# FastRouter.ai

> FastRouter.ai is a fast, reliable, and scalable LLM gateway that routes prompts to 100+ top models, including GPT-4.1, Claude 4 Opus, Gemini 2.5 Pro, Grok 4, Veo 3, and GPT Image 1 through a single OpenAI-compatible API. It enables dynamic routing, instant failover, cost-aware usage, and seamless integration for text, image, video, audio, and tool-calling models.

Core capabilities include:
- **Auto Routing**: Reduce cost and latency by routing requests to the best model dynamically
- **Unified API**: OpenAI-compatible interface for 100+ models across text, image, video, audio, and speech
- **Instant Failover**: Auto-switch providers on outage or rate-limit detection
- **Custom Model Lists**: Choose which models are available per project or call
- **Cost Control**: Real-time limits by project, user, or key
- **BYOK or Hosted Keys**: Use your credentials or tap FastRouter’s high-limit keys

Free credits to start. No setup, no monthly minimums, no credit card.

## Models

- [GPT-4.1 (OpenAI)](https://fastrouter.ai/models/openai/gpt-4.1)  
- [Claude 4 Opus (Anthropic)](https://fastrouter.ai/models/anthropic/claude-3-opus-20240229)  
- [Gemini 2.5 Pro (Google)](https://fastrouter.ai/models/google/gemini-2.5-pro)  
- [Grok 4 (xAI)](https://fastrouter.ai/models/x-ai/grok-4)  
- [Veo 3 (Google)](https://fastrouter.ai/models/google/veo3)  
- [GPT Image 1 (OpenAI)](https://fastrouter.ai/models/openai/gpt-image-1)  
- [LLaMA 3.3 & 4 (Meta)](https://fastrouter.ai/models/meta-llama/llama-3.3-70b-versatile)  
- [Qwen3-235B (Alibaba)](https://fastrouter.ai/models/Qwen/Qwen3-235B-A22B)  
- [DeepSeek Prover V2](https://fastrouter.ai/models/deepseek-ai/DeepSeek-Prover-V2-671B)  
- [DALL·E 3 (OpenAI)](https://fastrouter.ai/models/openai/dall-e-3)  
- [Mixtral, Mistral, Sonar, Seedance, and more](https://fastrouter.ai/models)

→ Full model catalog: [fastrouter.ai/models](https://fastrouter.ai/models)

---

## Quick Start

- [Quickstart](https://docs.fastrouter.ai/explore-features/quickstart): Get up and running with your first routed request

---

## Explore Features

- [Automatic Model Selection](https://docs.fastrouter.ai/explore-features/automatic-model-selection)  
- [Custom Model Lists](https://docs.fastrouter.ai/explore-features/custom-model-lists)  
- [Fallback Models](https://docs.fastrouter.ai/explore-features/fallback-models)  
- [Provider Routing Strategies](https://docs.fastrouter.ai/explore-features/provider-routing-strategies)  
- [Organization and Members](https://docs.fastrouter.ai/explore-features/organization-and-members)  
- [Credits Management](https://docs.fastrouter.ai/credits)  
- [Provisioning Keys](https://docs.fastrouter.ai/provisioning-keys)  
- [File & Image Inputs](https://docs.fastrouter.ai/file-and-image-inputs)  
- [Dynamic Tags Per Request](https://docs.fastrouter.ai/dynamic-tags-per-request)  
- [Projects Overview](https://docs.fastrouter.ai/projects)  
- [Key Management](https://docs.fastrouter.ai/keys-and-settings)  
- [BYOK (Bring Your Own Key)](https://docs.fastrouter.ai/byok-bring-your-own-key)

---

## API Reference

- [Chat Request API](https://docs.fastrouter.ai/api-reference/chat-request-api)  
- [Image Request API](https://docs.fastrouter.ai/api-reference/image-request-api)  
- [Transcription / Translation API](https://docs.fastrouter.ai/api-reference/transcriptions-and-translations-api)  
- [Text-to-Audio API](https://docs.fastrouter.ai/api-reference/text-to-audio-generation-api)  
- [Video Generation API](https://docs.fastrouter.ai/api-reference/video-generation-api)  
- [Embeddings API](https://docs.fastrouter.ai/api-reference/embeddings-api)  
- [Function Calling API](https://docs.fastrouter.ai/function-calling)  
- [Structured Outputs](https://docs.fastrouter.ai/structured-outputs)  
- [List Available Models](https://docs.fastrouter.ai/api-reference/list-models-api)  
- [Raw Request Forwarding](https://docs.fastrouter.ai/api-reference/request-generation-api)  
- [Error Codes](https://docs.fastrouter.ai/api-reference/error-codes)

---

## Advanced

- [Web Search](https://docs.fastrouter.ai/web-search): Integrate web search as a tool within completions  
- [IDE Integrations](https://docs.fastrouter.ai/integrations/ide-integrations): Use FastRouter in local dev environments

---

## Optional

- [LLM Model Terms](https://fastrouter.ai/llm-model-terms): Attribution & provider compliance  
- [Privacy Policy](https://fastrouter.ai/privacy)  
- [Terms of Use](https://fastrouter.ai/terms)      
- [Contact](https://fastrouter.ai/contact)