Model Comparison
GPT-5 CodexOpenAI o3
Let's see who can write code better - GPT-5 Codex or OpenAI o3
Model Information
GPT-5 Codex
Description
Flagship model from OpenAI optimised for coding tasks
Specifications
Context Window272K
Max Output33K
ReleasedSep 2025
API✓
Pricing (per 1M)
In / Out
$1.25/ $10
Key Features
CodingAdvanced reasoningMulti-modal native
Strengths
- ✓State-of-the-art performance
- ✓Optimised for coding
- ✓Large context window
Weaknesses
- ✗Likely very expensive
- ✗Unknown specifications
Agent Support
No known agents
OpenAI o3
Description
Next generation reasoning model
Specifications
Context Window200K
Max Output100K
ReleasedMar 2025
API✓
Pricing (per 1M)
In / Out
$2/ $8
Key Features
Enhanced reasoningImproved capabilitiesBetter performance
Strengths
- ✓State-of-the-art reasoning
- ✓Improved over o1
- ✓Better efficiency
Weaknesses
- ✗Not yet released
- ✗Specifications unknown