Providers

Native wire protocols have their own request mappers:

  • Gateway (AI_GATEWAY_API_KEY) posts V4 call options to /language-model, /embedding-model, and /image-model.
  • OpenAI speaks Chat Completions, the Responses API, embeddings, images, speech, and transcription.
  • Anthropic speaks the Messages API. AnthropicAwsProvider points that body at the AWS external endpoint.
  • Google speaks Gemini generateContent. GoogleVertexProvider changes the base URL and sends a bearer token.
  • Azure OpenAI uses api-key and /openai/deployments/{model}/chat/completions.
  • Amazon Bedrock signs a Converse request with Signature Version 4.
  • Cohere speaks chat, embed, and rerank.
  • OpenResponses posts to {base}/responses. The default base is the Gateway Open Responses route.

OpenAI-compatible providers (Alibaba, Groq, DeepSeek, Mistral, xAI, and the others) are thin wrappers over Vercel.AI.OpenAICompatible. They set the base URL, the provider id, and the environment variable.

Speech, transcription, image, video, and Voyage each have a package that calls that provider’s public HTTP API. Use SpeechModel, TranscriptionModel, ImageModel, VideoModel, or EmbeddingModel rather than LanguageModel.

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