Nano Banana 2 (Gemini 3.1 Flash Image) vs Step 3.7 Flash: side-by-side summary

Nano Banana 2 (Gemini 3.1 Flash Image) and Step 3.7 Flash are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

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, $3/M tokens output on OpenRouter.

Step 3.7 Flash, from stepfun, has a 262,144-token context window and is priced at $0.20/M tokens input, $1.15/M tokens output on OpenRouter.

Context window

• Nano Banana 2 (Gemini 3.1 Flash Image): 131,072 tokens
• Step 3.7 Flash: 262,144 tokens

Price

• Nano Banana 2 (Gemini 3.1 Flash Image): $0.50/M tokens input, $3/M tokens output
• Step 3.7 Flash: $0.20/M tokens input, $1.15/M tokens output

Provided by

• Nano Banana 2 (Gemini 3.1 Flash Image): Google
• Step 3.7 Flash: stepfun

• Nano Banana 2 (Gemini 3.1 Flash Image) model details, providers and pricing
• Step 3.7 Flash model details, providers and pricing