Overview
Analysis
Seedream 5.0 Pro vs Nano Banana 2 (Gemini 3.1 Flash Image) vs GPT Image 2.5 Sunburst: side-by-side summary
Seedream 5.0 Pro, Nano Banana 2 (Gemini 3.1 Flash Image), and GPT Image 2.5 Sunburst are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Seedream 5.0 Pro, from bytedance-seed, is priced from $0.045/image on OpenRouter.
Nano Banana 2 (Gemini 3.1 Flash Image), from Google, has a 131,072-token context window and is priced at $0.50/M tokens input, $60/M tokens output on OpenRouter.
GPT Image 2.5 Sunburst, from OpenAI, is priced at $8/M tokens input, $30/M tokens output on OpenRouter.
| Attribute | Seedream 5.0 Pro | Nano Banana 2 (Gemini 3.1 Flash Image) | GPT Image 2.5 Sunburst |
|---|---|---|---|
| Context window | Not applicable | 131,072 tokens | Not applicable |
| Price | from $0.045/image | $0.50/M tokens input, $60/M tokens output | $8/M tokens input, $30/M tokens output |
| Provided by | bytedance-seed | OpenAI | |
| Model page | Seedream 5.0 Pro model details, providers and pricing | Nano Banana 2 (Gemini 3.1 Flash Image) model details, providers and pricing | GPT Image 2.5 Sunburst model details, providers and pricing |