AI APIs with Free Tiers in 2026: The Complete Guide
Every AI inference API with a free tier — LLMs, image gen, video, and audio. Start building without a credit card using Groq, Cloudflare, Together AI, DeepInfra, and more.
You don’t need a budget to start building with AI APIs. Many inference providers offer free tiers with enough credits to prototype, test, and even run small production workloads.
Here’s every provider with a free tier, what you get, and when you’ll need to upgrade.
LLM providers with free tiers
Groq
- What’s free: Rate-limited access to all models including Llama, Mistral, and Gemma
- Limits: Requests per minute and tokens per day caps
- Best for: Testing fast inference, building chatbot prototypes
- Upgrade trigger: Hitting rate limits on production traffic
Together AI
- What’s free: Free credits on signup
- Limits: Credit balance (one-time, not recurring)
- Best for: Trying open-source models before committing
- Upgrade trigger: Credits run out
DeepInfra
- What’s free: Free tier with rate limits
- Best for: Running affordable open-source LLMs
- Upgrade trigger: Need higher throughput
Cloudflare Workers AI
- What’s free: Generous free allocation within Workers free tier
- Best for: Edge AI applications, global low-latency inference
- Upgrade trigger: Exceeding free tier request limits
SiliconFlow
- What’s free: Free tier for select models
- Best for: Budget-conscious projects needing fast inference
- Upgrade trigger: Need access to premium models or higher limits
OpenRouter
- What’s free: Some models available at $0 (community-subsidized)
- Best for: Accessing free models from multiple providers through one API
- Upgrade trigger: Need paid models or guaranteed availability
Image generation with free tiers
Black Forest Labs
- What’s free: Flux 2 Dev and Flux Kontext Dev at $0/image via API
- Limits: Rate limited
- Best for: High-quality image generation without per-image cost
fal.ai
- What’s free: Free credits on signup
- Best for: Testing Flux, Kling, and other image/video models
Cloudflare Workers AI
- What’s free: Flux 1 Schnell at $0.003/image within free tier
- Best for: Cheap image generation at the edge
Proprietary model free tiers
Google Gemini API
- What’s free: Free tier for Gemini models with rate limits
- Best for: Accessing Gemini Flash (fast, capable, and free)
OpenAI
- What’s free: Limited free credits for new accounts
- Best for: Testing GPT models before committing
Anthropic
- What’s free: Limited free credits for new accounts
- Best for: Evaluating Claude models
How to maximize free tiers
Stack multiple providers. Use Groq for fast chat, Cloudflare for image gen, and Together AI for batch processing. Each has independent free limits.
Use OpenRouter as a router. Point your app at OpenRouter and let it route to free models when available, falling back to paid models only when needed.
Start with the cheapest model that works. Don’t default to GPT-5 or Claude Opus when Llama 3.3 70B or Gemini Flash might handle your use case at $0.
Cache aggressively. Most AI responses are deterministic enough to cache. A simple response cache can reduce your API calls by 50-80%.
When to upgrade
Free tiers have real limits. Upgrade when:
- Rate limits block your users — Production apps need guaranteed throughput
- You need premium models — The best models (Claude Opus, GPT-5) rarely have free tiers
- Latency SLAs matter — Free tiers often have lower priority
- You’re spending more time managing limits than building — Your time has a cost too
Bottom line
Between Groq, Cloudflare, Together AI, DeepInfra, SiliconFlow, and free Flux models, you can build a full AI application stack without spending a dollar. Use free tiers to validate your idea, then scale to paid plans when you have real users.