Today I am delighted to share with you our enhanced CustomGPT API Suite — the #1 serverless RAG API on both accuracy and anti-hallucination (in independent benchmarks!)
Rather than building RAG pipelines yourself, this API allows you to quickly build RAG-based solutions with just a few lines of code.
You then get production-ready, best-in-class performance and features (no kidding — we’ve added 964 features/issue fixes in the platform over the last 12 months alone, which says a lot about how the platform works!)
Learn More: Introducing the CustomGPT API – the #1 Serverless RAG API.
Why integrate CustomGPT.ai API?
- Our low-code API allows you to seamlessly integrate powerful AI into your existing products, solutions, and workflows.
- #1 in RAG accuracy and anti-hallucination (in independent benchmarks)
- Production-ready at a fraction of the cost of building in-house. (this is what we do!)
How it works
- We’ve packaged the entire RAG pipeline into an easy-to-use serverless platform.
- No more dealing with vector databases, accuracy, anti-hallucination and the 964 other features/issues needed in a RAG pipeline.
- We’ve made this production-ready and low-cost so that you can immediately deploy in your workflows and applications.
What you can build
- AI / RAG Agents: Build custom agents that can act on your knowledge (like websites, documents, videos, etc)
- AI-Powered Knowledge Discovery: Transform your knowledgebases into smart conversations — allowing you to drive revenue and cut costs.
- Easy Integrations: Integrate RAG-powered AI into your existing products, solutions, and workflows.
What our customers say
“We chose CustomGPT.ai because for us, it had the best spectrum of quality of answers, ease of use, scalability, and most importantly, CustomGPT.ai API capabilities. We have many internal processes that rely on an automated connection to CustomGPT.ai and its API offers great value.” Prof. Dr. Michael Kraus, AI Expert at Dlubal
Get started today
- Get Your API Key — Free trial included.
- Explore the Documentation — Start integrating in minutes.
👉 Start Building → https://app.customgpt.ai/login
Want to connect with other CustomGPT.ai users and discuss developer API resources? Join our Slack Community to share insights and best practices.
FAQs
Why can’t I just build this with LangChain?
You can. LangChain is a useful framework if your team wants to build and maintain the full RAG stack yourself. CustomGPT.ai is for teams that want production-ready RAG without spending months on ingestion, retrieval tuning, security, hosting, and evaluation. If you are deciding between build vs. buy, these guides may help:
- Build vs Buy: The AI Implementation Guide
- Build It or Buy It? Generative AI’s Million Dollar Question
- LangChain is not for production use. Here is why
Why wouldn’t I just build a RAG system myself?
You can build your own RAG system, but it takes time, engineering resources, and ongoing maintenance. CustomGPT.ai’s RAG API helps you launch in minutes instead of months, with optimized retrieval, ingestion, citations, and security already handled. That lets your team focus on your product instead of rebuilding RAG infrastructure.
What kind of data do I need to provide?
You can use business content such as websites, sitemaps, PDFs, documents, help center articles, FAQs, product information, support logs, and other knowledge sources your agent should answer from.
How can I start testing the RAG API?
You can test API calls directly from our documentation hub using your active CustomGPT.ai projects. Start with the API docs before going live.
How often is the RAG API updated?
We regularly improve the API with new features, retrieval improvements, and customer feedback. We aim to keep changes backward compatible so existing integrations continue working.
How do I get started with the CustomGPT.ai RAG API?
Create a CustomGPT.ai account, generate an API key, and follow the API quickstart guide. The docs show how to create projects, upload data, query agents, and manage responses.
What are the API rate limits?
Rate limits depend on your plan and are designed to keep the API reliable for all users. You can monitor usage in your dashboard. If you need higher limits, our team can help you choose the right plan.
How do I handle API errors?
Our API documentation explains common errors, what they mean, and how to fix them. If an issue persists, our support team can help troubleshoot.
Can I customize RAG API responses?
Yes. You can adjust your agent’s behavior and tone using Persona settings. You can also use the API to add your own logic, workflows, or application-specific data around the CustomGPT.ai response.
What data formats does the RAG API support?
CustomGPT.ai supports a wide range of file types, plus websites and sitemaps. API responses are returned in JSON, making them easy to use in apps, dashboards, workflows, and internal tools. See the API docs for examples.
Is your code open source?
Our Python SDK is open source, and we provide cookbook examples for common use cases. The CustomGPT.ai application and RAG system are proprietary.
Is my data secure with CustomGPT.ai?
Yes. CustomGPT.ai is SOC 2 Type II certified. Data is encrypted in transit and at rest, and agents are isolated from each other. By default, agents are private and can only be accessed by authorized users. You can read more on our security page.
What support is available?
All plans include email support. Enterprise customers get additional support, including help with onboarding, integrations, troubleshooting, and optimization.
How do I integrate CustomGPT.ai with my systems?
You can integrate CustomGPT.ai through the API or use existing integrations where available. Our team can help with setup and implementation. See our integrations page.
How does CustomGPT.ai ensure accurate responses?
CustomGPT.ai is built around retrieval from your approved sources, citations, and ongoing RAG pipeline improvements. Our agents are tested against benchmarks and continuously optimized to improve answer accuracy and reduce hallucinations.
Build smarter with the #1 serverless RAG API
The CustomGPT API gives you serverless, production-ready RAG performance — accurate, scalable, and easy to integrate in minutes.
Trusted by 10,000+ organizations worldwide
Related Resources
If you’re evaluating production-ready retrieval, this guide expands on the API capabilities discussed above.
- Enterprise RAG API — Explore how CustomGPT.ai supports enterprise-grade retrieval-augmented generation with scalable API access and deployment considerations.