The Gemini API is Google's developer API for its Gemini models. You send text, images, audio, video or documents and get text back, and related models on the same key generate images, video, speech and embeddings. You use it to add chat, extraction, summarization, multimodal understanding or agents to an app. Keys are created in Google AI Studio.
Every API key belongs to a Google Cloud project, and rate limits apply per project, not per key. Google's unified Google GenAI SDK is the supported client, in Python, JavaScript/TypeScript, Go, Java and C#. Google currently recommends its Interactions API for new work, alongside the original generateContent calls, and an OpenAI-compatible endpoint lets existing OpenAI SDK code switch with a new key and base URL.
For a small team the useful parts are a free quota for prototyping, long-context input, function calling and structured output, context caching, and a Batch API for offline jobs. It runs only as Google's hosted service. When you need enterprise controls, the same SDK can target the Gemini Enterprise Agent Platform on Google Cloud.
The main limit is the data terms on free use. On unpaid quota, Google may use your prompts and responses to improve its products, and human reviewers may read them, so free use doesn't suit sensitive data. Outside the EEA, Switzerland and the UK, you have to link billing to avoid this. The API also works only from a listed set of countries.
giselleGiselle is an open-source tool for building and running AI workflows in a visual node ed…
“Google's Gemini models bring unmatched context, multimodal, and image generation capabilities to Giselle. With a 1M token context window, our workflows can process entire codebases, long documents, and even video content. From Gemini 2.5 Flash Lite for fast free-tier tasks, to Gemini 2.5 Flash and Pro for balanced and advanced reasoning, Gemini 3 Pro and Flash for the most demanding agentic workflows, and Gemini 2.5 Flash Image for native image generation — we leverage the full Gemini family. Google Search Grounding keeps responses current, while native multimodal support handles text, images, audio, and video seamlessly. Thank you for pushing the boundaries of AI capability!”
“Gemini's long context window is genuinely useful for Slashy's inbox summarization features. When a user has a sprawling email thread or needs their whole inbox triaged at once, Gemini handles the volume without chunking hacks. It's a powerful complement to our other models.”
“Powers all agent conversations on Konfide.
Fast, cost-effective, handles unlimited
concurrent chats. Every user message goes
through Gemini. Chose it for speed and
quality at scale.”
“Gemini is arguably one of the top foundation models and with the most upside. They're executive incredibly well. Especially strong with coding and multi-modal inputs. A great model to keep in our multi-agent toolbox.”
“We chose Gemini 3 for thegro.ai because we needed more than text generation — we needed reasoning.
Across real outbound workflows (lead research, prioritization, structured outputs, and human-sounding outreach), Gemini consistently handled long context and multi-step logic better than the alternatives we tested. It gave us strong performance, predictable formatting for Gro IQ, and a cost profile that makes scaling a self-serve AI Sales Co-Pilot viable.
For us, it wasn’t about hype — it was about building on a foundation that thinks clearly at scale.”
“Expanded our multi-model AI capabilities with strong contextual understanding.
It helped us explore richer AI workflows across planning, research, and execution.”
“Gemini's extensive token window makes it our go-to solution for one-shot analysis, enabling efficient and precise insights without the need for iterative processing.”
LLM APIMaker says so · source ↗n8nChatn8nChat is a Chrome and Firefox extension that builds, edits and debugs n8n workflows fr…
“Google's Gemini models provide excellent performance at competitive pricing, offering our users a cost-effective option for workflow generation. What sets Gemini apart is its 2M token context window that allows for ingesting extensive documentation and workflow history, plus its strong structured output capabilities that help generate precise node configurations.”
LLM APIMaker says so · source ↗Migma AIMigma AI generates marketing email campaigns that match your brand, audience and calenda…
“Enhancing our email creation with powerful AI capabilities. Helps us generate better copy, images, and designs to create truly engaging emails.”
Open source: a project that declares Gemini API as a dependency in its public code — verifiable, but not necessarily a live product.
What makers say
70 makers on why they use Gemini API, in their own words on Product Hunt.
Google's Gemini models bring unmatched context, multimodal, and image generation capabilities to Giselle. With a 1M token context window, our workflows can process entire codebases, long documents, and even video content. From Gemini 2.5 Flash Lite for fast free-tier tasks, to Gemini 2.5 Flash and Pro for balanced and advanced reasoning, Gemini 3 Pro and Flash for the most demanding agentic workflows, and Gemini 2.5 Flash Image for native image generation — we leverage the full Gemini family. Google Search Grounding keeps responses current, while native multimodal support handles text, images, audio, and video seamlessly. Thank you for pushing the boundaries of AI capability!
We chose Gemini 3 for thegro.ai because we needed more than text generation — we needed reasoning.
Across real outbound workflows (lead research, prioritization, structured outputs, and human-sounding outreach), Gemini consistently handled long context and multi-step logic better than the alternatives we tested. It gave us strong performance, predictable formatting for Gro IQ, and a cost profile that makes scaling a self-serve AI Sales Co-Pilot viable.
For us, it wasn’t about hype — it was about building on a foundation that thinks clearly at scale.
Google's Gemini models provide excellent performance at competitive pricing, offering our users a cost-effective option for workflow generation. What sets Gemini apart is its 2M token context window that allows for ingesting extensive documentation and workflow history, plus its strong structured output capabilities that help generate precise node configurations.
The model that does the actual work. Gemini 3 Pro generates every template EmailTemple ships — full HTML, ESP-native, brand-aware. Tested every major frontier model against side-by-side outputs. Gemini won on structural soundness and instruction-following inside long system prompts. Long context made the multi-document architect prompts possible.
We found that the outputs we were getting were consistent - to get to production it was also relatively cost effective. On top of that, the latency was low enough to keep things fast for users, and the massive context window meant we didn't have to build complex data pipelines just to handle the risk large inputs.
Public pull requests on GitHub since Oct 2024 whose title says "X to Y" — real code changes moving a project from one tool to another, by developers in general. Open a row to see the pull requests.
OpenAI API → Gemini APIfeat(dh): switch listup web search from OpenAI to Gemini · growthhackerssnu/adminSwitch production thumbnails from OpenAI to Gemini · kevin4relocate/TripCautionfeat: move OpenAI and Google defaults to GPT-6 and Gemini 3 · tag1consulting/ai-pr-reviewMigrate from OpenAI to Google Gemini for embeddings and LLM · aniilhr/agentic-ai-rag-chatbotfix: preserve image parts in OpenAI to Gemini responses · moeacgx/NewAPI-MaoUpdating from OpenAI to Gemini in llm.py following the potential toke… · harpand87/banking-support-agentSwitch the assistant LLM from OpenAI to Gemini · stariik/Miaport(upstream): #4274 - disambiguate colliding tool call ids in openai to gemini · bloodf/durindoorfeat(gemini): convert OpenAI Embeddings to Gemini embeddings · tbphp/gpt-loadSwitch AI provider from OpenAI to Google Gemini · Oricrew/service-scheduler179+PRs
Claude → Gemini APISwitch the chatbot from Claude to Gemini (free tier) · anelisa-lab/AI-BudgetingMigrate AI agent from Claude to Google Gemini · Vaishnavi6267/social-media-engagement-agentSwitch model provider from Claude to Google Gemini · dhruhisheth/rightslineSwitch AI backend from Anthropic Claude to Google Gemini · masasukexx-tech/en-marketing-lpfeat(agentcc): route Claude Agent SDK requests to Vertex Gemini · future-agi/future-agiSwitch the LLM goal compiler from Claude to Gemini · abimundayat26/twin-bankSwitch the AI engine from Anthropic Claude to Google Gemini (free tier) · itzvxie/demo-siteMember 1: Switch AI agent from Claude to Gemini (free tier) · Dibyajyoti882/MetricMindMigrate voice assistant from Claude to Google Gemini API · feyyazonkal33/iddaa-analiz-appSwitch AI rule parsing from Claude to Gemini · ananyaprabhakarm/AI-Backtesting-Agent105+PRs
Groq → Gemini APIFall back from Groq to Gemini text when the model is retired or rate-limited · cyangjr/marketplace-scoutSwitch Lumi chat from Groq to Google Gemini 2.0 Flash · ThabisoCollinSengane/PulsifySwitch deepeval CI judge from Groq to Gemini 3.1 Flash-Lite · truongpx396/agent-core-demofix: route Site Agent plain Groq calls to Gemini fallback · akamanim/khasroyMove the AI features from Groq to Gemini · bogdan0089/fastapi-ecommerce-backendSwitch AI grading/recommendation backend from Groq to Gemini · crabb-beltran/de-dojofeat(songs): switch screenshot extraction from Groq to Gemini · alesmo30/song-shiftswitched groq api call to gemini api · NafisaTasnimR/KeepifyMigrate LLM backend from Groq to Gemini · muizzusman/youtube-content-engineSwitch LLM and transcription from Groq to Gemini · abhijeetmishra2104/sonicscribe-app164PRs
DeepSeek → Gemini APIMove the LLM from Azure DeepSeek to Gemini · tli9181991/dashboard-testingSwitch the agent's model from DeepSeek to Gemini · CHATSCD/Shauns-coding-agentSwitch Phase 1 LLM decision from DeepSeek to Gemini API · ChiragVenkateshaiah/tesserafeat(llm): write text with DeepSeek, leave every picture to Gemini · pinnnthreetriples/telebubaSwitch from OCR+DeepSeek to Google Gemini 2.0 Flash vision model · Muhabuki003/PASSfix: DeepSeek fallback to Gemini + sanitize orphan tool messages · KrisParjaman/wa-webhook-sbsrSwitch chat API from DeepSeek to Google Gemini. · kumarsinghaman/Portfoliofeat: switch AI proxy from DeepSeek to Gemini 2.0 Flash · jfcyberknight/darkmedia-x_prompt-aifeat: migrate AI provider from DeepSeek back to Gemini 3.5 Flash · DietCokewithSugar/help-me-investmigrate from deepseek to gemini · GilMM27/scrum-master-AI15PRs
Mistral AI → Gemini APISwitch RAG backend from Mistral to Gemini (uses GEMINI_API_KEY) · legendONE382/AskdocsAdd config-driven cross-model overflow routing (model_routing); route Mistral Medium to Gemini 3.5 Flash Lite · BashfulBits/city-meeting-podcastsMigrate from Mistral to Google Gemini API · TomJoly/TomJoly-ecriplus-assistantUpdate test models from OpenAI/Mistral to Google Gemini · ProJedi1234/OpenRouterKitSwitch from Mistral to Gemini · 6ba3i/travel-botfix:migrated from mistral to gemini 2 flash · iutkarsh077/pyq6PRs
Gemini API → GroqCollege MVP: switch LLM provider from Gemini to Groq (sole provider) · akshat2685/pathmindSwitch idea rating/roadmap generation from Gemini to Groq · LaKhWaN/startup-gameSwitch in-app AI provider from Gemini to Groq · jubayerjuhan/cognivoMigrate from Gemini API to Groq API · Hushnudbek-s-organisation/ScholarBridgeAifeat(ai): switch AI diagnostic engine from Google Gemini to Groq · SHOEBILL04/Garijfeat(gateway): switch the non-technical summary from gemini to groq · MicroTodoSuite/microservice-app-slack-approval-gatewayUse Gemini as Jarvis's reply engine, fall back to Groq on failure · deepseatrader18/deepsea-dashboardchanged the model provider from google gemini to groq · Rit2002/placeintelSwitch AI Assistant from Gemini to Groq · every1hatestaha-png/busniessOSSwitch formatting/ front & back matter conversion from Gemini to Groq · lndat18/production-legal-qa-rag152PRs
Gemini API → Claudefix(refine): session-end refine uses gemini first, falls back to claude on availability failures · JohnGavin/llmAdd Gemini as an alternative AI research provider to Claude · Nikros07/Eye-of-HorusBring Codex CLI, Gemini CLI and Grok Build up to Claude Code's features · oddessentials/agent-guilddocs: migrate governance reviews from Gemini to Claude · Kaancodm/GeniusNewAdd Gemini as a free alternative to Claude · Harshith017/maxxtempoAdd Gemini MCP server exposing ask_gemini tool to Claude · keshav321-kg/fintechSwitch summary generation from Gemini back to Claude · varunsagar20/module2-DBSwitch `update-github-info` from unpriced Gemini pin to priced Copilot Claude model · naveedausaf/skills-agentic-workflows-that-read-the-roomSwitch AI content generation from Gemini to the Anthropic Claude API · kniepertsebastian-spec/learningchore(ci): triage every new issue with Gemini, and hand approved ones to Claude with claude:go · hectorcanaimero/orch108+PRs
Gemini API → OpenAI APIgemini fallback to openai fixes · maximhq/bifrostSwitch LLM backend from Gemini to OpenAI gpt-4o-mini · PiSquareLabs/PathShalaperf(gemini): Migrate Gemini to OpenAI format · tisfeng/Easydictfixes foreign-function-call-id issue for fallback from gemini to openai · maximhq/bifrostSwitch the model calls from Gemini to OpenAI gpt-5.4-mini · MishaMatcharashvili/trip-iorefactor: migrate AI insights service from Gemini API to OpenAI API · TkYaLa34/AI-Investment-Research-Platform-Switch AI provider from Gemini to OpenAI, add dialogue lessons, fix e… · aaryashah1010/Fluentifymigrated from gemini to openai llm · mohitgarg196/CodeVitals-AIFix Gemini adapter to support OpenAI SDK client format · arvindg4u/APIKeyRotatorFix Gemini chat model + image fallback to OpenAI · fabelanorma3010/How--to-wite--a-fiction-book90+PRs
Gemini API → DeepSeekdocs: switch initial LLM provider from Gemini to DeepSeek · isseis/yt2columnfeat: Switch from Gemini to DeepSeek AI · qianhaoq/dota2.aiMove off Gemini to DeepSeek, and port the missing AI routes to Functions · aalikes/voxartisanLLM model is switched from Gemini to DeepSeek for Genkit comsuption · benxgao/certifai-apirefactor: Gemini to DeepSeek 모델 마이그레이션 · y0ngha/siglensDrop Gemini and the LLM picker; lock Scout to DeepSeek v4-flash. · marginsystems/x-copilotfeat(ai): switch scoring pipeline from Gemini to DeepSeek V4 Pro · Wekhoh/AMZ-Daily-Digest-Switch LLM provider from Gemini to DeepSeek V4 Flash · huthvincent/yt-bilingual-appMigrate Gemini integrations to DeepSeek · MarkYangjiayi/stock_analysis_websiteSwitch AI provider from Gemini to DeepSeek v4 Flash · Heyians/Sistema-de-engajamento-Instagram-24PRs
Gemini API → Mistral AICHE-35: Switch out Google Gemini text models to Berget.ai Mistral Small 3.2 · AlltidSemester1337/chefrefactor(api): switch from Gemini to Mistral AI for document chat and… · legendONE382/Askdocsdocs: ADR-008 — default narration on Gemini TTS, Voxtral cloning scoped to Mistral · darth-dodo/cantastorieMigrate Gemini to Mistral for resume parsing · pointblank-club/pb-placementsSwitch need checking from Gemini to Mistral · givefood/givefoodAI Change from gemini to mistral api · ayushsingh01042003/Scanx6PRs
Does Google use my API prompts to train or improve its models?
It depends on whether you're paying. On unpaid quota, Google may use prompts and responses to improve its products, and human reviewers may see them. On paid use (a project with active billing), it doesn't use them for that and logs them only for a limited time to detect abuse. source ↗
Can I use the free tier for an app with users in Europe?
No. If your app serves users in the EEA, Switzerland or the UK, the terms require Paid Services. For developers in those regions, free use is also treated under the paid data terms. source ↗
Is the Gemini API available in every country?
No. You can only use it from the countries on Google's available-regions list, and mainland China and Hong Kong aren't on it. source ↗
How do rate limits work?
Limits apply per project, not per API key. They are measured in requests per minute, tokens per minute and requests per day, and the daily quota resets at midnight Pacific time. Linking billing and spending more moves the project up tiers automatically, and paid tiers also have a rolling 10-minute spend limit. source ↗
Can I use the OpenAI SDK with Gemini?
Yes. Point the OpenAI Python or JavaScript library at Google's OpenAI-compatible base URL and use a Gemini API key. If you aren't already on the OpenAI libraries, Google recommends calling the Gemini API directly. source ↗
Is there a cheaper mode for bulk jobs?
Yes. Batch Mode processes requests asynchronously at half the standard price, with a target turnaround of 24 hours, though most batches finish much sooner. source ↗
Which languages have an official SDK?
The Google GenAI SDK covers Python, JavaScript/TypeScript, Go, Java and C#. Google has called it generally available and the recommended way to call the API. source ↗
When should I use the Enterprise Agent Platform instead?
Google says most developers should use the Gemini Developer API and switch only when they need enterprise controls from Google Cloud. Both are reachable through the same GenAI SDK, so switching is mostly a matter of client configuration. source ↗
Is Gemini API free?
Yes — there is a free tier a small product can run on; paid use starts at Pay per token. source ↗
Is Gemini API open source or self-hostable?
Not open source, and hosted only.
Can AI coding agents work with Gemini API?
Lovable, Replit set it up natively.
Who uses Gemini API?
99 makers' products we track, each with a source, and 227 open-source projects declare it in their code. source ↗
giselleGiselle is an open-source tool for building and running AI workflows in a visual node ed…
OpenAI API → Gemini API
Claude → Gemini API
Groq → Gemini API
DeepSeek → Gemini API
Mistral AI → Gemini API
Vertex AI
Grok API