LLM APIs
This category focuses on current developer APIs with enough official documentation to verify authentication, request surfaces, model access, and core capabilities.
Selection criteria
- Provides documented programmatic access to current language models
- Has an official API reference or developer documentation
- Supports workflows relevant to AI applications or coding agents
Editorial layer
Featured entities
Featured entries are curated separately from the automatic graph aggregation below.
OpenAI API
OpenAI API provides programmatic access to OpenAI models through the Responses API, Realtime API, batch processing, and other model and media endpoints.
Claude API
Claude API is Anthropic's REST API for programmatic access to Claude models, including Messages, streaming, tool use, files, model listing, and related platform features.
Gemini API
Gemini API provides programmatic access to Google's Gemini and related generative models through standard, streaming, real-time, batch, embeddings, and media endpoints.
OpenRouter API
OpenRouter API is an OpenAI-compatible model-routing API that exposes hundreds of models from many providers through a single endpoint and account.
DeepSeek API
DeepSeek API provides access to the current DeepSeek V4 models through OpenAI-compatible and Anthropic-compatible interfaces.
Direct members
Tools
Direct members
Agents
Graph expansion
Models and APIs
Includes indexed models and APIs directly assigned to the category or connected to its tools and agents by verified usage, integration, power, or availability relationships.
APIs
Claude API
Claude API is Anthropic's REST API for programmatic access to Claude models, including Messages, streaming, tool use, files, model listing, and related platform features.
DeepSeek API
DeepSeek API provides access to the current DeepSeek V4 models through OpenAI-compatible and Anthropic-compatible interfaces.
Gemini API
Gemini API provides programmatic access to Google's Gemini and related generative models through standard, streaming, real-time, batch, embeddings, and media endpoints.
Groq API
Groq API is an OpenAI-compatible inference API for supported language and audio models, with Responses, Chat Completions, streaming, tool use, structured output, and speech endpoints.
Mistral API
Mistral API provides programmatic access to Mistral models, chat completions, agents, tool use, structured outputs, embeddings, document workflows, and batch processing.
OpenAI API
OpenAI API provides programmatic access to OpenAI models through the Responses API, Realtime API, batch processing, and other model and media endpoints.
OpenRouter API
OpenRouter API is an OpenAI-compatible model-routing API that exposes hundreds of models from many providers through a single endpoint and account.
xAI API
xAI API provides programmatic access to Grok models through OpenAI-compatible REST endpoints and xAI's gRPC interface, with text, tool, media, file, and batch APIs.
Provider graph
Providers
Organizations linked to the category's tools, agents, models, or APIs through verified develops, provides, operates, or owns relationships.
Anthropic
Anthropic is an AI research and product company that develops Claude models, the Claude API, and products including Claude Code.
DeepSeek
DeepSeek develops language models, an API platform, and agent-oriented model tooling, including hosted DeepSeek V4 models and open-weight DeepSeek V3 and R1 research families.
Google develops internet, cloud, developer, and AI products, including the Gemini model and developer-tool product family.
Groq
Groq operates an inference cloud and API for running supported language, audio, and agent-oriented models on Groq infrastructure.
Mistral AI
Mistral AI develops language models and operates Studio, its developer platform for model APIs, agents, document processing, and related AI workloads.
OpenAI
OpenAI is an AI research and deployment company that develops model, developer, and coding products including the Codex product family.
OpenRouter
OpenRouter operates a model-routing platform and unified API for accessing models from multiple AI providers through one account and endpoint.
SpaceXAI
SpaceXAI develops the Grok model family and operates the xAI API. xAI joined SpaceX in February 2026.
Research layer
Comparisons
Published comparisons are included when at least one compared entity is a direct member of this category or a model/API reached through its verified graph connections.
DeepSeek API vs OpenAI API
DeepSeek API and OpenAI API both support the OpenAI Responses request style. DeepSeek additionally documents an Anthropic-compatible base URL, while OpenAI exposes a broader first-party set of realtime and media endpoints.
Gemini API vs OpenAI API
Gemini API and OpenAI API both expose multimodal models, streaming, tool use, batch processing, and official SDKs. Their primary request primitives and authentication schemes differ.
Groq API vs OpenRouter API
Groq API and OpenRouter API both expose OpenAI-compatible model access. Groq runs a selected model catalog on its inference cloud, while OpenRouter routes requests across many model providers.
OpenAI API vs Claude API
OpenAI API and Claude API both provide model access, streaming, tool use, and official SDKs. They differ in API surface, model catalog, authentication details, and supported media and realtime endpoints.
OpenRouter API vs OpenAI API
OpenRouter API is a multi-provider routing layer with an OpenAI-compatible interface, while OpenAI API is OpenAI's first-party platform for its own models and developer services.
xAI API vs OpenAI API
xAI API and OpenAI API both expose Responses-style and OpenAI-compatible developer workflows, with different model catalogs, server-side tools, media endpoints, and transport options.