E52E feat: add OpenAI compatible image generation support by freinold · Pull Request #382 · presenton/presenton · GitHub
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feat: add OpenAI compatible image generation support #382

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feat: add OpenAI compatible image generation support #382

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@freinold
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@freinold freinold commented Dec 24, 2025 •
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Description

This PR introduces a new image provider openai_compatible that allows users to connect to any OpenAI-API-compatible image generation endpoint (e.g., LiteLLM, vLLM, Azure OpenAI, or self-hosted gateways). This feature decouples image generation from the text LLM provider, offering greater flexibility for enterprise and self-hosted deployments where image generation might be handled by a separate proxy or service.

Key Changes

  • New Provider: Added openai_compatible to the ImageProvider enum.
  • Configuration: Introduced new environment variables to configure the provider independently:
    • OPENAI_COMPAT_IMAGE_BASE_URL
    • OPENAI_COMPAT_IMAGE_API_KEY
    • OPENAI_COMPAT_IMAGE_MODEL (Strictly required, no default)
  • Implementation: Implemented generate_image_openai_compatible method in ImageGenerationService, utilizing the standard AsyncOpenAI client with a custom base_url.
  • Validation: Added strict validation to ensure all required configuration parameters (URL, Key, Model) are present before attempting generation.
  • Tests: Added tests/test_image_generation_openai_compatible.py with comprehensive unit tests for provider selection, successful generation, and error handling for missing config.
  • Documentation: Updated README.md with the new provider options and a specific "Using an OpenAI-Compatible Image Provider" configuration example.

How to Test

  1. Run the backend tests: uv run pytest servers/fastapi/tests/test_image_generation_openai_compatible.py.
  2. Start the server with the following environment variables: 
    IMAGE_PROVIDER=openai_compatible
OPENAI_COMPAT_IMAGE_BASE_URL=https://api.openai.com/v1 # or your proxy URL
OPENAI_COMPAT_IMAGE_API_KEY=sk-proj-....
OPENAI_COMPAT_IMAGE_MODEL=dall-e-3
  3. Generate a presentation and verify that images are generated using the specified endpoint.

Checklist

  • Code compiles and runs
  • Tests added/updated (test_image_generation_openai_compatible.py)
  • Documentation updated (README.md)
  • [~] Dependencies updated (not applicable)

Closes #381

@freinold
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freinold commented Jan 6, 2026

@sauravniraula @surajbeston @ShivaRajBadu @sudipnext

Could one of you please review these changes?

@papandadj
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papandadj commented Jan 20, 2026

@sauravniraula @surajbeston @ShivaRajBadu @sudipnext
Could anyone review that?. This is very useful feature.

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Feature request: Custom OpenAI-compatible Image Generation endpoint (LiteLLM / OpenAI proxy) support

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