Key Takeaways
o3 wins:
- Cheaper input tokens
- Cheaper output tokens
- Faster response time
- Has reasoning mode
Grok 4 wins:
- Larger context window
- Higher intelligence benchmark
- Better at coding
- Better at math
Price Advantage
o3
Benchmark Advantage
Grok 4
Context Window
Grok 4
Speed
o3
Pricing Comparison
Price Comparison
| Metric | o3 | Grok 4 | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $2.00 | $3.00 | o3 |
| Output (per 1M tokens) | $8.00 | $15.00 | o3 |
| Cache Read (per 1M) | $500000.00 | $750000.00 | o3 |
Using a 3:1 input/output ratio, o3 is 42% cheaper overall.
o3 Providers
OpenAI $2.00 (Cheapest)
Vercel $2.00 (Cheapest)
Grok 4 Providers
Vercel $3.00 (Cheapest)
xAI $3.00 (Cheapest)
Benchmark Comparison
8
Benchmarks Compared
1
o3 Wins
7
Grok 4 Wins
Benchmark Scores
| Benchmark | o3 | Grok 4 | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 38.3 | 41.4 | |
Coding Index Code generation & understanding | 38.4 | 40.5 | |
Math Index Mathematical reasoning | 88.3 | 92.7 | |
MMLU Pro Academic knowledge | 85.3 | 86.6 | |
GPQA Graduate-level science | 82.7 | 87.7 | |
LiveCodeBench Competitive programming | 80.8 | 81.9 | |
Aider Real-world code editing | 81.3 | 79.6 | |
AIME Competition math | 90.3 | 94.3 |
Grok 4 wins 7 out of 8 benchmarks.
Cost vs Quality
X-axis:
Y-axis:
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o3
Other models
Context & Performance
Context Window
o3
200,000
tokens
Max output: 100,000 tokens
Grok 4
256,000
tokens
Grok 4 has a 22% larger context window.
Speed Performance
| Metric | o3 | Grok 4 | Winner |
|---|---|---|---|
| Tokens/second | 109.7 tok/s | 38.5 tok/s | |
| Time to First Token | 20.34s | 15.96s |
o3 responds 185% faster on average.
Capabilities
Feature Comparison
| Feature | o3 | Grok 4 |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | o3 | Grok 4 |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | OpenAI | Xai |
| Released | Apr 2025 | Jul 2025 |
o3 Modalities
Input
imagetextfile
Output
text
Grok 4 Modalities
Input
imagetext
Output
text