FlexAI

FlexAI serves models through an OpenAI-compatible API. Use promptfoo's OpenAI provider with FlexAI's endpoint and API key.

FlexAI documents its data handling in its privacy policy and terms of service.

Setup

Create a key on the FlexAI platform and set FLEXAI_API_KEY in your shell, or load it from a file with --env-file.

providers:
  - id: openai:chat:DeepSeek-V4-Flash-0731
    config:
      apiBaseUrl: https://api.flex.ai/v1
      apiKeyEnvar: FLEXAI_API_KEY
      headers:
        OpenAI-Organization: ''
      omitDefaults: true
      temperature: 0
      max_tokens: 4096
      showThinking: false
      passthrough:
        reasoning_effort: low

apiBaseUrl overrides OpenAI endpoint environment variables. apiKeyEnvar selects only FLEXAI_API_KEY; a missing key does not fall back to OPENAI_API_KEY. The empty OpenAI-Organization header overrides any inherited OPENAI_ORGANIZATION value.

Configuration

• omitDefaults: true omits promptfoo's default output limit and temperature. Explicit settings and OPENAI_MAX_TOKENS / OPENAI_TEMPERATURE still apply; the example sets temperature: 0 explicitly.
• Use max_tokens to cap output, including reasoning tokens. If you leave it unset and have no OPENAI_MAX_TOKENS, FlexAI chooses the limit. Increase it if reasoning consumes the budget before an answer appears.
• Put reasoning_effort under passthrough to send it to FlexAI regardless of model-name detection. FlexAI maps supported effort levels to each model's controls.
• showThinking: false excludes reasoning text from the answer used by assertions.

Check the model catalog or GET https://api.flex.ai/v1/models for current model IDs. See the compatibility reference for supported parameters and pricing for current rates.

Embeddings

Use FlexAI's bge-m3 model for similarity assertions:

defaultTest:
  options:
    provider:
      embedding:
        id: openai:embedding:bge-m3
        config:
          apiBaseUrl: https://api.flex.ai/v1
          apiKeyEnvar: FLEXAI_API_KEY
          headers:
            OpenAI-Organization: ''

Example

The provider-flexai example compares two chat models and uses FlexAI embeddings for grading with the same API key.