GPT Image 2.5 Sunburst vs Nano Banana 2.1

GPT Image 2.5 Sunburst from OpenAI and Nano Banana 2.1 from Google, side by side. Every figure comes from the model registry. No markup on model usage: you pay the provider's list price.

Side-by-side comparison of GPT Image 2.5 Sunburst, Nano Banana 2.1

Attribute	GPT Image 2.5 Sunburst	Nano Banana 2.1
Provider	OpenAI	Google
Model id	openai/gpt-image-2.5-sunburst	google/gemini-nano-banana-2.1
Status	Available via Safeguard	Available via Safeguard
Input / 1M tokens	$5	$1.50
Output / 1M tokens	$30	$30
Price notes	Token-priced. Input shown is text input ($5/1M), image input is $8/1M, image output $30/1M. Text output is not billed.	Output price is for image output tokens ($30/1M, about $0.0336 per 1K image, $0.0504 per 2K, $0.113 per 4K). Text and thinking output $7.50/1M.
Context	Not published	131K
Parameters	Not published	Not published
Max output	Not published	32,768 tokens
Modality	Image generation	Image generation
Weights	Closed	Closed
Zero data retention	Available	Not offered
Prompts go to	OpenAI (no processing-region constraint by default)	Google (Gemini Developer API)
Retention	API data not used for training unless you opt in, abuse monitoring logs that can include prompts and responses kept up to 30 days by default, some features store application state	Paid tier: prompts and responses not used to improve Google products, but logged for a limited period for abuse monitoring, free tier content may be used to improve products
Region	Global by default, data residency projects in US, EU and other regions (approval required, 10% uplift for models released on or after 2026-03-05)	No region guarantee, data may be stored transiently or cached in any country where Google operates. Google points ZDR and enterprise processing needs to Vertex AI (Gemini Enterprise Agent Platform)
Price checked	2026-10-08	2026-10-08

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