Model Comparison
GPT-5.3 CodexGrok Code Fast 1
Let's see who can write code better - GPT-5.3 Codex or Grok Code Fast 1
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 Code Fast 1
Description
Fast code generation model from xAI
Specifications
Context Window128K
Max Output8K
ReleasedDec 2024
API✓
Pricing (per 1M)
In / Out
$0.2/ $1.5
Key Features
Fast code generationProgramming expertiseQuick responses
Strengths
- ✓Fast inference
- ✓Code-optimized
- ✓Cost-effective for coding
Weaknesses
- ✗Limited general knowledge
- ✗Focused on code only
Agent Support
No known agents