Key Takeaways
GPT-5.3 Codex wins:
- Cheaper input tokens
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Supports vision
- Has reasoning mode
- Supports tool calls
x-ai/grok-4.20-beta wins:
- Cheaper output tokens
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 | GPT-5.3 Codex | x-ai/grok-4.20-beta | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $1.75 | $2.00 | GPT-5.3 Codex |
| Output (per 1M tokens) | $14.00 | $6.00 | x-ai/grok-4.20-beta |
| Cache Read (per 1M) | $0.17 | $0.20 | GPT-5.3 Codex |
Using a 3:1 input/output ratio, x-ai/grok-4.20-beta is 38% cheaper overall.
GPT-5.3 Codex Providers
No provider data available
x-ai/grok-4.20-beta Providers
No provider data available
Benchmark Comparison
3
Benchmarks Compared
0
GPT-5.3 Codex Wins
0
x-ai/grok-4.20-beta Wins
Benchmark Scores
| Benchmark | GPT-5.3 Codex | x-ai/grok-4.20-beta | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 54.0 | - | - |
Coding Index Code generation & understanding | 53.1 | - | - |
GPQA Graduate-level science | 91.5 | - | - |
GPT-5.3 Codex significantly outperforms in coding benchmarks.
Cost vs Quality
X-axis:
Y-axis:
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Other models
Context & Performance
Context Window
GPT-5.3 Codex
400,000
tokens
x-ai/grok-4.20-beta
N/A
tokens
Speed Performance
| Metric | GPT-5.3 Codex | x-ai/grok-4.20-beta | Winner |
|---|---|---|---|
| Tokens/second | 74.0 tok/s | N/A | |
| Time to First Token | 85.27s | N/A |
Capabilities
Feature Comparison
| Feature | GPT-5.3 Codex | x-ai/grok-4.20-beta |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | GPT-5.3 Codex | x-ai/grok-4.20-beta |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | OpenAI | X Ai |
| Released | Feb 2026 | Unknown |
GPT-5.3 Codex Modalities
Input
textimage
Output
text
x-ai/grok-4.20-beta Modalities
Input
Output