It's more expensive than Gemini flash which can actually write pretty decent code (not just apply a diff). Fast AI edit application is definitely great but that's pretty expensive

Morph v3 fast: Input: $1.20 / M tokens, Output $2.70 / M tokens

Gemini 2.5 Flash: $0.30 / M tokens, Output $2.50 / M tokens

(Source: OpenRouter)