“Shoutout to OpenAI for powering our brains with GPT—couldn't build magic without you.”
LLM APIMaker says so +2 · source ↗
OpenAI API
API for GPT models: text, images, speech, embeddings and agents.
Works with AI agents:llms.txtBuilt into Lovable, ReplitThe OpenAI API gives your backend HTTP access to OpenAI's models: text and code generation, reasoning, image generation and editing, speech-to-text, text-to-speech, realtime voice, embeddings and moderation. It is how you put GPT models inside your own product, billed to your organization rather than to a ChatGPT subscription.
You authenticate with a secret API key that belongs to a project inside an organization; rate limits, spend limits and data settings are set at those two levels. OpenAI recommends the Responses API for new work: one endpoint that can keep conversation state on OpenAI's side (store) and call built-in tools such as web search, file search, code interpreter, computer use and remote MCP servers. The older Chat Completions API is still supported. Official SDKs cover TypeScript/JavaScript, Python, .NET, Java, Go and Ruby, plus an Agents SDK for TypeScript and Python.
For a small team the useful pieces are structured outputs and function calling, a Batch API for offline jobs, prompt caching, fine-tuning, evals, and per-project spend limits and alerts. It runs only as OpenAI's hosted service; eligible customers can pin projects to regions such as the US or EU, and the models are also sold through Microsoft Azure.
The main limit is that the models are closed: you can't self-host them, and your traffic depends on OpenAI's terms, rate-limit tiers and model deprecation schedule.
Where it fits
How OpenAI API itself is built
5 tools, from its own code, website and Product Hunt page.
Who uses it
734 makers' products, each linked to the source that shows it, and 481 open-source projects that declare it in their code.
“OpenAI's GPT models power a wide range of Giselle's AI workflows. From GPT-5 nano for quick, cost-effective tasks on our free tier, to GPT-5 mini for balanced everyday use, GPT-5 and GPT-5.1 Codex for complex reasoning and coding agents, and GPT-5.2 for the most demanding challenges — we leverage the full GPT family. The Reasoning Effort parameter lets users fine-tune the balance between speed and depth, while Web Search keeps workflows grounded in real-time information. Thank you for building such a versatile AI platform!”
LLM APIMaker says so +1 · source ↗“OpenAI function calling powers the new evaluation service. Reliability out of the box without any weird outputs!”
LLM APIMaker says so +1 · source ↗“Our LLM features are powered by OpenAI”
LLM APIMaker says so +1 · source ↗“We use OpenAI to power Plane AI — enabling teams to chat with their projects, write PRDs, dedupe issues, and get instant insights. It’s the brain behind everything smart inside Plane.”
LLM APIMaker says so +1 · source ↗“Image 2.0 is just on a next level”
LLM APIMaker says so +1 · source ↗“Supabase AI Assistant leverages the incredible capabilities of OpenAI’s models to deliver intelligent, context-aware assistance for developers.”
LLM APIMaker says so +1 · source ↗“Reliable SOTA AI models.”
LLM APIMaker says so +1 · source ↗“OpenAI's models are part of our multi-model architecture. We use different models for different tasks within Slashy: some optimized for speed, others for nuance. OpenAI's API reliability and breadth of capabilities made it a natural part of our stack.”
LLM APIMaker says so +1 · source ↗“The most reliable foundation model for fast, high-quality copy generation.”
LLM APIMaker says so +1 · source ↗“Shoutout to OpenAI for kickstarting the generative AI revolution with ChatGPT! Their groundbreaking work has inspired countless innovations. We're excited to build on their achievements and grateful for their, ahem, "privacy concerns" that helped make our product possible. Proud to have supported OpenAI's models from the start. Here's to advancing AI while keeping data safe!”
LLM APIMaker says so +1 · source ↗“ChatGPT Atlas is a groundbreaking browser that integrates ChatGPT right into your workflow. The seamless sidebar experience enables quick summarization and analysis of content without switching tabs. It truly feels like having a smart assistant on every page, improving productivity and delivering a more intuitive browsing experience.”
LLM APIMaker says so +1 · source ↗“Provides state-of-the-art LLMs for reasoning and codebase understanding. Powers planning and verification workflows in Traycer.”
LLM APIMaker says so +1 · source ↗“We use OpenAI models for parts of automated scenario generation, evaluation and building some of our pre-defined metrics”
LLM APIMaker says so +1 · source ↗“Lovely documentation for building on the OpenAI Response API.”
LLM APIMaker says so +1 · source ↗“Complex analysis, competitive intelligence, deep research”
LLM APIMaker says so +1 · source ↗“Great array of models for different purposes, and love the playground for quick exploration”
LLM APIMaker says so +1 · source ↗“I mean, come on, literally none of this would have been possible without the amazing work that Sam and his team have been doing for years. At this point "having" AI your product is basically OpenAI :)”
LLM APIMaker says so +1 · source ↗“Still the most consistent model for high-stakes support answers. GPT-4-turbo gives us control, reliability, and depth — all critical for enterprise use. Most production-ready reasoning and tool use stability.”
LLM APIMaker says so +1 · source ↗“For the latency-sensitive work, OpenAI fit best.”
LLM APIMaker says so +1 · source ↗“Among the main LLM provider for power our assistants.”
LLM APIMaker says so +1 · source ↗“We use GPT-4 internally for writing copy (like this one!) and in our app to give our users the highest quality of GenAI answers possible”
LLM APIMaker says so +1 · source ↗Open source: a project that declares OpenAI API as a dependency in its public code — verifiable, but not necessarily a live product.
What makers say
503 makers on why they use OpenAI API, in their own words on Product Hunt.
We chose OpenAI for the combination of engineering depth, integrated tooling, and its investment in defensive security. Stile operates in identity verification, where edge cases and security boundaries matter. Codex’s GitHub code review integration fits directly into our development process. Specialized agents let us tackle implementation, testing, security review, and documentation in parallel, while generous usage limits give us room to iterate. Daybreak’s focus on finding vulnerabilities, validating risks, and developing fixes makes the ecosystem especially compelling for a company building security-sensitive infrastructure. GPT-image-2 has also been a huge help to our marketing team, from creating visuals for the Stile website to developing presentations for client meetings. It helps us turn complex identity-verification concepts into visuals customers can understand. OpenAI stands out because it supports meaningful work across engineering, security, and marketing, all within the same ecosystem.
Mentions crunches tons of data to give you actionable insights—thanks to GPT-4o. Its advanced NLP understands context, sentiment, and trends way better than older models. Smarter analysis, fewer false positives, and actual useful results. We tested several AI models (including Claude 3 & Gemini) before choosing GPT-4o for Mentions’ analysis—here’s why: Its multimodal chops, speed, and nuanced understanding of context blow older models out of the water. Fewer false positives, sharper sentiment detection, and way better handling of sarcasm (because the internet is wild). For tracking what matters, GPT-4o was the clear winner.
MentionsSep 2026 ↗GPT-5 is the engine behind every AI feature in Cloud World Model - bottleneck analysis, autoscaling explanations, architecture optimization suggestions, and beginner mode (which rewrites technical output into plain English). The quality of reasoning matters here: users trust these explanations to make real infrastructure decisions. GPT-5 consistently gives specific, actionable answers rather than generic advice, and the structured output reliability made it straightforward to integrate into a simulation pipeline where the AI response has to parse cleanly every time.
Cloud World ModelSep 2026 ↗GPT-5 is the engine behind every AI feature in Cloud World Model - bottleneck analysis, autoscaling explanations, architecture optimization suggestions, and beginner mode (which rewrites technical output into plain English). The quality of reasoning matters here: users trust these explanations to make real infrastructure decisions. GPT-5 consistently gives specific, actionable answers rather than generic advice, and the structured output reliability made it straightforward to integrate into a simulation pipeline where the AI response has to parse cleanly every time.
Cloud World ModelJun 2026 ↗OpenAI provided us the API and tooling necessary for us to build out validation, eval harnesses, comparisons, and split out tasks with varying model sizes to ensure we tackle the big problems (document generation) correctly, and smaller problems (organizing, in-line analysis, etc.) with smaller models. The flexibility and breadth of their AI offerings was a natural fit with Moxie Docs. GPT 5.6 Sol and their latest models alongside Codex greatly enhances our delivery timeline, ability to audit and improve code performance and refactoring, and our long term success.
Moxie DocsSep 2026 ↗Loved and watch-outs
Themes that recur in makers' words and Hacker News comments, each linked to what it summarises, with how Product Hunt tags its reviews.
- Its models are strong at code generation, reasoning and creative tasks, often chosen after testing alternatives. PHPH 2PH 3PH 4
- The API is reliable and well-priced as the foundation for production features. PHPH 2PH 3HN
- Good docs and a smooth developer experience make integration straightforward. PHPH 2PH 3PH 4
- Whisper gives accurate speech-to-text across many languages. PHPH 2PH 3
Reliability and open issues
- major Issues with login, signup, and ads Oct 2026
- minor Elevated latency for some API requests Sep 2026
- minor Elevated error rates for ChatGPT Pro and Plus users Sep 2026
Who switches
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.
Gemini API → OpenAI API90+ PRs
- gemini fallback to openai fixesmaximhq/bifrost · 2026-10-02
- Switch LLM backend from Gemini to OpenAI gpt-4o-miniPiSquareLabs/PathShala · 2026-09-30
- perf(gemini): Migrate Gemini to OpenAI formattisfeng/Easydict · 2026-09-29
- fixes foreign-function-call-id issue for fallback from gemini to openaimaximhq/bifrost · 2026-09-29
- Switch the model calls from Gemini to OpenAI gpt-5.4-miniMishaMatcharashvili/trip-io · 2026-09-25
- refactor: migrate AI insights service from Gemini API to OpenAI APITkYaLa34/AI-Investment-Research-Platform- · 2026-09-23
- Switch AI provider from Gemini to OpenAI, add dialogue lessons, fix e…aaryashah1010/Fluentify · 2026-09-22
- migrated from gemini to openai llmmohitgarg196/CodeVitals-AI · 2026-09-21
- Fix Gemini adapter to support OpenAI SDK client formatarvindg4u/APIKeyRotator · 2026-09-20
- Fix Gemini chat model + image fallback to OpenAIfabelanorma3010/How--to-wite--a-fiction-book · 2026-09-05
Claude → OpenAI API89 PRs
- fix: round-trip Claude tool_use to OpenAI tool_callsks1686/peaproxy · 2026-09-27
- Switch receipt AI scan from Claude to OpenAIianselmi/cardmaster · 2026-09-26
- Migrate from Claude to OpenAI API for synthesis toolsarkhash0309/research-paper-intelligence-pipeline · 2026-09-25
- Switch Alora Chat from Claude to OpenAIvaniabhagania/Alora · 2026-09-24
- Migrate all Claude resume tailoring to OpenAIrfahamedansari/job-application-assistant · 2026-09-23
- feat(claude): map output_config.format to OpenAI response_formatrouter-for-me/CLIProxyAPI · 2026-09-23
- feat(claude-boxes): allow codex egress to the OpenAI auth and API hostsLanternfyre/home-lab · 2026-09-22
- [synthmind-bot] Security Researchers Use Anthropic Claude to Hack OpenAI — 2026-09-18administrakt0r/AIautonomousBlogMY · 2026-09-18
- Switch LLM provider from Anthropic Claude to OpenAI GPT-4o.sji-soumik/ai-assessment · 2026-09-11
- fix: clamp Claude Code egress to OpenAI and Gemini (RUN-1515)NeuralTrust/TrustGate · 2026-09-10
Groq → OpenAI API25 PRs
- Switch SAP prompt improver from Groq to OpenAIabhishekashishde-byte/SAP-Brain · 2026-09-22
- refactor: migrate from Groq to OpenAI gpt-5.4-nano for ISL translationkarchit1128/Sanket · 2026-09-22
- Change Groq LLM models: from Llama 3.3 to OpenAI GPTpattames/vet_chatbot_v2 · 2026-09-20
- Changed AI used from groq to openaiReDILABMunich/Helferei · 2026-09-16
- Restore 2026-03-22 QuantSage build and switch AI provider from Groq to OpenAIkabwefrancis13-web/KABWE · 2026-09-15
- fix(groq): migrate deprecated llama models to openai gpt-ossDushmilan/CodeCoach-AI · 2026-08-24
- feat: migrate ForgePair agents from Groq to OpenAIbfrpaulondev/dev-agent-lab · 2026-08-21
- fix(ai): never send Groq catalog ids to OpenAIRevealUIStudio/revealui · 2026-08-18
- Migrate chatbot from Groq to OpenAIhari9255/app_service_demo · 2026-08-10
- Migrate receipt extraction from Groq to OpenAI (gpt-4.1-mini)IlyaShynkevich/grocery-buddy · 2026-08-01
DeepSeek → OpenAI API16 PRs
- OLS-4315 - move from deepseek to openai on bedrock and update openai modelsopenshift/lightspeed-service · 2026-09-30
- fix(deepseek): default to OpenAI Chat Completions instead of Responses APIdiegosouzapw/OmniRoute · 2026-09-21
- fix: preserve imageIncapable overrides and migrate DeepSeek preset to OpenAIringotypowriter/yachiyo · 2026-06-18
- chore: switch LLM provider from DeepSeek to OpenAI (gpt-4o-mini)pau-vega/parrot-ai · 2026-06-17
- feat: implement DeepSeek tool call parsing and conversion to OpenAI f…skymoonsun/model-maestro · 2026-04-30
- Migrate effort estimator LLM integration from DeepSeek to OpenAI Chat Completions2025ag05127-blip/effort-estimator · 2026-04-21
- fix(providers): switch DeepSeekProvider from deepseek SDK to OpenAI c…semantica-agi/semantica · 2026-04-18
- Switch AI integration from DeepSeek to OpenAI ChatGPT and update UI messagingantonioreinoespiritual-ux/prueba_centro_experimental · 2026-02-06
- Refactor: migrate DeepSeek client to use OpenAI libraryVitalyRS/TelegaAutoPublishNEWS · 2025-11-04
- Remove DeepSeek references and migrate to OpenAIhenribesnard/harena · 2025-08-20
Mistral AI → OpenAI API4 PRs
- test: fix Mistral test due to new OpenAI SDK releasedeepset-ai/haystack-core-integrations · 2026-09-01
- Port AI integration from Mistral to OpenAI API; rename Mistral→Chat throughoutLavey/mastra48 · 2026-03-18
- feat: migrate from Mistral to OpenAI gpt-5-nanoLyleW473/NLPGroupCoursework · 2025-12-07
- test: adapt Mistral to OpenAI refactoringdeepset-ai/haystack-core-integrations · 2025-01-02
OpenAI API → Gemini API179+ PRs
- feat(dh): switch listup web search from OpenAI to Geminigrowthhackerssnu/admin · 2026-10-01
- Switch production thumbnails from OpenAI to Geminikevin4relocate/TripCaution · 2026-09-30
- feat: move OpenAI and Google defaults to GPT-6 and Gemini 3tag1consulting/ai-pr-review · 2026-09-29
- Migrate from OpenAI to Google Gemini for embeddings and LLManiilhr/agentic-ai-rag-chatbot · 2026-09-29
- fix: preserve image parts in OpenAI to Gemini responsesmoeacgx/NewAPI-Mao · 2026-09-27
- Updating from OpenAI to Gemini in llm.py following the potential toke…harpand87/banking-support-agent · 2026-09-27
- Switch the assistant LLM from OpenAI to Geministariik/Mia · 2026-09-26
- port(upstream): #4274 - disambiguate colliding tool call ids in openai to geminibloodf/durindoor · 2026-09-25
- feat(gemini): convert OpenAI Embeddings to Gemini embeddingstbphp/gpt-load · 2026-09-25
- Switch AI provider from OpenAI to Google GeminiOricrew/service-scheduler · 2026-09-24
OpenAI API → Claude127 PRs
- Migrate AI provider from OpenAI to Anthropic Claudesawthunaing/stn-job-hunting-dashboard-with-ai · 2026-10-01
- Preserve readable context when switching owned OpenAI to ClaudeJJLiebig/codex · 2026-10-01
- Add OpenAI Codex plugin marketplace to Claude Code project settingsbrandohermoso47-rgb/cliente-vault-web-app · 2026-10-01
- Switch Wardrobe from OpenAI to Claudenjarrar/wardrobe-najeeb · 2026-09-28
- Switch receipt extraction from OpenAI to Claudebelindahbl/receipt-telegram-bot · 2026-09-26
- Switch AI copy from OpenAI to Claude Haiku 4.5fareeha-s/shouldve-walked · 2026-09-26
- Phase 1: Switch AI provider from OpenAI to Anthropic Claudeanfaznil/tabletalk-ai · 2026-09-23
- fix(thinking): route OpenAI and level-based reasoning models to claude-adaptive on Claude endpointshkbulbul/polyrouter · 2026-09-23
- Switch FAQ replies from OpenAI to Anthropic Claudeimranaisolutions/Agentic-Ai · 2026-09-23
- Switch AI provider from OpenAI to Claude, and hand redirects to AJR Core (4.1.0)andrew-ajrwebdesign/ai-seo-assistant · 2026-09-22
OpenAI API → Groq50 PRs
- Switch eval pipeline LLM provider from OpenAI to Groqgsarthakdev/llm-eval-pipeline · 2026-09-15
- Migrate LLM backend from OpenAI GPT-4 to Groq (openai/gpt-oss-120b)Blandskron/pentest-agent · 2026-09-09
- Switch LLM provider from OpenAI to GroqkarMareal1/WhyUs · 2026-09-04
- feat(clips): switch Whisper and chat from OpenAI to Groqasgard02/vyrll · 2026-08-16
- changed from openai to groq because no way I'm paying to openai for a…ubturja/Is-It-For-Real · 2026-08-15
- Revert AI assistant LLM provider from OpenAI back to Groq (free tier)mudone1/Tdislogistics · 2026-08-10
- Swap transcription provider from OpenAI to GroqF-NAN-AI-ENGINEERING-RESIDENCY/compass · 2026-08-03
- Rename OpenAI provider to Groq providerKutlay07/ai-assistant-platform · 2026-07-31
- Task 1 done Migrate completely from OpenAI to GroqQuantumLogicsLabs/RepoMind · 2026-07-27
- Switch AI provider from OpenAI to GroqShiveshDragon/Benefit_Bridge · 2026-07-25
OpenAI API → DeepSeek23 PRs
- Talk to any OpenAI-compatible server next to DeepSeek: Ollama, llama.cpp, LM Studio, vLLM or a cloud service of your ownmike13kohler/OpenGhost · 2026-09-29
- feat(ai): move Lead Finder AI from OpenAI to OpenRouter DeepSeek V4.1 FlashMonarchLabsLLC/Pipe-LeadFinder · 2026-09-24
- feat(llm): swap the chat models from OpenAI to DeepSeekMetnmatEnergy/METNMAT-chatbot · 2026-09-17
- Switch from OpenAI to DeepSeek API and add new articletangyuan233/clip · 2026-09-05
- Switch ICP scorecard assist from OpenAI to DeepSeekhamdi0712/spine-scale-crm · 2026-08-07
- Migrate the PR reviewer from codex/OpenAI to DeepSeekbrandon-fryslie/slopspot-paste · 2026-07-01
- Switch RAG chat LLM from OpenAI to DeepSeektaashchikosi/AI_Portfolio_Projects · 2026-06-13
- Enhance OpenAI-compatible chat clients to DeepSeek paritynvdigitalsolutions/mcp-ai-wpoos · 2026-06-09
- Switch tutor status-draft from OpenAI to DeepSeek V4 Flashzakaria-bennis/Karman-Prep · 2026-05-31
- feat: switch AI provider from OpenAI to DeepSeekNikNik516-1/tg-sales-bot · 2026-05-28
OpenAI API → Mistral AI9 PRs
- Migrate runtime from OpenAI to Mistral and add Mistral transports, analyzers and harnessesarnaudconnan-svg/acp-chat · 2026-08-29
- docs: switch LLM provider from Anthropic/OpenAI to MistralBimsara-Yehan/ChemSentry · 2026-08-18
- Migration from openAI to MistralZering-Max/tepsia-chatbot · 2026-08-10
- fix(ai): switch rag-eval from OpenAI to Mistral (credits exhausted)andrelair-platform/minicloud-gitops · 2026-08-02
- Migrate from OpenAI to Mistral, add reliability, idempotency, telemetry, and runbooksAbdulmuiz44/SayReady · 2026-03-21
- fix: switch CI LLM from OpenAI to Mistral MAASrossoctl/rossoctl · 2026-03-03
- fix: add mergeToolResultText for OpenAI provider to fix Mistral tool message orderingRooCodeInc/Roo-Code · 2026-01-13
- change openai to mistral ai as llm apiOscar-Hirsch/newsPortal · 2025-06-19
- Change openAI to Mistral in text about VCsalkem-io/client-web · 2025-03-12
Alternatives to OpenAI API
All alternatives by situation →On Product Hunt, people weigh it against: Mistral AI, Claude, MiniMax, Grok API, Gemini API, Eden AI.
Questions makers ask about OpenAI API
Does OpenAI train its models on what I send through the API?
No, not by default. Data sent to the API has not been used for training since March 1, 2023, unless you explicitly opt in to share it. source ↗
How long does OpenAI keep my prompts and outputs?
By default, abuse-monitoring logs that can include prompts and responses are kept for up to 30 days, and the Responses API stores response objects for at least 30 days unless you set store to false. Zero Data Retention and Modified Abuse Monitoring exist, but they require OpenAI's prior approval. source ↗
Can I keep my data in the EU or another region?
Yes, if you are eligible, which is decided through sales. Data residency is set per project, stores customer content at rest in the chosen region, and in some regions also runs inference there. Non-US regions also require approval for abuse-monitoring controls. source ↗
Can I use it for health data under HIPAA?
Only after signing OpenAI's Business Associate and Healthcare Addendum and having your organization provisioned for it. PHI can then go only through BAA-eligible endpoints; web search with live internet access, for example, isn't covered. source ↗
How do rate limits work for a new account?
Limits apply per organization and per project, not per user, and are measured in requests and tokens per minute and per day. As your total paid spend grows, OpenAI moves you up usage tiers automatically, which raises your limits and your monthly usage cap. source ↗
Is there a cheaper way to run large offline jobs?
Yes. The Batch API takes a .jsonl file of requests, finishes within 24 hours, and costs half as much as the same calls made synchronously. source ↗
Which languages have an official SDK?
JavaScript/TypeScript (Node.js, Deno, Bun), Python, .NET, Java, Go and Ruby. Java and Go are labeled beta, and there are official Agents SDKs for TypeScript and Python. source ↗
Should I build on Chat Completions or the Responses API?
OpenAI recommends Responses for all new projects. It adds built-in tools and optional server-side conversation state, while Chat Completions remains supported. source ↗
Is OpenAI API free?
No permanent free tier; paid use starts at Pay per token. source ↗
Is OpenAI API open source or self-hostable?
Not open source, and hosted only.
Can AI coding agents work with OpenAI API?
It serves an llms.txt docs index; Lovable, Replit set it up natively.
Who uses OpenAI API?
734 makers' products we track, each with a source, and 481 open-source projects declare it in their code. source ↗