OpenAI: GPT-5.3 Chat

OpenAIID: openai/gpt-5.3-chat

GPT-5.3 Chat is an update to ChatGPT's most-used model that makes everyday conversations smoother, more useful, and more directly helpful. It delivers more accurate answers with better contextualization and significantly reduces unnecessary refusals, caveats, and overly cautious phrasing that can interrupt conversational flow.

Pricing per 1M Tokens

Input (Prompt)$1.75
Output (Completion)$14
Cache Read$0.17
Cache WriteFree
ImageN/A

Specifications

Context Length128K
Max Output Tokens16K
Input ModalitiesText + Image + File
Output ModalitiesText
TokenizerGPT
Instruct TypeN/A
Top Provider Context128K
Top Provider Max Output16K
ModeratedYes

Compare this model

See how OpenAI: GPT-5.3 Chat stacks up against other models.

vs OpenAI: GPT-5.4 Nanovs OpenAI: GPT-5.4 Minivs OpenAI: GPT-5.4 Provs OpenAI: GPT-5.4vs OpenAI: GPT-5.3-Codex

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Last updated: March 23, 2026

First tracked: March 23, 2026