OpenAI: o3 Pro vs OpenAI: GPT-5.3 Chat

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

SpecOpenAI: o3 ProOpenAI: GPT-5.3 Chat
ProviderOpenAIOpenAI
Context Length200K128K
Max Output100K16K
Input Price/1M$20$1.75
Output Price/1M$80$14
Cache Read/1MFree$0.17
Cache Write/1MFreeFree
Input ModalitiesText + File + ImageText + Image + File
Output ModalitiesTextText
TokenizerGPTGPT
ModeratedYesYes
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OpenAI: o3 Pro vs OpenAI: GPT-5.3 Chat -- AI Model Comparison | AIToolRank