GPT-5.3 Chat

deprecated

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...

128K context·$1.75 in·$14.00 out·Mar 2026 release·Vision, Tools / functions, Web search

Available on

OpenRouter

Providers

Where GPT-5.3 Chat runs in Big-AGI, with each service's own model ID and USD-per-1M-token rates. The summary above prefers the creator's claim; rates below are each service's own.

ServiceModel IDContextInputOutputCache read

OpenRouter

delisted

openai/gpt-5.3-chat

128K

$1.75

$14.00

$0.18

Specs as reported by each service · usage over the last 2 days · refreshed hourly