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The user notes that the impact of selecting different LLMs (e.g., GPT-5.4 Thinking vs GPT-5.4 Pro) on the output of GPT-imagegen-2 is not intuitive or explained. They request better documentation or clearer explanations to help users understand and make informed choices about which LLM to use for optimal image generation results, especially for complex tasks.
This wasn't the case with previous image generators, but the LLM you select has a huge effect on GPT-imagegen-2 output. GPT-5.4 Thinking and GPT-5.4 Pro will produce much better images, especially for complex things. This is, of course, not intuitive or explained anywhere.