GPT 5.3 Codex

proprietary

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

Model IDgpt-5.3-codex
Provider OpenCode Zen
Creator OpenAI
Familygpt-5.3
Licenseproprietary
Statusactive
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

Pricing

Input
$1.75
Output
$14
Cache write
—
Cache read
$0.18
Batch in
—
Batch out
—

Family Comparison: gpt-5.3

ModelContextMax outPricing
GPT 5.3 Codex Spark——$1.75$14
GPT 5.3 Codex400K128K$1.75$14

API

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