Tool Suggestions
Best Free AI APIs With an API Key and No Credit Card in 2026
Every developer building with AI asks the same question sooner or later: which API can I call for free, with just an API key, without handing over a credit card? The honest answer starts with a distinction, because "free" means three different things. Some providers run a permanent free tier with published rate limits. Some hand out one-time starter credits that expire. And some advertise a free trial that quietly requires a card. This article covers only the first kind — tiers you can sign up for and call today, with no card on file — and compares them on the quotas that actually decide whether your project fits.
The free tiers, with real numbers
Google Gemini API has the most generous free tier overall. Its Flash models and selected Pro models are free of charge, with no card required — you add billing only when you choose a paid tier. The catch is that Google no longer publishes free-tier rate limits publicly; they appear only inside AI Studio once you sign in. Reported figures for Flash models run to around 1,500 requests a day, but your own console is the final word.
Groq is the best choice when you need published, predictable limits and raw speed. Its free plan allows 30 requests a minute and 1,000 requests a day on its main chat models, with 8,000 tokens a minute and a 200,000-token daily budget on gpt-oss-120b. Inference runs at hundreds of tokens a second, which makes it the natural pick for latency-sensitive prototypes.
OpenRouter gives you the widest model choice behind one key. Its free models — marked :free — allow 20 requests a minute and 50 requests a day, rising to 1,000 a day once you have bought $10 of credits at any point. Every model speaks the OpenAI chat format, so one client covers them all.
Mistral's free tier covers its Large, Medium, Small, Codestral and Devstral models with no card required, with usage limits shown in your admin panel. Cloudflare Workers AI includes 10,000 Neurons a day on the free plan — enough for roughly 147,000 output tokens on gpt-oss-120b — and suits anyone already running on Cloudflare. SambaNova Cloud allows 20 requests a minute, 20 requests a day and 200,000 tokens a day per model. Cohere's trial key gives about 1,000 calls a month across its chat, rerank and embed models, for development and evaluation. GitHub Models offers 15 requests a minute and 150 to 1,000 requests a day across GPT, Claude, Llama and Phi models, aimed at experimentation. NVIDIA's API catalog provides free prototyping access at around 40 requests a minute across DeepSeek, Llama, Nemotron and Gemma models.
Which one fits what
If you want the strongest free models and do not mind limits you can only see after signing in, start with Gemini. If you need limits you can plan against in advance, Groq is the better choice. If you want to compare many models behind one endpoint, OpenRouter is the one. If your app already runs on Cloudflare, Workers AI is the path of least resistance. And if your prompts contain customer or confidential data, none of these free tiers is the right answer — free-tier prompts may be used to improve the provider's products, so keep free tiers for public or synthetic test data and move to a paid tier for anything sensitive.
The stacking trick
The practical way to get more free capacity is to use several tiers side by side. Each provider counts its limits separately, so routing simple requests to Gemini's free tier, fast requests to Groq's and fallback traffic to OpenRouter's free models multiplies what you can do for $0. A small gateway such as OpenRouter itself or LiteLLM handles the fallback when one provider answers with a rate-limit error. Free tiers only carry very small scale — Gemini's daily allowance covers roughly 500 conversations — so the moment your app grows past a prototype, the upgrade path matters: check the paid price per million tokens before you build, not after.
The honest limits
Free tiers change often, and the roundups that rank them go stale fast. The clearest recent example is Cerebras, which used to lead with a million free tokens a day and became a card-required trial in July 2026 — which is why it is not on this list. Quotas also differ between sources for the same provider, and a provider's own console beats any article, including this one. One more terms trap: Gemini's terms allow only paid services for apps offered in the European Economic Area, Switzerland or the UK, so you can test on free quota there but the launched app needs billing. Check the provider's pricing page on the day you build, and treat every number above as the October 2026 position, not a promise.