LLM APIs - Directory w/ AI Reviews

Large language models need reliable API access to be integrated into products and workflows. Anthropic's API provides access to the Claude family of models with a focus on safety and instruction-following. OpenAI's API remains the most widely integrated, offering GPT-4o and earlier models. Together AI and Groq offer access to open-weight models with optimized inference, while Google AI Studio provides a playground and API for Gemini. LangChain and Ollama sit above these APIs as abstraction and local-serving layers.

OpenAI API Platform 1 4.9 New OpenAI API Platform Paid API Enterprise 2 reviews The OpenAI API Platform is the most widely adopted LLM API in the industry, providing access to GPT-4o, o1, o3, and other models through RESTful endpoints that have become the de facto standard for LLM API integration. Its chat completions format is replicated by numerous third-party providers, maki Anthropic API 2 4.8 New Anthropic API Paid API Enterprise 3 reviews The Anthropic API is one of the leading LLM API providers, offering programmatic access to the Claude family of models through RESTful endpoints. It supports chat completions, vision, tool use, structured output, and extended thinking with context windows up to 200,000 tokens, serving developers bui Google AI Studio 3 4.8 New Google AI Studio Free Free Plan API Enterprise 3 reviews Google AI Studio provides free API access to Google's Gemini models with generous rate limits, making it one of the most accessible LLM API platforms available. Developers can generate API keys and access Gemini 2.0 Flash, 1.5 Pro, and other models through RESTful endpoints compatible with multiple Groq 4 4.8 New Groq Freemium Free Plan API Enterprise 3 reviews Groq provides one of the fastest LLM inference APIs available, serving popular open-source models at speeds several times faster than GPU-based alternatives. Its OpenAI-compatible API supports chat completions, function calling, and streaming, making it ideal for latency-sensitive applications. Together AI 5 4.7 New Together AI Paid API Enterprise 2 reviews Together AI provides API access to a wide catalog of open-source language models with OpenAI-compatible endpoints, competitive pricing, and fast inference speeds. Developers can access models like LLaMA, Mistral, and DeepSeek through a standardized API with support for streaming, function calling, a LangChain 6 4.5 New LangChain Free Free Plan Open Source Enterprise 3 reviews LangChain provides a unified interface for accessing dozens of LLM APIs through standardized abstractions. Developers can switch between OpenAI, Anthropic, Google, Mistral, local models, and other providers with minimal code changes, making it a versatile middleware layer for LLM API consumption. Ollama 7 4.4 New Ollama Free Free Plan Open Source 2 reviews Ollama exposes a local REST API compatible with the OpenAI chat completions format, enabling developers to interact with locally-running models using the same API patterns used with cloud LLM providers. This makes it a free, private alternative to cloud-based LLM APIs for development and testing. Replicate 8 4.2 New Replicate Paid API Enterprise 2 reviews Replicate offers API access to numerous large language models including LLaMA, Mistral, and other open-source LLMs. Developers can run these models via a simple REST API with streaming support, paying only for compute time used, making it a flexible alternative to dedicated LLM API providers.