OpenAI: GPT-5.1-Codex vs OpenAI: GPT-5.4 Pro

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

SpecOpenAI: GPT-5.1-CodexOpenAI: GPT-5.4 Pro
ProviderOpenAIOpenAI
Context Length400K1.1M
Max Output128K128K
Input Price/1M$1.25$30
Output Price/1M$10$180
Cache Read/1M$0.13Free
Cache Write/1MFreeFree
Input ModalitiesText + ImageText + Image + File
Output ModalitiesTextText
TokenizerGPTGPT
ModeratedYesYes
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