GPT-5.3 Chat chat

openrouter
openai
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.

Capabilities

Context Window 128k tokens
Max Output 16k tokens
Inputs
Outputs

Pricing (per 1M tokens)

Input $1.75
Output $14.00
Cache Read $0.17
Cache Write -

Supported Parameters

max_tokensresponse_formatseedstructured_outputstool_choicetools

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