Model Comparison
GPT-5.3 CodexOpenAI o4-mini
Let's see who can write code better - GPT-5.3 Codex or OpenAI o4-mini
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
OpenAI o4-mini
Description
Future iteration of reasoning models
Specifications
Context Window200K
Max Output66K
ReleasedJun 2025
API✓
Pricing (per 1M)
In / Out
$1.1/ $4.4
Key Features
Advanced reasoningFuture capabilitiesEfficient processing
Strengths
- ✓Next-gen reasoning
- ✓Improved efficiency
- ✓Better performance
Weaknesses
- ✗Not yet released
- ✗Purely speculative