Model Comparison

Gemini Diffusion vs GPT-4.5

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

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Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Gemini Diffusion outperforms in 1 benchmarks (HumanEval), while GPT-4.5 is better at 2 benchmarks (GPQA, SWE-Bench Verified).

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

Tue May 12 2026 • llm-stats.com

Arena Performance

Human preference votes

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).

Google
Gemini Diffusion
Input- tokens
Output- tokens
OpenAI
GPT-4.5
Input128,000 tokens
Output4,096 tokens
Tue May 12 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-4.5 supports multimodal inputs, whereas Gemini Diffusion does not.

GPT-4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini Diffusion

Text
Images
Audio
Video

GPT-4.5

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Gemini Diffusion

Proprietary

Closed source

GPT-4.5

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini Diffusion was released on 2025-05-20, while GPT-4.5 was released on 2025-02-27.

Gemini Diffusion is 3 months newer than GPT-4.5.

Gemini Diffusion

May 20, 2025

11 months ago

2mo newer
GPT-4.5

Feb 27, 2025

1.2 years ago

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→

Key Takeaways

Google
Higher HumanEval score (89.6% vs 88.0%)
OpenAI
Larger context window (128,000 tokens)
Supports multimodal inputs
Higher GPQA score (69.5% vs 40.4%)
Higher SWE-Bench Verified score (38.0% vs 22.9%)

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini Diffusion
OpenAI
GPT-4.5

FAQ

Common questions about Gemini Diffusion vs GPT-4.5.

Which is better, Gemini Diffusion or GPT-4.5?

GPT-4.5 shows notably better performance in the majority of benchmarks. Gemini Diffusion is made by Google and GPT-4.5 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini Diffusion compare to GPT-4.5 in benchmarks?

Gemini Diffusion scores HumanEval: 89.6%, MBPP: 76.0%, Global-MMLU-Lite: 69.1%, LBPP (v2): 56.8%, BigCodeBench: 45.4%. GPT-4.5 scores GSM8k: 97.0%, MMLU: 90.8%, CharXiv-D: 90.0%, IFEval: 88.2%, HumanEval: 88.0%.

What are the context window sizes for Gemini Diffusion and GPT-4.5?

Gemini Diffusion supports an unknown number of tokens and GPT-4.5 supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini Diffusion and GPT-4.5?

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

Who makes Gemini Diffusion and GPT-4.5?

Gemini Diffusion is developed by Google and GPT-4.5 is developed by OpenAI.