GPT-5.3-Codex

reasoningdeprecatedproprietary

Status: Deprecated · Succeeded by gpt-6-sol

Intelligence
Reasoning
Speed
Context
400K
Max output
128K
Input price
$1.75/1M tokens
Output price
$14/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode
Infrastructure
Streaming

Details

Provider OpenAI
Creator openai
Familygpt-5.3
Licenseproprietary
Statusdeprecated
Typereasoning
Input modalitiestext, image
Output modalitiestext
Open weightNo
Parameters—
Architecture—
Context window400K tokens
Max input272K tokens
Max output128K tokens
Reasoning tokensYes
Knowledge cutoff
Release date—
Deprecation date
Retirement date
Successorgpt-6-sol
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs
Web Searchweb_search
Search the web for information
Hosted Shellhosted_shell
Run shell commands in a container
Skillsskills
Use built-in skill modules

Endpoints

ResponsesPOST
Stateful multi-turn conversationshttps://api.openai.com/v1/responses

Pricing

Text tokensPer 1M tokens
InputCached inputOutput
Standard$1.75$0.175$14

Family Comparison: gpt-5.3

ModelContextMax outPricing
GPT-5.3 Chat128K16K$1.75$14
GPT-5.3-Codex400K128K$1.75$14

API

GET/v1/models/openai/gpt-5.3-codex