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

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

SpecOpenAI: GPT-5 CodexOpenAI: GPT-5.3 Chat
ProviderOpenAIOpenAI
Context Length400K128K
Max Output128K16K
Input Price/1M$1.25$1.75
Output Price/1M$10$14
Cache Read/1M$0.13$0.17
Cache Write/1MFreeFree
Input ModalitiesText + ImageText + Image + File
Output ModalitiesTextText
TokenizerGPTGPT
ModeratedYesYes
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