Gemini API

What is Gemini API?

The Gemini API is Google's hosted interface for building Gemini models into applications. Developers create an API key in Google AI Studio, try prompts in the browser, and then call the models from code for text, reasoning, multimodal input, grounding and agent workflows. New accounts begin on a Free tier with limited model access and free-of-charge tokens on some models. Upgrading to the Paid tier requires a linked billing account and a prepaid balance of at least $5 in credits. Paid usage is billed per 1 million input and output tokens, with context caching, a Batch API that cuts cost by 50%, and Grounding with Google Search or Maps that includes 5,000 free requests per month before $14 per 1,000. Rate limits are set per project and rise through Tier 1, 2 and 3 as spend grows. Enterprise deployments run through the Gemini Enterprise Agent Platform with provisioned throughput and volume discounts.

Use cases

• Add Gemini models to an app through an API
• Prototype prompts in Google AI Studio
• Build agents with multi-step reasoning
• Ground answers with Google Search or Maps
• Run bulk jobs through the Batch API
• Cache long context to lower token costs

Who it's for

• Developers
• Startups
• Engineering teams
• AI product builders

Why use Gemini API

• The free tier lets you build and test with an API key before spending anything.
• Token-based billing means cost follows actual usage instead of a fixed seat price.
• Batch processing and context caching give clear ways to lower the cost of large or repeated workloads.
• Usage tiers raise your rate limits automatically as your cumulative spend grows.
• AI Studio and the API share projects and keys, so a prompt tested in the browser moves to code easily.

Gemini API features

• API keys and prototyping in Google AI Studio
• Free tier with limited access to certain models
• Pay-as-you-go pricing per 1M input and output tokens
• Context caching with implicit caching on newer models
• Batch API with a 50% cost reduction
• Grounding with Google Search and Google Maps
• Usage tiers (Free, Tier 1, 2 and 3) with rising rate limits
• Spend-based rate limits on a rolling 10-minute window
• Enterprise option with provisioned throughput and dedicated support

Gemini API integrations

• Google AI Studio
• Google Cloud
• Google Search
• Google Maps

How to get started with Gemini API

1. Sign in to Google AI Studio, where a project and API key are created for new users by default.
2. Test prompts and models in AI Studio, then copy the code into your application.
3. Call the API with your key; the Free tier applies until you link billing.
4. To go to the Paid tier, link a billing account and prepay at least $5 in credits.
5. Monitor tier, billing plan and rate limits on the AI Studio Projects and Billing pages.

Gemini API limitations

• Free tier content may be used to improve Google products, while paid tier content is not
• Some models, including Gemini 4 Argon, are not available on the Free tier
• Rate limits apply per project and are measured in requests per minute, tokens per minute and requests per day
• The Paid tier needs a linked billing account and a minimum $5 prepay

Gemini API pricing

Yes, Gemini API has a free plan.

Gemini API plans

• Free

  Free

  • Limited access to certain models
  • Free input and output tokens
  • Google AI Studio access

• Paid

  Pay as you go

  Prepay credits, minimum $5

  • Higher rate limits for production
  • Context caching
  • Batch API (50% cost reduction)
  • Content not used to improve products

• Enterprise

  Custom

  • All features in Paid
  • Dedicated support channels
  • Advanced security and compliance
  • Provisioned throughput
  • Volume-based discounts

Plans as listed on the official pricing page on 24 Oct 2026. Prices can change and may vary by country or exclude tax. Check the official pricing page.

Gemini API alternatives

The main Gemini API alternatives listed on Debuly are OpenAI API, Mistral AI, Cohere, Groq, Together AI and AI21 Labs. The table compares pricing and platforms; order is A–Z.

1. 

   AI21 Labs

   Enterprise AI company offering Jamba language model APIs, AI21 Studio and custom post-training of models on a company's own data.

   Developer platformsAutomation and agents
   FreemiumVisit AI21 Labs (official site)
2. 

   Cohere

   Enterprise AI company offering Command, Embed and Rerank models by API, the North agent platform and private deployments.

   Developer platformsResearch and searchAutomation and agents
   FreemiumVisit Cohere (official site)
3. 

   Groq

   GroqCloud inference API that serves open models such as GPT-OSS and Whisper on Groq's LPU hardware, billed per token.

   Developer platformsAudio and voiceCoding
   FreemiumVisit Groq (official site)
4. 

   Mistral AI

   AI company offering open-weight models, the Vibe assistant, Studio and an API, with a free plan and paid tiers.

   Developer platformsChat assistantsCoding
   FreemiumVisit Mistral AI (official site)
5. 

   OpenAI API

   Developer API for OpenAI's GPT models, image generation, realtime voice and transcription, priced per million tokens with batch and flex options.

   Developer platformsCodingAudio and voice
   PaidVisit OpenAI API (official site)
6. 

   Together AI

   AI cloud for running open-source models through serverless and batch inference, dedicated endpoints, GPU clusters and fine-tuning.

   Developer platformsCoding
   PaidVisit Together AI (official site)

Gemini API FAQ

Sources & verification

Facts on this page come from the official sources below, each with the date we read it. Written by Debuly; the vendor did not review this page.

Image credits

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