Key Takeaways
Claude 2 wins:
- No clear advantages in compared metrics
GPT-5.3 Codex wins:
- Cheaper input tokens
- Cheaper output tokens
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Supports vision
Price Advantage
GPT-5.3 Codex
Benchmark Advantage
GPT-5.3 Codex
Context Window
GPT-5.3 Codex
Speed
GPT-5.3 Codex
Pricing Comparison
Price Comparison
| Metric | Claude 2 | GPT-5.3 Codex | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $8.00 | $1.75 | GPT-5.3 Codex |
| Output (per 1M tokens) | $24.00 | $14.00 | GPT-5.3 Codex |
| Cache Read (per 1M) | N/A | $0.17 | GPT-5.3 Codex |
Using a 3:1 input/output ratio, GPT-5.3 Codex is 60% cheaper overall.
Claude 2 Providers
No provider data available
GPT-5.3 Codex Providers
No provider data available
Benchmark Comparison
6
Benchmarks Compared
0
Claude 2 Wins
3
GPT-5.3 Codex Wins
Benchmark Scores
| Benchmark | Claude 2 | GPT-5.3 Codex | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 9.1 | 54.0 | |
Coding Index Code generation & understanding | 12.9 | 53.1 | |
MMLU Pro Academic knowledge | 48.6 | - | - |
GPQA Graduate-level science | 34.4 | 91.5 | |
LiveCodeBench Competitive programming | 17.1 | - | - |
AIME Competition math | 0.0 | - | - |
GPT-5.3 Codex significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
Y-axis:
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Claude 2
Other models
Context & Performance
Context Window
Claude 2
N/A
tokens
GPT-5.3 Codex
400,000
tokens
Speed Performance
| Metric | Claude 2 | GPT-5.3 Codex | Winner |
|---|---|---|---|
| Tokens/second | 0.0 tok/s | 68.3 tok/s | |
| Time to First Token | 0.00s | 81.66s |
GPT-5.3 Codex responds Infinity% faster on average.
Capabilities
Feature Comparison
| Feature | Claude 2 | GPT-5.3 Codex |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Claude 2 | GPT-5.3 Codex |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | Anthropic | OpenAI |
| Released | Unknown | Feb 2026 |
Claude 2 Modalities
Input
Output
GPT-5.3 Codex Modalities
Input
textimage
Output
text