Model Comparison
Claude Opus 4.5GPT-5.3 Codex
Let's see who can write code better - Claude Opus 4.5 or GPT-5.3 Codex
Model Information
Claude Opus 4.5
Description
Most advanced Claude model with enhanced capabilities
Specifications
Context Window200K
Max Output8K
ReleasedNov 2025
API✓
Pricing (per 1M)
In / Out
$5/ $25
Key Features
State-of-the-art reasoningAdvanced code generationComplex problem solvingMulti-language supportVision capabilities
Strengths
- ✓More affordable than 4.1
- ✓Superior reasoning abilities
- ✓Excellent at complex tasks
- ✓Most advanced Claude model
Weaknesses
- ✗Higher cost
- ✗Slower response times
- ✗Overkill for simple tasks
Agent Support
No known agents
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