Key Takeaways
GPT-5.3 Codex wins:
- Larger context window
- Higher intelligence benchmark
- Better at coding
- Supports vision
Mistral Small wins:
- Cheaper input tokens
- Cheaper output tokens
- Faster response time
Price Advantage
Mistral Small
Benchmark Advantage
GPT-5.3 Codex
Context Window
GPT-5.3 Codex
Speed
Mistral Small
Pricing Comparison
Price Comparison
| Metric | GPT-5.3 Codex | Mistral Small | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $1.75 | $0.10 | Mistral Small |
| Output (per 1M tokens) | $14.00 | $0.30 | Mistral Small |
| Cache Read (per 1M) | $0.17 | N/A | GPT-5.3 Codex |
Using a 3:1 input/output ratio, Mistral Small is 97% cheaper overall.
GPT-5.3 Codex Providers
No provider data available
Mistral Small Providers
No provider data available
Benchmark Comparison
6
Benchmarks Compared
2
GPT-5.3 Codex Wins
0
Mistral Small Wins
Benchmark Scores
| Benchmark | GPT-5.3 Codex | Mistral Small | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 54.0 | 10.2 | |
Coding Index Code generation & understanding | 53.1 | - | - |
MMLU Pro Academic knowledge | - | 52.9 | - |
GPQA Graduate-level science | 91.5 | 38.1 | |
LiveCodeBench Competitive programming | - | 14.1 | - |
AIME Competition math | - | 6.3 | - |
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 Small
N/A
tokens
Speed Performance
| Metric | GPT-5.3 Codex | Mistral Small | Winner |
|---|---|---|---|
| Tokens/second | 68.3 tok/s | 168.8 tok/s | |
| Time to First Token | 81.66s | 0.30s |
Mistral Small responds 147% faster on average.
Capabilities
Feature Comparison
| Feature | GPT-5.3 Codex | Mistral Small |
|---|---|---|
| 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 |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | OpenAI | Mistral AI |
| Released | Feb 2026 | Unknown |
GPT-5.3 Codex Modalities
Input
textimage
Output
text
Mistral Small Modalities
Input
Output