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Description
GPT-5.3 Chat is OpenAI's general-purpose conversational model with a 128k token context window, positioned between the older GPT-5.2 generation and the newer GPT-5.4 frontier series.
OpenAI's frontier model for complex professional workloads. 1M token context, text + image input, native computer use.
I/O price /1M
$1.75/$14.00
$5.00/$30.00
Input /1M
$1.75
$5.00
Output /1M
$14.00
$30.00
Cached in /1M
$0.175
$0.5
Context
128K
1M
Δ input since launch
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—
Δ output since launch
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Released
Mar 2026
Apr 2026
Status
—
—
Provider
OpenAI
OpenAI