers, and some of them are free. Free models allow 20 requests a minute and 50 a day. If you buy at least $10 of credits (which don't expire), the free-model limit rises to 1,000 requests a day. That $10 is the best-value upgrade in this list if you're testing seriously.

Mistral, Cloudflare and Cohere

• Mistral AI has a free Experiment plan with API access on by default and no card needed.
• Cloudflare Workers AI gives every account 10,000 Neurons of inference a day on open models, on both free and paid plans. On the free plan you simply stop at the daily limit.
• Cohere creates a trial API key for every new account: 1,000 calls a month, with limits per endpoint such as 20 chat requests a minute. It's handy for testing Cohere's embeddings and reranker, but trial keys can't be used in production.

Free tools around the API: compute, vectors and tracing

A real AI app needs more than a model. These free tiers cover the rest of a small stack:

• Modal: $30 of GPU and CPU compute every month on the Starter plan, with no monthly fee. Great for running open models, batch jobs or fine-tuning experiments.
• Pinecone: a free Starter plan with 2 GB of storage and up to 5 indexes for RAG and search.
• Qdrant Cloud: a free 1 GB cluster with no time limit (it's suspended after a week without use).
• LangSmith: free tracing of up to 5,000 runs a month, so you can see what your agent actually did.
• Google Colab: free notebooks with GPU and TPU access, subject to availability.

Free credits for students and startups

If you qualify, these are worth far more than any free tier:

• Azure for Students: $100 of credit with no credit card, usable for Azure OpenAI.
• Google Cloud: $300 of credit for new customers, which also works for Gemini on Vertex AI.
• Together AI Startup Accelerator: $15,000 to $50,000 in credits for AI startups, depending on funding stage.
• fal Startup Program: $1,000 in generative media credits, growing to $5,000 as you scale.

How to stay on free tiers longer

1. Cache answers. Don't send the same prompt twice; store results.
2. Use the smallest model that works. Flash-class and small open models are often free or nearly free.
3. Spread load across providers. Most SDKs speak the OpenAI format, so switching between Groq, Cerebras and OpenRouter is a config change.
4. Set spend limits the moment you add a card. Most consoles let you cap monthly spending.
5. Read the data policy. Free tiers sometimes allow training on your inputs; paid tiers usually don't.

Common mistakes with free AI APIs

• Shipping a product on a free tier. Free limits can change without notice, and rate limits will break your app the day it gets popular.
• Sending private data to a free tier whose terms allow the provider to use your inputs.
• Leaking API keys. Never put keys in front-end code or public repositories; keep them on a server.
• Forgetting spend limits after adding a card to unlock higher tiers.

Which free AI API should you choose?

• First chatbot or class project: Gemini API free tier.
• Speed matters: Groq or Cerebras.
• Comparing many models: OpenRouter (and its $10 credit upgrade).
• Running your own model: Modal's $30 a month of compute.
• Building RAG: Pinecone or Qdrant for vectors, plus LangSmith to debug.

When your app gets real users, compare paid prices before committing. We track new developer credits and free tiers in our API & cloud deals.

Sources: Gemini API pricing; Groq billing FAQs; Cerebras rate limits; OpenRouter limits; Cloudflare Workers AI pricing; Cohere rate limits; Modal pricing; Qdrant pricing; LangSmith pricing; checked in October 2026.