Model Comparison

GPT OSS 120B vs Magistral Small 2506Which is better in 2026?

GPT OSS 120B significantly outperforms across most benchmarks.

Verdict: GPT OSS 120B vs Magistral Small 2506 — which is better?

GPT OSS 120B (by OpenAI) and Magistral Small 2506 (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 120B outperforms in 1 benchmarks (GPQA), while Magistral Small 2506 is better at 0 benchmarks. GPT OSS 120B significantly outperforms across most benchmarks.

Choose GPT OSS 120B if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Aug 2025

Choose Magistral Small 2506 if…

  • you are already invested in the Mistral AI ecosystem

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GPT OSS 120B outperforms in 1 benchmarks (GPQA), while Magistral Small 2506 is better at 0 benchmarks.

GPT OSS 120B significantly outperforms across most benchmarks.

Sat Jul 18 2026 • llm-stats.com

Arena Performance

Human preference votes

Model Size

Parameter count comparison

92.8B diff

GPT OSS 120B has 92.8B more parameters than Magistral Small 2506, making it 386.7% larger.

OpenAI
GPT OSS 120B
116.8Bparameters
Mistral AI
Magistral Small 2506
24.0Bparameters
116.8B
GPT OSS 120B
24.0B
Magistral Small 2506

Context Window

Maximum input and output token capacity

Only GPT OSS 120B specifies input context (131,072 tokens). Only GPT OSS 120B specifies output context (131,072 tokens).

OpenAI
GPT OSS 120B
Input131,072 tokens
Output131,072 tokens
Mistral AI
Magistral Small 2506
Input- tokens
Output- tokens
Sat Jul 18 2026 • llm-stats.com

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 120B

Apache 2.0

Open weights

Magistral Small 2506

Apache 2.0

Open weights

Release Timeline

When each model was launched

GPT OSS 120B was released on 2025-08-05, while Magistral Small 2506 was released on 2025-06-10.

GPT OSS 120B is 2 months newer than Magistral Small 2506.

GPT OSS 120B

Aug 5, 2025

11 months ago

1mo newer
Magistral Small 2506

Jun 10, 2025

1.1 years ago

Knowledge Cutoff

When training data ends

Magistral Small 2506 has a documented knowledge cutoff of 2025-06-01, while GPT OSS 120B's cutoff date is not specified.

We can confirm Magistral Small 2506's training data extends to 2025-06-01, but cannot make a direct comparison without GPT OSS 120B's cutoff date.

GPT OSS 120B

—

Magistral Small 2506

Jun 2025

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Larger context window (131,072 tokens)
Higher GPQA score (80.1% vs 68.2%)
Mistral AI

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

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT OSS 120B and Magistral Small 2506 side-by-side, then vote on the output you prefer.

GPT OSS 120B
✓ Preferred
Magistral Small 2506
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT OSS 120B
Mistral AI
Magistral Small 2506

FAQ

Common questions about GPT OSS 120B vs Magistral Small 2506.

Which is better, GPT OSS 120B or Magistral Small 2506?

GPT OSS 120B significantly outperforms across most benchmarks. GPT OSS 120B is made by OpenAI and Magistral Small 2506 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 120B compare to Magistral Small 2506 in benchmarks?

GPT OSS 120B scores MMLU: 90.0%, CodeForces: 82.1%, GPQA: 80.1%, TAU-bench Retail: 67.8%, HealthBench: 57.6%. Magistral Small 2506 scores AIME 2024: 70.7%, GPQA: 68.2%, AIME 2025: 62.8%, LiveCodeBench: 51.3%.

What are the context window sizes for GPT OSS 120B and Magistral Small 2506?

GPT OSS 120B supports 131K tokens and Magistral Small 2506 supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes GPT OSS 120B and Magistral Small 2506?

GPT OSS 120B is developed by OpenAI and Magistral Small 2506 is developed by Mistral AI.

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