World-class language models are now free to call — no card, no commitment. The problem is choosing among a dozen providers with very different limits, speeds, and strengths. Below is a tested comparison of 10 free AI APIs, plus a use-case cheat sheet and a copy-paste code pattern that works across all of them.

What we measured, ranked

Rather than repeat vendor claims, we called every one of these APIs ourselves from the same US machine with the same prompt, timing generation from each API's own token counts. Measured 2026-08-31 with our open benchmark:

Three things the marketing pages won't tell you

1. Groq is not slightly faster — it's 3× the next one. 527 tok/s against Mistral's 167, and 26× the slowest we measured. If generation speed matters at all, the decision is basically made.

2. Gemini takes 34 seconds to say its first word. Its models now reason internally before responding. Generation is quick once it starts, but half a minute of silence rules it out for anything interactive. See our Gemini measurements.

3. Four of the ten no longer have a usable free tier. SambaNova, Together and Cerebras now demand a card; GitHub Models returns 410. Lists that still recommend them — including ours before we retested — are out of date. This is the single biggest change in free AI APIs during 2026.

One oddity worth noting: OpenRouter served NVIDIA's own model faster than NVIDIA did (38 vs 33 tok/s on identical weights). Free capacity is shared and unevenly provisioned, so the first-party endpoint isn't automatically the best route to a model.

Full method, raw numbers and dated history: free AI APIs benchmarked.

The Standouts, in One Line Each

• Google Gemini (aistudio.google.com) — frontier-class Gemini 2.5 Pro with a ~1M-token context that handles text, images, audio, and video. The best all-round free model for document and multimodal work.
• Groq (console.groq.com) — LPU hardware streams ~300–800 tokens/sec, roughly 10–30x a typical GPU API. Unbeatable for voice assistants and interactive chat.
• Cerebras (cloud.cerebras.ai) — wafer-scale chips hit ~2,100 tokens/sec, the fastest anywhere. Still under the radar, so the free tier is generous.
• DeepSeek (platform.deepseek.com) — R1 rivals OpenAI o1 on math/coding benchmarks, OpenAI-compatible, near-free. Best for algorithmic and reasoning tasks.
• OpenRouter (openrouter.ai) — one key, 300+ models, dozens labeled :free. Switch models by editing a single string.
• Mistral AI (console.mistral.ai) — high quality-per-parameter and strong across 12+ languages. Good for European/multilingual apps.
• Cloudflare Workers AI (docs) — inference at the edge in 300+ locations, plus Flux image gen and speech, with zero server management.
• GitHub Models — retired on 2026-07-30. The playground, model catalog, inference API and BYOK were all shut down; the endpoint now returns HTTP 410. It was the only free tier that served GPT-4o, and nothing has replaced that. See what to migrate to.
• NVIDIA NIM (build.nvidia.com) — 1,000 free req/month, including domain models for chemistry and biology.
• Alibaba Bailian / Qwen (console) — ~2M free tokens on signup and excellent Chinese/Japanese/Korean handling.

One Code Pattern for (Almost) All of Them

Most of these APIs are OpenAI-compatible, so switching providers means changing the base_url and model name — nothing else. DeepSeek, OpenRouter, NVIDIA NIM, GitHub Models, and Alibaba all follow this shape:

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_KEY",
    base_url="https://openrouter.ai/api/v1",   # swap per provider
)
response = client.chat.completions.create(
    model="openrouter/free",
    messages=[{"role": "user", "content": "What is the capital of France?"}],
)
print(response.choices[0].message.content)

Gemini and Groq ship their own SDKs (pip install google-genai / pip install groq) but the call shape is nearly identical. Cloudflare runs inside a Worker via env.AI.run(...).

Which Free AI API Should You Use?

Mix Providers in One Agent

The best free stack isn't one API — it's several, routed by task. A common pattern: Groq for the fast chat interface, Gemini for long-document parsing, DeepSeek R1 for code generation, and Cloudflare Workers AI for image generation. Because the call shape is shared, an orchestrator like OpenClaw lets you set a custom base URL and key per tool and blend providers without paying anything.

Frequently Asked Questions

Do any of these require a credit card?

Most do not. Gemini, Groq, Cerebras, and Cloudflare Workers AI offer free access with no card. DeepSeek and Mistral may ask for one at higher tiers but give free quota on signup.

Can I use multiple free APIs in one app?

Yes, and you should — route each task to the best model for it. Because these APIs share OpenAI-compatible syntax, switching is usually just a new base_url.

Which has the best limits for light production?

Mistral, Alibaba Bailian, and Gemini Flash tend to have the most practical everyday limits — but confirm current numbers on each dashboard, since some have moved them behind a login.

Related Reads

• Together AI Free Tier Is Gone: What It Costs Now — the only free API covering chat, reasoning, vision, and image generation on one key
• Groq vs Cerebras vs Gemini: Free AI API Speed Test — head-to-head speed benchmarks
• Cohere Free API: Embedding and Rerank for RAG — pair with any chat API for a complete free RAG stack
• OpenRouter Free Tier Tested: 18 Free Models, One API Key — when model variety matters more than provider lock-in