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Requirements

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Magic Post Thumbnail needs:

  • WordPress 6.0 or newer (tested up to WordPress 7.0.4)
  • PHP 7.3 or newer

The plugin runs in the WordPress admin only. It does not load on the front of the site, so it does not affect visitor-facing cache plugins.

 

API keys and the chain #

Which keys you need depends on the Automatic generation chain on Source.

  • Bing Images has no API key. Heavy use can hit rate limits; space out bulk jobs if Bing stops returning results.
  • First image in content needs an image already in the post.
  • Default image needs a media file chosen in that bank’s settings.
  • Other photo and AI banks need their own API key. Status badges on Source: Ready, No key, Untested, Key OK, Key failed.

AI generation typically takes 10 to 90 seconds and uses the provider’s credits (OpenAI, Ideogram, xAI, Google, Replicate, Stability, and so on).

Source Automatic generation chain with key status badges

Dashboard health #

Open Magic Post Thumbnail → Dashboard. Your configuration shows Ready to generate or Needs attention. It checks the chain, API keys, image placement and Brand overlay. Use Generate a test image when the first bank is ready.

See Dashboard.

Dashboard Your configuration Ready to generate or Needs attention

Performance #

Admin impact is low until you generate. Photo searches are usually a few seconds. AI calls are slower (often 20–90 seconds for GPT Image). PHP GD is required if you enable Brand overlay.

There is no special front-office tuning to do with caching plugins.

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