Cost of 1,000 AI images: GPT Image 2.5, Ideogram 4.5, Nano Banana Pro

At list prices, 1,000 square images cost between $5.88 and $210.72 on GPT Image 2.5 depending on quality, $30 to $220 on Ideogram 4.5, and $134 on Nano Banana Pro at 1K or 2K. Those are provider lists, not Sume prices. Use them to pick a tier, then read the live pricing line for the model on Sume's Image API before you commit a budget.

List prices side by side

GPT Image 2.5 is token-based, so the figure below is the output estimate for 1024x1024 only. Ideogram 4.5 is flat per quality tier, "the image size does not change the price" in Fal's words. Nano Banana Pro is $120 per million output tokens at Google, which Google converts to a flat figure per image at 1K/2K.

What is and isn't in those numbers

The GPT rows leave out input tokens: text at $5 per million and input images at $8 per million per Fal's page. A one-line text prompt adds almost nothing, but an edit with 4 reference photos adds input image tokens whose count Sume says it estimates. The Ideogram and Google rows are the full per-image list figures.

Sume then applies its own pricing, and the docs say the endpoint pricing lines are the amount charged to your wallet, so cost_usd times n is the figure that matters.

How to turn this into a plan

• Exploring styles: GPT Image 2.5 low or Ideogram 4.5 low, then promote winners.
• Text on the image matters: Ideogram 4.5 medium and GPT Image 2.5 medium or high are the tiers to compare on your own prompts.
• Large 4K outputs: Nano Banana Pro rises to $0.24 at 4K per Google; GPT Image 2.5 at 3840x2160 is $0.01113 to $0.40026 in output tokens.
• Failed generations are not billed on Sume, so a retry of a failed call costs nothing extra.

Check it with one call

Ask the catalog for the number instead of trusting a blog table. The endpoint record returns the billable lines per model.

GET /v1/images/models/openai/gpt-image-2.5/endpoints returns a pricing array. Send your actual quality and size in a test call with n: 1 and read usage.cost from the response; that is the billed USD amount for the call.