Model Comparison

Claude Sonnet 4.5 vs Gemini DiffusionWhich is better in 2026?

Claude Sonnet 4.5 significantly outperforms across most benchmarks.

Verdict: Claude Sonnet 4.5 vs Gemini Diffusion — which is better?

Claude Sonnet 4.5 (by Anthropic) and Gemini Diffusion (by Google) 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.

Claude Sonnet 4.5 outperforms in 2 benchmarks (AIME 2025, GPQA), while Gemini Diffusion is better at 0 benchmarks. Claude Sonnet 4.5 significantly outperforms across most benchmarks.

Choose Claude Sonnet 4.5 if…

  • you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
  • you want the most recent training data — it shipped Sep 2025

Choose Gemini Diffusion if…

  • you are already invested in the Google ecosystem
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Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Claude Sonnet 4.5 outperforms in 2 benchmarks (AIME 2025, GPQA), while Gemini Diffusion is better at 0 benchmarks.

Claude Sonnet 4.5 significantly outperforms across most benchmarks.

Sat Jun 13 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Claude Sonnet 4.5 specifies input context (200,000 tokens). Only Claude Sonnet 4.5 specifies output context (64,000 tokens).

Anthropic
Claude Sonnet 4.5
Input200,000 tokens
Output64,000 tokens
Google
Gemini Diffusion
Input- tokens
Output- tokens
Sat Jun 13 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude Sonnet 4.5 supports multimodal inputs, whereas Gemini Diffusion does not.

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

Claude Sonnet 4.5

Text
Images
Audio
Video

Gemini Diffusion

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.

Claude Sonnet 4.5

Proprietary

Closed source

Gemini Diffusion

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 4.5 was released on 2025-09-29, while Gemini Diffusion was released on 2025-05-20.

Claude Sonnet 4.5 is 4 months newer than Gemini Diffusion.

Claude Sonnet 4.5

Sep 29, 2025

8 months ago

4mo newer
Gemini Diffusion

May 20, 2025

1.1 years ago

Knowledge Cutoff

When training data ends

Claude Sonnet 4.5 has a documented knowledge cutoff of 2025-01-31, while Gemini Diffusion's cutoff date is not specified.

We can confirm Claude Sonnet 4.5's training data extends to 2025-01-31, but cannot make a direct comparison without Gemini Diffusion's cutoff date.

Claude Sonnet 4.5

Jan 2025

Gemini Diffusion

—

Outputs Comparison

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Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Supports multimodal inputs
Higher AIME 2025 score (87.0% vs 23.3%)
Higher GPQA score (83.4% vs 40.4%)
Google

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

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Sonnet 4.5
Google
Gemini Diffusion

FAQ

Common questions about Claude Sonnet 4.5 vs Gemini Diffusion.

Which is better, Claude Sonnet 4.5 or Gemini Diffusion?

Claude Sonnet 4.5 significantly outperforms across most benchmarks. Claude Sonnet 4.5 is made by Anthropic and Gemini Diffusion is made by Google. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Sonnet 4.5 compare to Gemini Diffusion in benchmarks?

Claude Sonnet 4.5 scores MMMLU: 89.1%, AIME 2025: 87.0%, TAU-bench Retail: 86.2%, GPQA: 83.4%, MMMUval: 77.8%. Gemini Diffusion scores HumanEval: 89.6%, MBPP: 76.0%, Global-MMLU-Lite: 69.1%, LBPP (v2): 56.8%, BigCodeBench: 45.4%.

What are the context window sizes for Claude Sonnet 4.5 and Gemini Diffusion?

Claude Sonnet 4.5 supports 200K tokens and Gemini Diffusion 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 Claude Sonnet 4.5 and Gemini Diffusion?

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

Who makes Claude Sonnet 4.5 and Gemini Diffusion?

Claude Sonnet 4.5 is developed by Anthropic and Gemini Diffusion is developed by Google.

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