Model Comparison

Claude Sonnet 4.5 vs Gemini 2.0 Flash ThinkingWhich is better in 2026?

Claude Sonnet 4.5 significantly outperforms across most benchmarks.

Verdict: Claude Sonnet 4.5 vs Gemini 2.0 Flash Thinking — which is better?

Claude Sonnet 4.5 (by Anthropic) and Gemini 2.0 Flash Thinking (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 1 benchmarks (GPQA), while Gemini 2.0 Flash Thinking 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 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Sep 2025

Choose Gemini 2.0 Flash Thinking if…

  • you are already invested in the Google ecosystem

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude Sonnet 4.5 outperforms in 1 benchmarks (GPQA), while Gemini 2.0 Flash Thinking is better at 0 benchmarks.

Claude Sonnet 4.5 significantly outperforms across most benchmarks.

Sat Jun 27 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 2.0 Flash Thinking
Input- tokens
Output- tokens
Sat Jun 27 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Sonnet 4.5 and Gemini 2.0 Flash Thinking support multimodal inputs.

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

Claude Sonnet 4.5

Text
Images
Audio
Video

Gemini 2.0 Flash Thinking

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 2.0 Flash Thinking

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Sonnet 4.5 was released on 2025-09-29, while Gemini 2.0 Flash Thinking was released on 2025-01-21.

Claude Sonnet 4.5 is 8 months newer than Gemini 2.0 Flash Thinking.

Claude Sonnet 4.5

Sep 29, 2025

9 months ago

8mo newer
Gemini 2.0 Flash Thinking

Jan 21, 2025

1.4 years ago

Knowledge Cutoff

When training data ends

Claude Sonnet 4.5 has a knowledge cutoff of 2025-01-31, while Gemini 2.0 Flash Thinking has a cutoff of 2024-08-01.

Claude Sonnet 4.5 has more recent training data (up to 2025-01-31), making it potentially better informed about events through that date compared to Gemini 2.0 Flash Thinking (2024-08-01).

Claude Sonnet 4.5

Jan 2025

5 mo newer
Gemini 2.0 Flash Thinking

Aug 2024

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Higher GPQA score (83.4% vs 74.2%)
Google

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

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Claude Sonnet 4.5 and Gemini 2.0 Flash Thinking side-by-side, then vote on the output you prefer.

Claude Sonnet 4.5
✓ Preferred
Gemini 2.0 Flash Thinking
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Sonnet 4.5
Google
Gemini 2.0 Flash Thinking

FAQ

Common questions about Claude Sonnet 4.5 vs Gemini 2.0 Flash Thinking.

Which is better, Claude Sonnet 4.5 or Gemini 2.0 Flash Thinking?

Claude Sonnet 4.5 significantly outperforms across most benchmarks. Claude Sonnet 4.5 is made by Anthropic and Gemini 2.0 Flash Thinking 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 2.0 Flash Thinking 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 2.0 Flash Thinking scores MMMU: 75.4%, GPQA: 74.2%, AIME 2024: 73.3%.

What are the context window sizes for Claude Sonnet 4.5 and Gemini 2.0 Flash Thinking?

Claude Sonnet 4.5 supports 200K tokens and Gemini 2.0 Flash Thinking supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Claude Sonnet 4.5 and Gemini 2.0 Flash Thinking?

Claude Sonnet 4.5 is developed by Anthropic and Gemini 2.0 Flash Thinking is developed by Google.

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