Model Comparison

Grok 4.5 vs Mistral Large 3 (675B Base)Which is better in 2026?

Grok 4.5 significantly outperforms across most benchmarks.

Verdict: Grok 4.5 vs Mistral Large 3 (675B Base) — which is better?

Grok 4.5 (by xAI) and Mistral Large 3 (675B 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.

Grok 4.5 outperforms in 1 benchmarks (GPQA), while Mistral Large 3 (675B Base) is better at 0 benchmarks. Grok 4.5 significantly outperforms across most benchmarks.

Choose Grok 4.5 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Jul 2026

Choose Mistral Large 3 (675B Base) if…

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

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Grok 4.5 outperforms in 1 benchmarks (GPQA), while Mistral Large 3 (675B Base) is better at 0 benchmarks.

Grok 4.5 significantly outperforms across most benchmarks.

Mon Jul 27 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Grok 4.5 specifies input context (500,000 tokens).

xAI
Grok 4.5
Input500,000 tokens
Output- tokens
Mistral AI
Mistral Large 3 (675B Base)
Input- tokens
Output- tokens
Mon Jul 27 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Grok 4.5 and Mistral Large 3 (675B Base) support multimodal inputs.

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

Grok 4.5

Text
Images
Audio
Video

Mistral Large 3 (675B Base)

Text
Images
Audio
Video

License

Usage and distribution terms

Grok 4.5 is licensed under a proprietary license, while Mistral Large 3 (675B Base) uses Apache 2.0.

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

Grok 4.5

Proprietary

Closed source

Mistral Large 3 (675B Base)

Apache 2.0

Open weights

Release Timeline

When each model was launched

Grok 4.5 was released on 2026-07-16, while Mistral Large 3 (675B Base) was released on 2025-12-04.

Grok 4.5 is 7 months newer than Mistral Large 3 (675B Base).

Grok 4.5

Jul 16, 2026

1 weeks ago

7mo newer
Mistral Large 3 (675B Base)

Dec 4, 2025

7 months ago

Knowledge Cutoff

When training data ends

Grok 4.5 has a documented knowledge cutoff of 2026-02-01, while Mistral Large 3 (675B Base)'s cutoff date is not specified.

We can confirm Grok 4.5's training data extends to 2026-02-01, but cannot make a direct comparison without Mistral Large 3 (675B Base)'s cutoff date.

Grok 4.5

Feb 2026

Mistral Large 3 (675B Base)

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Outputs Comparison

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Key Takeaways

xAI
Larger context window (500,000 tokens)
Higher GPQA score (93.0% vs 43.9%)
Mistral AI
Has open weights

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Grok 4.5 and Mistral Large 3 (675B Base) side-by-side, then vote on the output you prefer.

Grok 4.5
✓ Preferred
Mistral Large 3 (675B Base)
Open in Playground
AI Model Comparison Table
Feature
xAI
Grok 4.5
Mistral AI
Mistral Large 3 (675B Base)

FAQ

Common questions about Grok 4.5 vs Mistral Large 3 (675B Base).

Which is better, Grok 4.5 or Mistral Large 3 (675B Base)?

Grok 4.5 significantly outperforms across most benchmarks. Grok 4.5 is made by xAI and Mistral Large 3 (675B Base) is made by Mistral AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Grok 4.5 compare to Mistral Large 3 (675B Base) in benchmarks?

Grok 4.5 scores GPQA: 93.0%, Terminal-Bench 2.1: 83.3%, Artificial Analysis Coding Agent Index v1.1: 76.0%, SWE-Bench Pro: 64.7%, AA-Omniscience Index: 63.0%. Mistral Large 3 (675B Base) scores MMMLU: 85.5%, AMC_2022_23: 52.0%, GPQA: 43.9%, LiveCodeBench: 34.4%, SimpleQA: 23.8%.

What are the context window sizes for Grok 4.5 and Mistral Large 3 (675B Base)?

Grok 4.5 supports 500K tokens and Mistral Large 3 (675B Base) 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 Grok 4.5 and Mistral Large 3 (675B Base)?

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

Who makes Grok 4.5 and Mistral Large 3 (675B Base)?

Grok 4.5 is developed by xAI and Mistral Large 3 (675B Base) is developed by Mistral AI.

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