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GPT-5.3 Codex (xhigh)

![OpenAI](https://artificialanalysis.ai/img/logos/openai_small.svg)OpenAI
54/ 57

Intelligence Score

Intelligence

54

#8 of 212 (top 4%)

Speed

93 tok/s

#76 of 141

Price

$4.81

per M tokens

#129 cheapest of 142

Context Window

400K

tokens

Latency: 76ms (#139)

Score Breakdown

Quality Score90%
Speed Score12%
Cost Score57%

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Use This Model

Claude Code

claude --model gpt-5-3-codex

API (cURL)

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

Vercel AI SDK

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

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