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GPT-4.5 vs Mistral Large 3 (675B Instruct 2512 Eagle)

GPT-4.5 shows notably better performance in the majority of benchmarks.

OpenAI · Mistral AI · Updated for 2026

Which is better?

GPT-4.5 outperforms in 2 benchmarks (GPQA, SimpleQA), while Mistral Large 3 (675B Instruct 2512 Eagle) is better at 1 benchmark (MMMLU). GPT-4.5 shows notably better performance in the majority of benchmarks.

Based on current benchmark, pricing, and model metadata for 2026.

Choose GPT-4.5

  • you want the strongest raw capability — it leads on 2 of 3 shared benchmarks

Choose Mistral Large 3 (675B Instruct 2512 Eagle)

  • you want the most recent training data — it shipped Dec 2025
  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

GPT-4.5
OpenAI
Mistral Large 3 (675B Instruct 2512 Eagle)
Mistral AI
Benchmark wins
2 of 3
1 of 3
Input price
$75.00 / M
— / M
Output price
$150.00 / M
— / M
Context window
128,000
—
Released
Feb 2025
Dec 2025
License
Proprietary
Apache 2.0

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

GPT-4.5 outperforms in 2 benchmarks (GPQA, SimpleQA), while Mistral Large 3 (675B Instruct 2512 Eagle) is better at 1 benchmark (MMMLU).

GPT-4.5 shows notably better performance in the majority of benchmarks.

Mon Aug 24 2026 • llm-stats.com

Arena Performance

Playground indexes and blind preference scores

Context Window

Maximum input and output token capacity

Only GPT-4.5 specifies input context (128,000 tokens). Only GPT-4.5 specifies output context (4,096 tokens).

OpenAI
GPT-4.5
Input128,000 tokens
Output4,096 tokens
Mistral AI
Mistral Large 3 (675B Instruct 2512 Eagle)
Input- tokens
Output- tokens
Mon Aug 24 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-4.5 and Mistral Large 3 (675B Instruct 2512 Eagle) support multimodal inputs.

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

GPT-4.5

Text
Images
Audio
Video

Mistral Large 3 (675B Instruct 2512 Eagle)

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-4.5 is licensed under a proprietary license, while Mistral Large 3 (675B Instruct 2512 Eagle) uses Apache 2.0.

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

GPT-4.5

Proprietary

Closed source

Mistral Large 3 (675B Instruct 2512 Eagle)

Apache 2.0

Open weights

Release Timeline

When each model was launched

GPT-4.5 was released on 2025-02-27, while Mistral Large 3 (675B Instruct 2512 Eagle) was released on 2025-12-04.

Mistral Large 3 (675B Instruct 2512 Eagle) is 9 months newer than GPT-4.5.

GPT-4.5

Feb 27, 2025

1.5 years ago

Mistral Large 3 (675B Instruct 2512 Eagle)

Dec 4, 2025

8 months ago

9mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GPT-4.5 and Mistral Large 3 (675B Instruct 2512 Eagle) side-by-side, then vote on the output you prefer.

GPT-4.5
✓ Preferred
Mistral Large 3 (675B Instruct 2512 Eagle)
Open in Playground

FAQ

Common questions about GPT-4.5 vs Mistral Large 3 (675B Instruct 2512 Eagle).

Which is better, GPT-4.5 or Mistral Large 3 (675B Instruct 2512 Eagle)?

GPT-4.5 shows notably better performance in the majority of benchmarks. GPT-4.5 is made by OpenAI and Mistral Large 3 (675B Instruct 2512 Eagle) is made by Mistral AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-4.5 compare to Mistral Large 3 (675B Instruct 2512 Eagle) in benchmarks?

GPT-4.5 scores GSM8k: 97.0%, MMLU: 90.8%, CharXiv-D: 90.0%, IFEval: 88.2%, HumanEval: 88.0%. Mistral Large 3 (675B Instruct 2512 Eagle) 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 GPT-4.5 and Mistral Large 3 (675B Instruct 2512 Eagle)?

GPT-4.5 supports 128K tokens and Mistral Large 3 (675B Instruct 2512 Eagle) 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-4.5 and Mistral Large 3 (675B Instruct 2512 Eagle)?

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

Who makes GPT-4.5 and Mistral Large 3 (675B Instruct 2512 Eagle)?

GPT-4.5 is developed by OpenAI and Mistral Large 3 (675B Instruct 2512 Eagle) is developed by Mistral AI.

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