Model Comparison
GPT-5.3 CodexGrok 4
Let's see who can write code better - GPT-5.3 Codex or Grok 4
Model Information
GPT-5.3 Codex
Description
Next-generation coding-optimized model from OpenAI with enhanced autonomous development capabilities
Specifications
Context Window272K
Max Output33K
ReleasedFeb 2026
API✓
Pricing (per 1M)
In / Out
$1.5/ $12
Key Features
Advanced autonomous codingEnhanced code reviewMulti-step reasoningFull-stack development
Strengths
- ✓State-of-the-art coding benchmarks
- ✓Superior autonomous task completion
- ✓Excellent code review capabilities
- ✓Large context window
Weaknesses
- ✗Premium pricing
- ✗Optimized for coding over general tasks
Agent Support
No known agents
Grok 4
Description
Advanced flagship model from xAI with superior reasoning
Specifications
Context Window256K
Max Output16K
ReleasedJul 2024
API✓
Pricing (per 1M)
In / Out
$3/ $15
Key Features
Advanced reasoningLarge context windowSuperior performance
Strengths
- ✓Excellent reasoning abilities
- ✓Very large context
- ✓High-quality outputs
Weaknesses
- ✗Higher cost
- ✗Slower inference
Agent Support
No known agents