GPT-5.3-Codex
Agentic coding model optimized for Codex or similar environments.
Specs
- Context
- 400K
- Max output
- 128K
- Input price
- $1.75/ 1M tokens
- Output price
- $14/ 1M tokens
- Released
- 2026-02-24
Context
- Context window
- 400K
- Max input
- 272K
- Max output
- 128K
Pricing · USD / 1M tokens
- Input
- $1.75
- Output
- $14
- Cache read
- $0.175
- Cache write
- —
Modalities
- Input
- TextImage
- Output
- Text
API
- API types
Reasoning
- Reasoning
- Yes
- Levels
Info
- Status
- Deprecated
- Released
- 2026-02-24
- Knowledge cutoff
- 2025-08-31
Features
- Confirmed
How to call
1 provider
openaimodel = gpt-5.3-codexreasoning = reasoning.effort
responses
POSThttps://api.openai.com/v1/responses
JSON
Standard format
{
"id": "gpt-5.3-codex",
"object": "model",
"created": 1771891200,
"owned_by": "openai",
"name": "GPT-5.3-Codex",
"api": {
"types": [
"responses"
]
},
"limits": {
"context": 400000,
"input": 272000,
"output": 128000
},
"modalities": {
"input": [
"text",
"image"
],
"output": [
"text"
]
},
"reasoning": {
"supported": true,
"efforts": [
"low",
"medium",
"high",
"xhigh"
]
},
"pricing": {
"currency": "USD",
"unit": "1M_tokens",
"input": 1.75,
"output": 14,
"cache_read": 0.175,
"cache_write": null
},
"features": [
"tools",
"structured_output",
"streaming",
"caching"
],
"info": {
"status": "deprecated",
"release_date": "2026-02-24",
"knowledge_cutoff": "2025-08-31",
"description": "Agentic coding model optimized for Codex or similar environments.",
"docs": "https://developers.openai.com/api/docs/models/gpt-5.3-codex",
"verified_at": "2026-10-11"
}
}Official sources
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