Model Comparison

Gemini Diffusion vs GPT-5.1 High

GPT-5.1 High significantly outperforms across most benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Gemini Diffusion outperforms in 0 benchmarks, while GPT-5.1 High is better at 2 benchmarks (AIME 2025, GPQA).

GPT-5.1 High significantly outperforms across most benchmarks.

Tue Apr 21 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Cost data unavailable.

Lowest available price from all providers
Tue Apr 21 2026 • llm-stats.com
Google
Gemini Diffusion
Input tokens$0.00
Output tokens$0.00
Best providerUnknown Organization
OpenAI
GPT-5.1 High
Input tokens$1.25
Output tokens$10.00
Best providerOpenAI
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Context Window

Maximum input and output token capacity

Only GPT-5.1 High specifies input context (400,000 tokens). Only GPT-5.1 High specifies output context (128,000 tokens).

Google
Gemini Diffusion
Input- tokens
Output- tokens
OpenAI
GPT-5.1 High
Input400,000 tokens
Output128,000 tokens
Tue Apr 21 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-5.1 High supports multimodal inputs, whereas Gemini Diffusion does not.

GPT-5.1 High can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini Diffusion

Text
Images
Audio
Video

GPT-5.1 High

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-5.1 High

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini Diffusion was released on 2025-05-20, while GPT-5.1 High was released on 2025-11-12.

GPT-5.1 High is 6 months newer than Gemini Diffusion.

Gemini Diffusion

May 20, 2025

11 months ago

GPT-5.1 High

Nov 12, 2025

5 months ago

5mo 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

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Key Takeaways

Google
OpenAI
Larger context window (400,000 tokens)
Supports multimodal inputs
Higher AIME 2025 score (99.6% vs 23.3%)
Higher GPQA score (88.1% vs 40.4%)

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini Diffusion
OpenAI
GPT-5.1 High

FAQ

Common questions about Gemini Diffusion vs GPT-5.1 High

GPT-5.1 High significantly outperforms across most benchmarks. Gemini Diffusion is made by Google and GPT-5.1 High is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Gemini Diffusion scores HumanEval: 89.6%, MBPP: 76.0%, Global-MMLU-Lite: 69.1%, LBPP (v2): 56.8%, BigCodeBench: 45.4%. GPT-5.1 High scores AIME 2025: 99.6%, GPQA: 88.1%.
Gemini Diffusion supports an unknown number of tokens and GPT-5.1 High supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include multimodal support (no vs yes). See the full comparison above for benchmark-by-benchmark results.
Gemini Diffusion is developed by Google and GPT-5.1 High is developed by OpenAI.