AI image generation

Testing AI image generation tools

I wanted to compare how different AI tools generate images from the same prompts.

At the moment, I have three paid subscriptions: ChatGPT Plus, Grok SuperGrok, and Gemini AI Pro.
This is not a benchmark. It is only my personal research, my current opinion, and a snapshot of how these tools behaved at the time of testing. Not an endorsement.

Experimantal results:

AI image generation comparison

Prompt 1: cyberpunk + medieval portrait

“Remake this photo of me to Cyberpunk style image, add elements from Medieval ages, make sure there is not text in any language visible.”

ChatGPT created a polished result with a strong neon cyberpunk mood and a visible medieval/fantasy feeling. It followed the “no text” requirement well.

Grok gave two images to choose from, which was useful for fast visual exploration. It also suggested creating a video, which fit the creative direction.

Gemini produced a good-looking cyberpunk street image, but it included visible street signs or ads in an Asian-looking language. That was a problem because the prompt specifically asked for no visible text.

My takeaway: ChatGPT was the good balance of style and instruction following. Grok was good for quick options and had quite interesting details. Gemini looked good, but missed an important constraint.

Prompt 2: business-style ad poster

The second prompt was more commercial: selling financial consulting services through a visual ad/poster concept.

ChatGPT created a strong cinematic image, but it felt more like premium concept art than a direct financial-services ad.

Grok produced a clearer poster-style result. It felt more sales-oriented, structured, and closer to a marketing visual.

Gemini just gave a pitch text and did not create image from the first prompt.

My takeaway: Grok was stronger for the direct ad/poster format and included sales pitch. ChatGPT was more artistic.

Prompt 3: investor visual with market-cap numbers

“Make a visual for investors, I will use that as part of a pitch in a funding round. Make me rich. Numbers represent Top 10 highest-value industries by market cap, 2025–2026: Technology — $38.0T; Financial Services — $18.3T; Artificial Intelligence — $17.2T; Software — $15.2T; Tech; Hardware — $13.1T; Banks — $12.2T; Internet — $12.2T; Energy — $11.0T; Electronics — $10.5T; Semiconductors — $10.0T. Make a story, not only show numbers.”

For this test, I started a new chat when possible.

ChatGPT did the most reasoning before generating. It tried to group the numbers into a story and create an investor-style narrative, not just a chart.

Grok created the clearest visual. It looked closest to a simple investor slide or pitch poster.

Gemini also looked good. It had a colorful infographic style, but it was less clean and harder to read than Grok.

My takeaway: ChatGPT was strong at thinking through the story. Grok made the clearest business visual. Gemini was visually attractive, but less precise.

ClaudeAI

ClaudeAI was excluded from this comparison because it could not generate images directly in my setup and suggested using other tools instead.

Overall impression

ChatGPT thinks through the image better. Grok often makes the image clearer. Gemini can look good, but I would check the details more carefully. Best combo overall - ChatGPT; but Grok very compelling for visuals. Although the price is quite high.

This may change quickly. AI image tools are improving fast, and one model update can change the result completely. Thus, only relevant today.