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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...

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GPT-5.3 Chat FAQ

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DeprecatedOPOpenAI/ GPT

GPT-5.3 Chat

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...

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Model family

GPT

-

Focus areas

ReasoningGenerative AI

Core specifications

Released
2026-03-03
Context window
128K
Max output
16K
Weights
Closed

Modalities

Input
DocumentImageText
Output
Text

Identity

Version
gpt-5.3-chat
Aliases
GPT-5.3 Chat (latest)

Capabilities

AttachmentsStructuredTemperatureTool call

Pricing

IN $1.75/M
OUT $14/M
Read $0.175/M

Capabilities and fit

Model summary

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...

Text
AttachmentsStructuredTemperatureTool call
Output
Text
Capabilities
4
Catalog updated
2026-03-20T00:00:00.000Z
Status
Deprecated

Provider coverage

ProviderInputOutputPricing
LLM Gateway
IN $1.75/M
OUT $14/M
Read $0.175/M
Abacus
IN $1.75/M
OUT $14/M
Read $0.175/M
OrcaRouter
IN $1.75/M
OUT $14/M
Read $0.175/M
Merge Gateway
IN $1.75/M
OUT $14/M
Read $0.175/M
OpenAI
IN $1.75/M
OUT $14/M
Read $0.175/M
OpenRouter
GPT-5.3 Chat
IN $1.75/M
OUT $14/M
Read $0.175/M
ZenMux
GPT-5.3 Chat
IN $1.75/M
OUT $14/M
Read $0.175/M
Kilo Gateway
OpenAI: GPT-5.3 Chat (retires Aug 10)
IN $1.75/M
OUT $14/M
Read $0.175/M
Vercel AI Gateway
GPT-5.3 Chat
IN $1.75/M
OUT $14/M
Read $0.175/M

FAQ