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
Krater rank
#53
Capabilities
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.
Design Arena godotgamedev rank
#24
Design Arena androidnative rank
#27
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-5.5 Pro
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads.
Open comparisonGPT-5.3 Codex vs GPT-5.5
GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks.
Open comparisonFAQ
Questions about GPT-5.3 Codex
Clear answers based on the model catalog and Krater access.
Use GPT-5.3 Codex in your API
Connect with Krater's unified API.