OpenAI: GPT-5 Nano vs OpenAI: GPT-5.3 Chat

Side-by-side model comparison based on OpenRouter API data.

SpecOpenAI: GPT-5 NanoOpenAI: GPT-5.3 Chat
ProviderOpenAIOpenAI
Context Length400K128K
Max Output128K16K
Input Price/1M$0.05$1.75
Output Price/1M$0.40$14
Cache Read/1M<$0.01$0.17
Cache Write/1MFreeFree
Input ModalitiesText + Image + FileText + Image + File
Output ModalitiesTextText
TokenizerGPTGPT
ModeratedYesYes
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