Key Takeaways
GPT-5.3 Codex wins:
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Supports vision
- Has reasoning mode
Mistral Nemo wins:
- Cheaper input tokens
- Cheaper output tokens
Price Advantage
Mistral Nemo
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 | Mistral Nemo | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $1.75 | $0.02 | Mistral Nemo |
| Output (per 1M tokens) | $14.00 | $0.04 | Mistral Nemo |
| Cache Read (per 1M) | $0.17 | $0.01 | Mistral Nemo |
Using a 3:1 input/output ratio, Mistral Nemo is 99% cheaper overall.
GPT-5.3 Codex Providers
No provider data available
Mistral Nemo Providers
No provider data available
Benchmark Comparison
5
Benchmarks Compared
2
GPT-5.3 Codex Wins
0
Mistral Nemo Wins
Benchmark Scores
| Benchmark | GPT-5.3 Codex | Mistral Nemo | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 54.0 | 25.0 | |
Coding Index Code generation & understanding | 53.1 | - | - |
MMLU Pro Academic knowledge | - | 26.4 | - |
GPQA Graduate-level science | 91.5 | 8.7 | |
BBH Big-Bench Hard | - | 36.1 | - |
GPT-5.3 Codex significantly outperforms in coding benchmarks.
Cost vs Quality
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Other models
Context & Performance
Context Window
GPT-5.3 Codex
400,000
tokens
Mistral Nemo
131,072
tokens
GPT-5.3 Codex has a 67% larger context window.
Speed Performance
| Metric | GPT-5.3 Codex | Mistral Nemo | Winner |
|---|---|---|---|
| Tokens/second | 68.4 tok/s | N/A | |
| Time to First Token | 87.36s | N/A |
Capabilities
Feature Comparison
| Feature | GPT-5.3 Codex | Mistral Nemo |
|---|---|---|
| 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 | Mistral Nemo |
|---|---|---|
| License | Proprietary | Open Source |
| Author | OpenAI | Mistral AI |
| Released | Feb 2026 | Jul 2024 |
GPT-5.3 Codex Modalities
Input
textimage
Output
text
Mistral Nemo Modalities
Input
text
Output
text