Model Comparison

GPT-5.1 Codex vs Magistral MediumWhich is better in 2026?

Comparing GPT-5.1 Codex and Magistral Medium across benchmarks, pricing, and capabilities.

Verdict: GPT-5.1 Codex vs Magistral Medium — which is better?

GPT-5.1 Codex (by OpenAI) and Magistral Medium (by Mistral AI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Choose GPT-5.1 Codex if…

  • you want the most recent training data — it shipped Nov 2025

Choose Magistral Medium if…

  • you need open weights you can self-host or fine-tune
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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

GPT-5.1 Codex and Magistral Mediumdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-5.1 Codex specifies input context (400,000 tokens). Only GPT-5.1 Codex specifies output context (128,000 tokens).

OpenAI
GPT-5.1 Codex
Input400,000 tokens
Output128,000 tokens
Mistral AI
Magistral Medium
Input- tokens
Output- tokens
Tue Jun 23 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.1 Codex and Magistral Medium support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

GPT-5.1 Codex

Text
Images
Audio
Video

Magistral Medium

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-5.1 Codex is licensed under a proprietary license, while Magistral Medium uses Apache 2.0.

License differences may affect how you can use these models in commercial or open-source projects.

GPT-5.1 Codex

Proprietary

Closed source

Magistral Medium

Apache 2.0

Open weights

Release Timeline

When each model was launched

GPT-5.1 Codex was released on 2025-11-19, while Magistral Medium was released on 2025-06-10.

GPT-5.1 Codex is 5 months newer than Magistral Medium.

GPT-5.1 Codex

Nov 19, 2025

7 months ago

5mo newer
Magistral Medium

Jun 10, 2025

1.0 years ago

Knowledge Cutoff

When training data ends

GPT-5.1 Codex has a knowledge cutoff of 2024-09-30, while Magistral Medium has a cutoff of 2025-06-01.

Magistral Medium has more recent training data (up to 2025-06-01), making it potentially better informed about events through that date compared to GPT-5.1 Codex (2024-09-30).

GPT-5.1 Codex

Sep 2024

Magistral Medium

Jun 2025

9 mo newer

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (400,000 tokens)
Mistral AI
Has open weights

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5.1 Codex
Mistral AI
Magistral Medium

FAQ

Common questions about GPT-5.1 Codex vs Magistral Medium.

Which is better, GPT-5.1 Codex or Magistral Medium?

GPT-5.1 Codex (OpenAI) and Magistral Medium (Mistral AI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does GPT-5.1 Codex compare to Magistral Medium in benchmarks?

GPT-5.1 Codex scores SWE-Bench Verified: 73.7%, SWE-Lancer: 66.3%, Terminal-Bench 2.0: 52.8%. Magistral Medium scores AIME 2024: 73.6%, GPQA: 70.8%, AIME 2025: 64.9%, LiveCodeBench: 50.3%, Aider-Polyglot: 47.1%.

What are the context window sizes for GPT-5.1 Codex and Magistral Medium?

GPT-5.1 Codex supports 400K tokens and Magistral Medium supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-5.1 Codex and Magistral Medium?

Key differences include licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5.1 Codex and Magistral Medium?

GPT-5.1 Codex is developed by OpenAI and Magistral Medium is developed by Mistral AI.

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