Model Comparison

GPT-5 Codex vs Mistral Small 3 24B BaseWhich is better in 2026?

Comparing GPT-5 Codex and Mistral Small 3 24B Base across benchmarks, pricing, and capabilities.

Verdict: GPT-5 Codex vs Mistral Small 3 24B Base — which is better?

GPT-5 Codex (by OpenAI) and Mistral Small 3 24B Base (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 Codex if…

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

Choose Mistral Small 3 24B Base if…

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

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

GPT-5 Codex and Mistral Small 3 24B Basedon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Input Capabilities

Supported data types and modalities

Mistral Small 3 24B Base supports multimodal inputs, whereas GPT-5 Codex does not.

Mistral Small 3 24B Base can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-5 Codex

Text
Images
Audio
Video

Mistral Small 3 24B Base

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-5 Codex is licensed under a proprietary license, while Mistral Small 3 24B Base uses Apache 2.0.

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

GPT-5 Codex

Proprietary

Closed source

Mistral Small 3 24B Base

Apache 2.0

Open weights

Release Timeline

When each model was launched

GPT-5 Codex was released on 2025-09-15, while Mistral Small 3 24B Base was released on 2025-01-30.

GPT-5 Codex is 8 months newer than Mistral Small 3 24B Base.

GPT-5 Codex

Sep 15, 2025

10 months ago

7mo newer
Mistral Small 3 24B Base

Jan 30, 2025

1.5 years ago

Knowledge Cutoff

When training data ends

GPT-5 Codex has a knowledge cutoff of 2024-09-30, while Mistral Small 3 24B Base has a cutoff of 2023-10-01.

GPT-5 Codex has more recent training data (up to 2024-09-30), making it potentially better informed about events through that date compared to Mistral Small 3 24B Base (2023-10-01).

GPT-5 Codex

Sep 2024

11 mo newer
Mistral Small 3 24B Base

Oct 2023

Outputs Comparison

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Key Takeaways

OpenAI

No standout differentiators in the data we have for this pair.

Mistral AI
Supports multimodal inputs
Has open weights

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-5 Codex and Mistral Small 3 24B Base side-by-side, then vote on the output you prefer.

GPT-5 Codex
✓ Preferred
Mistral Small 3 24B Base
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-5 Codex
Mistral AI
Mistral Small 3 24B Base

FAQ

Common questions about GPT-5 Codex vs Mistral Small 3 24B Base.

Which is better, GPT-5 Codex or Mistral Small 3 24B Base?

GPT-5 Codex (OpenAI) and Mistral Small 3 24B Base (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 Codex compare to Mistral Small 3 24B Base in benchmarks?

GPT-5 Codex scores SWE-Bench Verified: 74.5%. Mistral Small 3 24B Base scores ARC-C: 91.3%, GSM8k: 80.7%, MMLU: 80.7%, TriviaQA: 80.3%, MBPP: 69.6%.

What are the main differences between GPT-5 Codex and Mistral Small 3 24B Base?

Key differences include multimodal support (no vs yes), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5 Codex and Mistral Small 3 24B Base?

GPT-5 Codex is developed by OpenAI and Mistral Small 3 24B Base is developed by Mistral AI.

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