Together AI

Together AI provides access to open-source models through an API compatible with OpenAI's interface.

OpenAI Compatibility

Together AI's API is compatible with OpenAI's API, which means all parameters available in the OpenAI provider work with Together AI.

Basic Configuration

Configure a Together AI model in your promptfoo configuration:

providers:
  - id: togetherai:deepseek-ai/DeepSeek-V4-Flash-0731
    config:
      temperature: 0.7

Set TOGETHER_API_KEY, or configure apiKey directly. Use apiKeyEnvar to select a different process environment variable. Provider env overrides take precedence only for registered keys such as TOGETHER_API_KEY; custom names in provider env are not retained by config validation.

Connection options such as apiBaseUrl, apiHost, and headers configure the transport. Model parameters are sent to Together AI, and explicit passthrough fields override top-level model parameters.

Embeddings

The togetherai:embedding:<model> route sends embedding requests to Together AI's default API. Together AI currently lists no serverless embedding models; check the dedicated model catalog for deployment availability.

Dedicated deployments use a separate base URL and an endpoint string as the model. For a dedicated embedding deployment, use openai:embedding:<your-project-slug/endpoint-name> with config.apiBaseUrl: https://api-inference.together.ai/v1 and config.apiKeyEnvar: TOGETHER_API_KEY. See Together AI's dedicated inference request guide.

Key Features

Max Tokens Configuration

config:
  max_tokens: 4096

Function Calling

config:
  tools:
    - type: function
      function:
        name: get_weather
        description: Get the current weather
        parameters:
          type: object
          properties:
            location:
              type: string
              description: City and state

JSON Mode

config:
  response_format: { type: 'json_object' }

Current Serverless Models

Together AI's serverless catalog changes frequently. These selected current chat model IDs are useful starting points:

Model ID	Context (tokens)
moonshotai/Kimi-K3	1,048,576
deepseek-ai/DeepSeek-V4-Pro-0813	1,048,576
deepseek-ai/DeepSeek-V4-Flash-0731	1,048,576
Qwen/Qwen3.6-Plus	1,000,000
thinkingmachines/Inkling	524,288
zai-org/GLM-5.2	1,048,575
MiniMaxAI/MiniMax-M3	524,288
Qwen/Qwen3.5-9B	262,144
openai/gpt-oss-120b	131,072
meta-llama/Llama-3.3-70B-Instruct-Turbo	131,072

Check Together AI's recommended models, live serverless catalog, and deprecation history before pinning a model in a long-lived configuration.

Example Configuration

providers:
  - id: togetherai:deepseek-ai/DeepSeek-V4-Flash-0731
    config:
      temperature: 0.7
      max_tokens: 4096

  - id: togetherai:moonshotai/Kimi-K3
    config:
      temperature: 1.0
      response_format: { type: 'json_object' }
      tools:
        - type: function
          function:
            name: get_weather
            description: Get weather information
            parameters:
              type: object
              properties:
                location: { type: 'string' }
                unit: { type: 'string', enum: ['celsius', 'fahrenheit'] }

For more information, refer to the Together AI documentation.