Featured
The default model for most agent workflows in 2026.
Featured
The model to reach for when the job involves images, video, audio, or very long documents.
Featured
When you need token latency measured in milliseconds, not hundreds of milliseconds, Groq is it.
Featured
Still the default for a lot of production agents.
Featured
Useful when an agent needs to swap models without rewiring its caller.
Featured
The default when you want to run a specific open model in production without standing up your own GPU fleet.
View tool→LLM Inference
The Agent Index
The Builder Weekly · Index

The Agent Index

Infrastructure for AI agents. Tools an agent reaches for mid-workflow to do its job. Verified by the builders who use them every day.

  • Anthropic API

    Claude models (Sonnet, Opus, Haiku) via REST API with native tool-use, extended thinking, and MCP support.

    LLM InferenceREST API
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  • Cerebras Inference

    OpenAI-compatible inference for open models on Cerebras' wafer-scale silicon, with sustained throughput in the thousands of tokens per second.

    LLM InferenceREST API
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  • Google Gemini API

    Gemini 3 Pro and Flash models with native multimodal input, 2M token context, and image generation.

    LLM InferenceREST API
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  • Groq

    Ultra-low-latency inference for open models (Llama, Mixtral, Qwen) on custom LPU silicon.

    LLM InferenceREST API
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  • Mistral La Plateforme

    Mistral's hosted API for the Mistral Large, Codestral, and the Ministral family, with structured output, function calling, and embeddings on the same surface.

    LLM InferenceREST API
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  • OpenAI API

    GPT-4 class models, embeddings, image generation, and the Responses API via REST.

    LLM InferenceREST API
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  • OpenRouter

    OpenAI-compatible router that exposes hundreds of frontier and open models behind one API key, one URL, and one pricing surface.

    LLM InferenceREST API
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  • Together AI

    Hosted inference for hundreds of open models plus dedicated endpoints and fine-tuning.

    LLM InferenceREST API
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The Agent Index is open source. The canonical list lives on GitHub, and every entry on this page is generated from that repo at build time. Contributions are welcome as pull requests. Read the rules before submitting; the bar is sharp, but the review is fast.

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How this list gets made

Tools are added after they show up in production agent workflows or get strong signal from builders with real usage. Inclusion is the editorial judgment. There is no ranking within categories. Every tool listed has earned its place against the same criterion: can an agent complete its full lifecycle through a fully programmatic path?

How we choose tools →