Free AI APIs
20+ providers offering free tiers, trials, and credits. Start building with AI without spending a dime.
Why Free AI APIs Exist
AI providers offer free tiers to help developers evaluate their platforms, build prototypes, and ultimately scale to paid plans. These free offerings have become a cornerstone of the AI ecosystem.
Evaluation
Test model quality, latency, and reliability before committing to a paid plan. Free tiers let you benchmark providers against your specific use case with real traffic.
Prototyping
Build and test your AI application without upfront investment. Most free tiers are generous enough to handle development, staging, and small-scale production.
Competition
With 20+ providers competing, the market drives innovation. Free tiers are a competitive strategy — providers bet that once you build on their platform, you will stay.
Ecosystem Growth
Free APIs grow the AI ecosystem by lowering barriers to entry. More developers building means more applications, more demand, and a healthier industry for everyone.
All Free API Providers
20 providers offering free AI model access. Compare offerings and find the right fit for your project.
| Provider | Domain | Free Tier Description |
|---|---|---|
| AgentRouter | agentrouter.org | Route requests across 100+ models through a single API. Free tier with 100K tokens/month. No credit card required. |
| OpenRouter | openrouter.ai | Access 200+ models including GPT-4, Claude, Gemini, Llama. Free $1 credit on signup. Unified API with fallbacks. |
| Azure AI | azure.microsoft.com | Enterprise access to OpenAI, Llama, Mistral models via Azure. $200 free credits for new users. SLA guarantees included. |
| Google Gemini | ai.google.dev | Gemini 1.5 Flash and Pro with 1M token context. 60 requests/minute free. No credit card required. |
| Anthropic Claude | anthropic.com | Claude 3.5 Sonnet and Haiku. $5 free trial credits. 200K context, enterprise safety, and compliance. |
| Cohere | cohere.com | Free API key on signup. RAG, embeddings, and classification. Command R models optimized for enterprise search. |
| Hugging Face | huggingface.co | Free Inference API. 150,000+ open-source models. Serverless inference for Llama, Mistral, StarCoder. |
| Replicate | replicate.com | Free rate-limited tier. Run open-source models via API. Pay-per-second pricing from $0.0008/s compute. |
| Together AI | together.ai | $25 free credits. 100+ open-source models. Supports Llama, Mistral, DeepSeek. Custom fine-tuning available. |
| DeepInfra | deepinfra.com | Free rate-limited tier. Serverless inference for Llama 3, Mixtral, DeepSeek. No credit card needed. |
| Groq | groq.com | Free API with rate limits. Ultra-fast LPU hardware inference. Llama 3, Mixtral, Gemma. 10x faster than GPUs. |
| Perplexity AI | perplexity.ai | Free tier with limited requests. Online search-capable models. Access to Perplexity research models. |
| Mistral AI | mistral.ai | Free rate-limited API. Mistral Large, Small, Tiny models. Open-source weights. 100+ language support. |
| AI21 Labs | ai21.com | Free trial credits. Jamba 1.5 hybrid Mamba-transformer models. Long-context reasoning and structured outputs. |
| Writer AI | writer.com | Free trial API. Palmyra models for content generation, RAG, data extraction. Built-in enterprise guardrails. |
| NLP Cloud | nlpcloud.com | Free 1M chars/month. NER, classification, summarization, code generation. Pay-as-you-go pricing available. |
| Fireworks AI | fireworks.ai | $25 free credits. 50+ open-source models. 4x faster throughput for Llama, Mixtral, DeepSeek. |
| OctoAI | octoai.com | Free credits on signup. Stable Diffusion, Llama, Mistral inference. Fine-tuning and custom deployment. |
| Lepton AI | lepton.ai | Free compute credits. Serverless GPU inference. Deploy custom models with automatic scaling. |
| Banana Dev | banana.dev | Free GPU credits. Serverless ML inference. PyTorch, TensorFlow, custom containers. |
How to Start Using Free AI APIs
Most providers follow a similar signup flow. Here is what to expect.
Create an Account
Sign up on the provider website. Most accept Google or GitHub OAuth. Some require a phone number. Few require a credit card for free tiers.
Get Your API Key
Generate an API key from the provider dashboard. Store it securely — never commit keys to version control or expose them in client-side code.
Make Your First Call
Use curl, Python, or JavaScript to send your first request. Most providers have OpenAI-compatible endpoints, so switching between them is straightforward.
Maximizing Free Tiers
Use Multiple Providers
Combine free tiers from multiple providers to get more total capacity. Route different task types to different providers based on their strengths.
Monitor Your Usage
Track API calls and token usage across providers. Set up alerts before hitting rate limits. Most dashboards provide real-time usage metrics.
Implement Fallbacks
Design your application with fallback logic. If one provider hits rate limits, automatically route to another. AgentRouter excels at this with automatic failover.
Read the Fine Print
Free tiers have limitations — rate limits, usage caps, data usage policies. Read each provider terms carefully, especially if processing sensitive data.