GPT-5.3-Codex vs Mistral Medium 3
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for GPT-5.3-Codex and Mistral Medium 3.
GPT-5.3-Codex
GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...
Mistral Medium 3
Mistral Medium 3 is a high-performance enterprise-grade language model designed to deliver frontier-level capabilities at significantly reduced operational cost. It balances state-of-the-art reasoning and multimodal performance with 8× lower cost...
Technical Specifications
| Specification | GPT-5.3-Codex | Mistral Medium 3 |
|---|---|---|
| Provider | OpenAI | Mistral |
| Context Window | 400,000 tokens | 131,072 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | self hostable |
| Production Stability | stable | stable |
| API Available | Yes | Yes |
| Released Date | 2026-02-24 | 2025-05-07 |
API Pricing Comparison
Input Price per Million Tokens
GPT-5.3-Codex
$1.75
Mistral Medium 3
$0.40
Output Price per Million Tokens
GPT-5.3-Codex
$14.00
Mistral Medium 3
$2.00
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Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
GPT-5.3-Codex Quirks & Gotchas
No developer gotchas reported.
Mistral Medium 3 Quirks & Gotchas
No developer gotchas reported.