Request help with LLM Framework

[Whitecoolman]

Hi, seniors
Hope you are doing well

I'm so stressed out trying to find a good LLM framework.
I tried Langchain, but at least for me, it didn't work.

I'd like to have a good framework that's perfect for both development and performance.

What's the latest LLM framework?

Please help me🙏

[john-zulhelmi]

Hi @Whitecoolman
It depends on your business needs.

Please note:

vercel-ai-sdk vs llama index vs openrouter

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Vercel AI SDK vs. LlamaIndex vs. OpenRouter

Aspect	Vercel AI SDK	LlamaIndex	OpenRouter
Core Purpose	Developer SDK focused on building AI-powered frontend apps with streaming and event handling features.	Data ingestion, indexing, and retrieval augmented generation (RAG) framework for building AI applications with extensive data connectors.	Unified API gateway for multi-model and multi-provider AI access with optimized routing and cost-performance management.
Key Features	- Streaming intermediate events for enhanced UX - Integration with frontend frameworks - Event-driven architecture for real-time updates	- Rich data connectors (100+ sources) - Index and retriever abstractions for complex querying - Router for query engine selection - Supports multimodal documents	- Standardized API across dozens of models/providers - Smart routing for price, latency, availability - Consolidated billing - Provider fallback and high rate limits
Best Use Cases	Interactive AI applications requiring real-time feedback and frontend integration (e.g., chatbots with streaming responses).	Retrieval-centric AI applications requiring robust data indexing, multi-source querying, and knowledge synthesis.	Applications needing flexible access to multiple LLM providers/models with cost and performance optimization.
Integration Focus	Frontend developer experience, streaming data to UI, event handling.	Backend data pipelines, document indexing, and retrieval workflows. Integrates with LangChain, ChatGPT plugins, vector stores.	Backend API abstraction layer for multi-provider LLM usage, with seamless model switching.
Open Source / Ecosystem	SDK provided by Vercel with growing community and tooling.	Open-source with active ecosystem, extensive documentation, and integrations.	Open-source API gateway with active community and real-time usage insights.
Unique Strength	Smooth streaming of intermediate events to frontend, improving user experience in complex RAG workflows.	Powerful indexing and retrieval framework enabling sophisticated knowledge-driven AI applications.	Multi-provider model routing and cost-performance optimization with consolidated billing and failover.

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Please share your project ideas or needs with me and I will help you.

Best luck

[Whitecoolman]

Cool!
Everything is clear

Thanks a ton 🙇‍♂️