lex-llm-openai

LegionIO LLM provider extension for Openai.

This gem lives under Legion::Extensions::Llm::Openai and depends on lex-llm for shared provider-neutral routing, fleet, and schema primitives.

What It Provides

• LexLLM::Provider registration as :openai
• chat completions through POST /v1/chat/completions
• streaming chat completions through the same chat completions endpoint
• model discovery through GET /v1/models
• model retrieval through GET /v1/models/{model}
• embeddings through POST /v1/embeddings
• moderation through POST /v1/moderations
• image generation through POST /v1/images/generations
• image editing through POST /v1/images/edits
• image variation endpoint helper for POST /v1/images/variations
• audio transcription through POST /v1/audio/transcriptions
• shared OpenAI-compatible request/response mapping via LexLLM::Provider::OpenAICompatible
• shared fleet/default settings via Legion::Extensions::Llm.provider_settings

Defaults

Legion::Extensions::Llm::Openai.default_settings
# {
#   provider_family: :openai,
#   instances: {
#     default: {
#       endpoint: "https://api.openai.com",
#       tier: :frontier,
#       transport: :http,
#       credentials: { api_key: "env://OPENAI_API_KEY" },
#       usage: { inference: true, embedding: true, moderation: true, image: true, audio: true },
#       limits: { concurrency: 4 }
#     }
#   }
# }

Configuration

LexLLM.configure do |config|
  config.openai_api_key = ENV.fetch("OPENAI_API_KEY")
  config.default_model = "gpt-5.2"
  config.default_embedding_model = "text-embedding-3-small"
  config.default_moderation_model = "omni-moderation-latest"
  config.default_image_model = "gpt-image-1"
  config.default_transcription_model = "gpt-4o-transcribe"
end