Model Comparison
GPT-5.3 CodexClaude Opus 4.6
Let's see who can write code better - GPT-5.3 Codex or Claude Opus 4.6
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
Claude Opus 4.6
Description
Latest flagship Claude model with breakthrough coding and agentic capabilities
Specifications
Context Window200K
Max Output16K
ReleasedFeb 2026
API✓
Pricing (per 1M)
In / Out
$5/ $25
Key Features
Breakthrough reasoningAdvanced agentic codingComplex problem solvingMulti-language supportVision capabilities
Strengths
- ✓State-of-the-art coding performance
- ✓Superior agentic task handling
- ✓Excellent at long-horizon tasks
- ✓Most capable Claude model to date
Weaknesses
- ✗Premium pricing
- ✗Slower response times
- ✗Overkill for simple tasks
Agent Support
No known agents