Grok Imagine Image vs GPT Image 1.5 becomes useful once both models face the same prompts for text, counting, reflections, and poster layouts under equal conditions.
Models in this comparison
Test setup
- 5 prompts. Same text for both models.
- 1 sample per prompt.
- Portrait outputs: Grok used 9:16 at 2K. GPT used 2:3 at medium quality.
- Run time measured from task completion times.
| Model | Avg time per image (5 runs) | Notes |
|---|---|---|
| Grok Imagine Image | ~10s | Strong cinematic contrast. Very clean reflections. |
| GPT Image 1.5 | ~22s | Sharp detail. Often a bit more literal on typography. |
Prompt tests
Prompt 1: Product photo with label text
Prompt: Studio product photo of a clear glass cold brew bottle on a white seamless background. The label shows the exact text NIGHT SHIFT on the first line and COLD BREW on the second line. Clean sans serif, centered, crisp. Softbox reflections, 85mm lens, sharp focus, high detail.
Grok Imagine Image
GPT Image 1.5
Both nailed legible text. Grok looked more like a premium studio shoot. GPT went for a flatter, catalog style.
Prompt 2: Exact object list and counting
Prompt: Top-down flat lay photo on a pale stone table. Exactly 2 red pencils, 3 silver paper clips, 1 lemon, and 4 yellow sticky notes. Arrange them in a spiral. Soft natural light, sharp focus, realistic.
Grok Imagine Image
GPT Image 1.5
Grok stayed physically believable. GPT introduced bent pencils that look impossible. This prompt punishes small geometry mistakes.
Prompt 3: Rainy neon street action
Prompt: Photorealistic scene of a cyclist crossing a rainy neon-lit street at night. Puddles with colorful reflections, motion blur on the wheels, sharp raindrops in streetlights, cinematic framing, high detail.
Grok Imagine Image
GPT Image 1.5
Both hit the brief. Grok delivered the stronger movie look. GPT looked real but less dramatic.
Prompt 4: Poster layout with typography
Prompt: Minimalist travel poster illustration for REYKJAVIK. Background: snowy mountains and a small town under the northern lights. Big title text REYKJAVIK at top, small tagline RING ROAD WINTER below. Clean layout, paper texture, limited palette.
Grok Imagine Image
GPT Image 1.5
Both handled title and subtitle well. GPT leaned into a classic printed-poster look. Grok looked cleaner and more modern.
Prompt 5: Hard reflections and tiny engraving
Prompt: Ultra realistic photo of a transparent glass chess set on a mirrored table in a sunlit room. Caustic light patterns, soft depth of field, a curious cat in the background. The king piece has a tiny engraving that reads E4. High detail, natural colors.
Grok Imagine Image
GPT Image 1.5
GPT pulled ahead on sharp micro-detail. Grok looked more atmospheric and wide-angle. Both kept the E4 engraving readable.
Takeaways
- Grok Imagine Image won 3 out of 5 prompts here, mostly on realism and cinematic lighting.
- GPT Image 1.5 looked strongest on poster styling and close-up detail work.
- For strict physical plausibility, Grok stayed cleaner on this set.
- For typography-driven designs, GPT produced a more cohesive printed poster vibe.
Try both models here: Grok Imagine Image and GPT Image 1.5.
