Gemini 3.1 Flash Image vs GPT-Image-2.5-Sunburst

A side-by-side comparison of Gemini 3.1 Flash Image and GPT-Image-2.5-Sunburst: input/output pricing, capabilities and available endpoints, served live from J8API. Both are reachable with the same API key.

Pricing comparison

ItemGemini 3.1 Flash ImageGPT-Image-2.5-Sunburst
Input (per 1M tokens)$0.375$3.5
Output (per 1M tokens)$2.25$21
Cache read explicit (per 1M tokens)—$0.875

Capability comparison

ItemGemini 3.1 Flash ImageGPT-Image-2.5-Sunburst
vision—Yes

Which should you pick

Which is cheaper, Gemini 3.1 Flash Image or GPT-Image-2.5-Sunburst?

On input, Gemini 3.1 Flash Image is cheaper ($0.375 vs $3.5 per 1M tokens). On output, Gemini 3.1 Flash Image is cheaper ($2.25 vs $21 per 1M tokens). All prices are per million tokens in USD.

What can Gemini 3.1 Flash Image do that GPT-Image-2.5-Sunburst cannot?

only GPT-Image-2.5-Sunburst supports vision.

Can I switch between Gemini 3.1 Flash Image and GPT-Image-2.5-Sunburst without changing my code?

Yes. Both are available on J8API through one API key and the same OpenAI-compatible endpoint — switching means changing the model field from "gemini-3.1-flash-image" to "gpt-image-2.5-sunburst", nothing else.

Both are available on J8API under one API key — switching between them means changing the model field and nothing else, so you can use each where it fits rather than picking one.

Gemini 3.1 Flash Image · GPT-Image-2.5-Sunburst · All models