gpt-5.3-codex

deprecatedproprietary

Status: Deprecated

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 Vercel AI Gateway
Creator OpenAI
Familygpt-5.3
Licenseproprietary
Statusdeprecated
Typechat
Input modalitiestext
Output modalitiestext
Open weightNo
Parameters—
Architecture—
Context window400K tokens
Max input272K tokens
Max output128K tokens
Reasoning tokensYes
Knowledge cutoff
Release date—
Deprecation date
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Pricing

Input
$1.75
Output
$14
Cache write
—
Cache read
—
Batch in
—
Batch out
—

Family Comparison: gpt-5.3

ModelContextMax outPricing
gpt-5.3-chat128K—$1.75$14
gpt-5.3-codex400K128K$1.75$14

API

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

gpt-5.3-codex

deprecated

Status: Deprecated

Changes · 3 entries
openai/gpt-5.3-codexupdateb301ebeMar 23, 2026, 11:47 PM
modalitiesinput["text"]output["text"]
openai/gpt-5.3-codexupdate2b100acMar 23, 2026, 05:30 AM
model_typechat
tools["function_calling"]
openai/gpt-5.3-codexcreate7f5c66fMar 21, 2026, 05:16 AM