Key Takeaways
GPT-5.3 Codex wins:
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Has reasoning mode
MiMo v2 Omni wins:
- Cheaper input tokens
- Cheaper output tokens
Price Advantage
MiMo v2 Omni
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 | MiMo v2 Omni | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $1.75 | $0.40 | MiMo v2 Omni |
| Output (per 1M tokens) | $14.00 | $2.00 | MiMo v2 Omni |
| Cache Read (per 1M) | $0.17 | $0.08 | MiMo v2 Omni |
Using a 3:1 input/output ratio, MiMo v2 Omni is 83% cheaper overall.
GPT-5.3 Codex Providers
No provider data available
MiMo v2 Omni Providers
No provider data available
Benchmark Comparison
3
Benchmarks Compared
3
GPT-5.3 Codex Wins
0
MiMo v2 Omni Wins
Benchmark Scores
| Benchmark | GPT-5.3 Codex | MiMo v2 Omni | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 54.0 | 43.4 | |
Coding Index Code generation & understanding | 53.1 | 35.5 | |
GPQA Graduate-level science | 91.5 | 82.8 |
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
MiMo v2 Omni
262,144
tokens
GPT-5.3 Codex has a 34% larger context window.
Speed Performance
| Metric | GPT-5.3 Codex | MiMo v2 Omni | Winner |
|---|---|---|---|
| Tokens/second | 74.0 tok/s | 0.0 tok/s | |
| Time to First Token | 85.27s | 0.00s |
GPT-5.3 Codex responds Infinity% faster on average.
Capabilities
Feature Comparison
| Feature | GPT-5.3 Codex | MiMo v2 Omni |
|---|---|---|
| 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 | MiMo v2 Omni |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | OpenAI | Xiaomi |
| Released | Feb 2026 | Mar 2026 |
GPT-5.3 Codex Modalities
Input
textimage
Output
text
MiMo v2 Omni Modalities
Input
textaudioimagevideo
Output
text