GPT 5.3 Codex
GPT 5.3 Codex is the GPT-5.3 generation of OpenAI's coding agent models, advancing autonomous software engineering with GPT-5.3 generation improvements in reasoning and code comprehension. Your use is subject to OpenAI's Terms & Privacy Policies.
ReasoningTool UseFile InputVision (Image)Web SearchImplicit CachingHas Fast ModeWebsockets
import { streamText } from 'ai'
const result = streamText({ model: 'openai/gpt-5.3-codex', prompt: 'Why is the sky blue?'})Copy link to headingMore models by OpenAI
| Model |
|---|
| 1.1M | 1.4s | 203tps | $0.20/MFast $0.40/M+1 more | $1.20/MFast $2.40/M+1 more | Read: $0.02/M+1 more Write: $0.25/M+1 more | $10/K + input costs | +4 |    | 07/09/2026 | |||||
| 1.1M | 2.4s | 119tps | $4/M$2/M Fast $4/M+1 more | $20/M$10/M Fast $20/M+1 more | Read: $0.40/M$0.20/M+1 more Write: $5/M$2.50/M+1 more | $10/K + input costs | +4 | | 07/09/2026 | |||||
| 1.1M | 1.8s | 109tps | $2/MFast $4/M+1 more | $12/MFast $24/M+1 more | Read: $0.20/M+1 more Write: $2.50/M+1 more | $10/K + input costs | +4 | | 07/09/2026 | |||||
| 1.1M | 1.8s | 92tps | $2.50/MFast $5/M+1 more | $15/MFast $30/M+1 more | Read: $0.25/M+1 more Write: — | $10/K + input costs | +4 | | 03/05/2026 | |||||
| 400K | 3.7s | 188tps | $0.05/M | $0.40/M | Read:$0.005/M Write:— | $14/K + input costs | +3 | | 08/07/2025 | |||||
| 400K | 3.6s | 195tps | $0.25/MFast $0.45/M | $2/MFast $3.60/M | Read:$0.03/M Write:— | $14/K + input costs | +3 | | 08/07/2025 |