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What is Gemini API?
The Gemini API gives developers access to Google's Gemini models for text, image, audio, and video understanding and generation, with a generous free tier through Google AI Studio for prototyping before scaling into production.
Key features
- Native multimodal input and output across text, image, audio, video
- Generous free tier for prototyping through Google AI Studio
- Long context windows for large documents and codebases
- Function calling and structured output for app integrations
- Tight integration with Google Cloud and Vertex AI for scaling
How to get started
- Get a free API key through Google AI Studio
- Prototype your use case directly in AI Studio's playground
- Integrate the API into your app using an official SDK
- Move to Vertex AI for enterprise-scale production deployment
Gemini API pricing
The Gemini API is pay-as-you-go with a free tier for testing.
| Plan | Price | Best for |
|---|---|---|
| Free tier | $0 | Prototyping, with rate limits and lower quotas |
| Pay-as-you-go | Per token, by model | Production, billed per million tokens |
Smaller Flash models cost far less per token than the Pro models, and cached or batched requests cost less again.
Our take: Start on the free tier, then run a Flash model in production, since it handles most tasks at a fraction of Pro cost.
Prices change often. Check the official site above for current rates before you commit.
Use cases
- Prototyping multimodal AI features at low or no cost
- Building apps that need to process images, audio, or video
- Google Cloud-native applications wanting integrated AI
- Large-context tasks like analyzing long documents
Gemini API vs. alternatives
| Tool | How it compares |
|---|---|
| Gemini API | Google's multimodal models for developers. |
| OpenAI API | larger third-party ecosystem and tooling |
| Anthropic API | different reasoning strengths |
FAQ
Is Gemini API free to use?
Gemini API's plans: Free tier, usage-based pricing above limits. Pricing and free-tier limits change over time, so check the official site above for the latest details.
What is Gemini API used for?
Google's multimodal models for developers.
Who is Gemini API best for?
Gemini API is a good fit for prototyping multimodal AI features at low or no cost, or building apps that need to process images, audio, or video.
What are the alternatives to Gemini API?
Commonly compared alternatives include OpenAI API and Anthropic API, see the comparison above for how they differ.
How much does Gemini API cost?
There's a free tier for testing. Beyond that you pay per token, priced per million tokens and set by model, so the Flash models cost much less than the Pro ones.
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OLast reviewed: 2026-08 · Reviewed by AIKetra editors · How we evaluate tools