Model Comparison

GPT OSS 20B vs Mistral Small 3.2 24B InstructWhich is better in 2026?

GPT OSS 20B significantly outperforms across most benchmarks.

Verdict: GPT OSS 20B vs Mistral Small 3.2 24B Instruct — which is better?

GPT OSS 20B (by OpenAI) and Mistral Small 3.2 24B Instruct (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.

GPT OSS 20B outperforms in 2 benchmarks (GPQA, MMLU), while Mistral Small 3.2 24B Instruct is better at 0 benchmarks. GPT OSS 20B significantly outperforms across most benchmarks.

Choose GPT OSS 20B if…

  • you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
  • you want the most recent training data — it shipped Aug 2025

Choose Mistral Small 3.2 24B Instruct if…

  • you are already invested in the Mistral AI ecosystem
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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

GPT OSS 20B outperforms in 2 benchmarks (GPQA, MMLU), while Mistral Small 3.2 24B Instruct is better at 0 benchmarks.

GPT OSS 20B significantly outperforms across most benchmarks.

Mon Jun 15 2026 • llm-stats.com

Arena Performance

Human preference votes

Model Size

Parameter count comparison

2.7B diff

Mistral Small 3.2 24B Instruct has 2.7B more parameters than GPT OSS 20B, making it 12.9% larger.

OpenAI
GPT OSS 20B
20.9Bparameters
Mistral AI
Mistral Small 3.2 24B Instruct
23.6Bparameters
20.9B
GPT OSS 20B
23.6B
Mistral Small 3.2 24B Instruct

Context Window

Maximum input and output token capacity

Only GPT OSS 20B specifies input context (131,072 tokens). Only GPT OSS 20B specifies output context (32,768 tokens).

OpenAI
GPT OSS 20B
Input131,072 tokens
Output32,768 tokens
Mistral AI
Mistral Small 3.2 24B Instruct
Input- tokens
Output- tokens
Mon Jun 15 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Mistral Small 3.2 24B Instruct supports multimodal inputs, whereas GPT OSS 20B does not.

Mistral Small 3.2 24B Instruct can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT OSS 20B

Text
Images
Audio
Video

Mistral Small 3.2 24B Instruct

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under Apache 2.0.

Both models share the same licensing terms, providing consistent usage rights.

GPT OSS 20B

Apache 2.0

Open weights

Mistral Small 3.2 24B Instruct

Apache 2.0

Open weights

Release Timeline

When each model was launched

GPT OSS 20B was released on 2025-08-05, while Mistral Small 3.2 24B Instruct was released on 2025-06-20.

GPT OSS 20B is 2 months newer than Mistral Small 3.2 24B Instruct.

GPT OSS 20B

Aug 5, 2025

10 months ago

1mo newer
Mistral Small 3.2 24B Instruct

Jun 20, 2025

12 months ago

Knowledge Cutoff

When training data ends

Mistral Small 3.2 24B Instruct has a documented knowledge cutoff of 2023-10-01, while GPT OSS 20B's cutoff date is not specified.

We can confirm Mistral Small 3.2 24B Instruct's training data extends to 2023-10-01, but cannot make a direct comparison without GPT OSS 20B's cutoff date.

GPT OSS 20B

—

Mistral Small 3.2 24B Instruct

Oct 2023

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (131,072 tokens)
Higher GPQA score (71.5% vs 46.1%)
Higher MMLU score (85.3% vs 80.5%)
Mistral AI
Supports multimodal inputs

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT OSS 20B
Mistral AI
Mistral Small 3.2 24B Instruct

FAQ

Common questions about GPT OSS 20B vs Mistral Small 3.2 24B Instruct.

Which is better, GPT OSS 20B or Mistral Small 3.2 24B Instruct?

GPT OSS 20B significantly outperforms across most benchmarks. GPT OSS 20B is made by OpenAI and Mistral Small 3.2 24B Instruct is made by Mistral AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT OSS 20B compare to Mistral Small 3.2 24B Instruct in benchmarks?

GPT OSS 20B scores MMLU: 85.3%, CodeForces: 74.3%, GPQA: 71.5%, TAU-bench Retail: 54.8%, HealthBench: 42.5%. Mistral Small 3.2 24B Instruct scores DocVQA: 94.9%, AI2D: 92.9%, HumanEval Plus: 92.9%, ChartQA: 87.4%, IF: 84.8%.

What are the context window sizes for GPT OSS 20B and Mistral Small 3.2 24B Instruct?

GPT OSS 20B supports 131K tokens and Mistral Small 3.2 24B Instruct 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 OSS 20B and Mistral Small 3.2 24B Instruct?

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

Who makes GPT OSS 20B and Mistral Small 3.2 24B Instruct?

GPT OSS 20B is developed by OpenAI and Mistral Small 3.2 24B Instruct is developed by Mistral AI.

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