GPT-5.3-Codex
openai/gpt-5.3-codex
GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2.
Key facts
- Input price
- $1.75 / 1M tokens
- Output price
- $14.00 / 1M tokens
- Context window
- 400K tokens
- Max output
- 128K tokens
- Accepts
- Text, Images, Files
- Returns
- Text
Example: 1,000 requests with 1,000 input and 500 output tokens each would cost about $8.75 (1M input tokens × $1.75 + 0.5M output tokens × $14.00). Estimate your own usage.
Prices are the provider’s own per-token rates with zero markup, from our price list as of Oct 18, 2026. If a call has extra provider charges (images, audio, web search, cached prompts), you pay the reported cost.
Call it from your code
curl https://api.tokenctr.com/v1/chat/completions \
-H "Authorization: Bearer $TOKENCENTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model": "openai/gpt-5.3-codex", "messages": [{"role": "user", "content": "Hello!"}]}'Works with any OpenAI-compatible SDK: set the base URL to https://api.tokenctr.com/v1. Quickstart
Benchmarks
Artificial Analysis
- Intelligence index
- 32.5
Design Arena
| Category | Rank | Elo | Win rate |
|---|---|---|---|
| Agents: Godot game dev | 27 | 1124 | 45.1% |
| Agents: Android native | 30 | 1084 | 35.2% |
| Agents: Web apps | 40 | 1026 | 36.9% |
| Models: ASCII art | 41 | 1154 | 51.2% |
| Agents: Full-stack | 42 | 983 | 36.5% |
| Agents: Mobile apps | 44 | 1051 | 41.4% |
| Models: SVG | 54 | 1127 | 54% |
| Models: Game dev | 68 | 1164 | 51.3% |
| Models: Data visualization | 72 | 1165 | 50.6% |
| Models: Websites | 80 | 1164 | 48.6% |
| Models: UI components | 81 | 1137 | 47.3% |
| Models: Code | 85 | 1146 | 47.2% |
| Models: 3D | 108 | 1008 | 35.3% |
Source: Artificial Analysis indexes and Design Arena results as published in OpenRouter’s model data, fetched Oct 15, 2026. Higher is better. Not measured by TokenCenter. See all rankings.