Alternatives to LLMTornado

OnAPI is a unified AI API gateway that routes GPT, Claude, Gemini, Sora, Veo and Banana models through one key and one bill.

Guidance is an open-source Python library for constrained LLM generation with regex, context-free grammars, and inline control flow.

Go SDK for AI apps: one type-safe API for text generation, streaming, tools and MCP across 25+ LLM providers.

A headless React hooks library that runs Vicuna-13B chat entirely in your browser via WebGPU, with no prompt or completion leaving the client.

MIT-licensed Swift package for calling the OpenAI API with native async/await and Combine on Apple platforms.

Open-source TypeScript AI SDK for streaming AI apps and agents across 100+ models with built-in fallbacks

Outlines enforces structured LLM output during decoding, so JSON, regex, and grammar-constrained generations come back valid on the first

Agnes AI puts text, image and video generation behind one OpenAI-compatible API — free to start.

OpenAI Cookbook delivers free, MIT-licensed Python notebooks and guides for building with the OpenAI API.

Pioneer is a self-improving inference API that routes every call to the right model and retrains itself from your production traffic.

Mellea turns type-annotated Python functions into validated, testable LLM calls with token-level constrained decoding.

Not Diamond is a beta routing layer that picks, per prompt, which large language model is most likely to answer it well.

xsAI is an extra-small, OpenAI-compatible AI SDK for JavaScript and TypeScript — 13 KB gzipped with every package included.

GPTProto is a unified AI API that routes 200+ text, image, and video models through one OpenAI-compatible key at 10–30% below official

Rig is a Rust LLM framework for building type-safe AI agents across 20+ model providers with one unified API.

Open-source Java library that puts a unified LLM and vector store API inside your JVM app

Open-source Ruby gem that calls 11 LLM providers through one consistent interface for embeddings, completions, and chat.

Open-source Django library for adding LLM assistants, chat, RAG, and Tool Calling to your existing app

Mirascope is an open-source Python library that turns LLM calls, tools, and prompt versioning into plain decorated functions.

Blackbox AI encrypted inference: route 300+ models through one endpoint with end-to-end encryption and zero data retention.

BAML is a type-safe language for structured LLM output that compiles to typed Python and TypeScript SDKs.

Pydantic AI is the typed Python agent SDK: declare a model string and a Pydantic output type, get validated structured results on every run.

Novita AI runs 200+ open-weight LLMs, image, audio and video models through one serverless API, plus GPU cloud and an Agent Sandbox.

OpenUI turns AI agent responses into streaming, interactive UI built from your own component library.

Open-source Java library that tokenizes text with OpenAI's BPE encodings so you can count, encode and decode locally

Open-source Rust library for building streaming, parallel LLM pipelines — data indexing, retrieval-augmented generation, and autonomous agents.

Python agent framework for small language models — local engines, OpenAI-compatible servers, or hosted providers, with tool-call tracing

Fenic turns messy text into typed, queryable Semantic DataFrames with LLM-powered extraction, classification, and semantic joins in Python.

Open-source JavaScript library that runs small LLMs like Llama 3.2 1B Instruct inside the browser via WebAssembly and WebGPU.

RubyLLM is the Ruby-native AI framework: 19 providers, one API for chat, agents, tools, and RAG.