Key Takeaways
GPT-5.3 Codex wins:
- Larger context window
- Faster response time
- Higher intelligence benchmark
- Better at coding
- Supports vision
- Has reasoning mode
- Supports tool calls
Mistral Small 2603 wins:
- Cheaper input tokens
- Cheaper output tokens
Price Advantage
Mistral Small 2603
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 Small 2603 | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $1.75 | $0.15 | Mistral Small 2603 |
| Output (per 1M tokens) | $14.00 | $0.60 | Mistral Small 2603 |
| Cache Read (per 1M) | $0.17 | $0.01 | Mistral Small 2603 |
Using a 3:1 input/output ratio, Mistral Small 2603 is 95% cheaper overall.
GPT-5.3 Codex Providers
No provider data available
Mistral Small 2603 Providers
No provider data available
Benchmark Comparison
3
Benchmarks Compared
0
GPT-5.3 Codex Wins
0
Mistral Small 2603 Wins
Benchmark Scores
| Benchmark | GPT-5.3 Codex | Mistral Small 2603 | 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:
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Other models
Context & Performance
Context Window
GPT-5.3 Codex
400,000
tokens
Mistral Small 2603
N/A
tokens
Speed Performance
| Metric | GPT-5.3 Codex | Mistral Small 2603 | 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 | Mistral Small 2603 |
|---|---|---|
| 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 Small 2603 |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | OpenAI | Mistral AI |
| Released | Feb 2026 | Unknown |
GPT-5.3 Codex Modalities
Input
textimage
Output
text
Mistral Small 2603 Modalities
Input
Output