GPT Image 2.5 vs Gemini 3.1 Flash Image: price per 1K image
fal lists GPT Image 2.5 at $0.05268 per 1024x1024 high image; Google lists Gemini 3.1 Flash Image at about $0.067 per 1K image.
At about 1K resolution, GPT Image 2.5 at its default high quality is cheaper than Gemini 3.1 Flash Image on the vendors' list prices: fal lists $0.05268 per 1024x1024 image, and Google lists roughly $0.067 per 1K image. GPT Image 2.5 low ($0.00588) and medium ($0.01317) are far below either. On Sume, which bills list x 1.25, the GPT high image is about $0.066.
What each page says
Google's Gemini API page lists Gemini 3.1 Flash Image at $60 per million output image tokens, about $0.045 per 512px image and $0.067 per 1K image, and Gemini 3.1 Flash Lite Image at about $0.0336 per 1K image. fal's GPT Image 2.5 page lists five quality tiers with a per-image table. Sume is shown for GPT only, because Sume's image docs were not checked for Gemini image rows here.
| Model | Setting | Price per image |
|---|---|---|
| GPT Image 2.5 (fal) | low, 1024x1024 | $0.00588 |
| GPT Image 2.5 (fal) | medium, 1024x1024 | $0.01317 |
| GPT Image 2.5 (fal) | high, 1024x1024 | $0.05268 |
| Gemini 3.1 Flash Lite Image (Google) | 1K | about $0.0336 |
| Gemini 3.1 Flash Image (Google) | 1K | about $0.067 |
Read it carefully
A price per image is only half the comparison: GPT Image 2.5's cost grows with quality tier and longer prompts, while Google's figure is an approximation from tokens. Test the same prompt on both and compute cost per image you keep. The Sume GPT ladder, including 4K, is in the full table.
Sources
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