GPT-5.3 Codexon Krater.ai
The newest and most advanced coding model from OpenAI. GPT-5.3 Codex pushes the frontier of AI-assisted software development with unmatched code understanding.
Released February 24, 2026
Specifications
GPT-5.3 Codex at a glance
Context
400K tokens
Max output
128K tokens
Input
Text, Image, File
Output
Text
Input price
$1.75 / 1M
Output price
$14.00 / 1M
Is ChatGPT down?
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Live ChatGPT statusCapabilities
What it is good at
Catalog capabilities
- Accepts image input
- Generates text responses
- Supports tool calling
- Supports structured outputs
- Cutting-edge code generation
- Deep architectural understanding
Good for
Benchmarks
Catalog data, not Krater benchmarks.
Intelligence index score
32.5
Design Arena godotgamedev rank
#27
Design Arena androidnative rank
#30
Compare
Compare GPT-5.3 Codex
GPT-5.3 Codex vs GPT-5.2 Codex
GPT-5.2-Codex is an upgraded version of GPT-5.1-Codex optimized for software engineering and coding workflows.
Open comparisonGPT-5.3 Codex vs GPT-4.1
GPT-4.1 is a flagship large language model optimized for advanced instruction following, real-world software engineering, and long-context reasoning.
Open comparisonGPT-5.3 Codex vs GPT-5.2 Pro
GPT-5.2 Pro is OpenAI’s most advanced model, offering major improvements in agentic coding and long context performance over GPT-5 Pro.
Open comparisonFAQ
Questions about GPT-5.3 Codex
Clear answers based on the model catalog and Krater access.