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GPT-5.3 Codex (xhigh)

OpenAI
54/ 57

Intelligence Score

Intelligence

54

#3 of 210 (top 1%)

Speed

65 tok/s

#93 of 148

Price

$4.81

per M tokens

#132 cheapest of 144

Context Window

400K

tokens

Latency: 97ms (#143)

Score Breakdown

Quality Score95%
Speed Score10%
Cost Score52%

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Use This Model

Claude Code

claude --model gpt-5-3-codex

API (cURL)

curl https://api.openai.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -d '{
    "model": "gpt-5-3-codex",
    "messages": [{"role": "user", "content": "Hello"}]
  }'

Vercel AI SDK

import { generateText } from "ai";
import { openai } from "@ai-sdk/openai";

const { text } = await generateText({
  model: openai("gpt-5-3-codex"),
  prompt: "Hello",
});
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