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Claude Sonnet 4.5 vs Gemini 2.5 Flash
Comprehensive side-by-side LLM comparison
Gemini 2.5 Flash leads with 9.6% higher average benchmark score. Gemini 2.5 Flash offers 850.1K more tokens in context window than Claude Sonnet 4.5. Gemini 2.5 Flash is $15.20 cheaper per million tokens. Overall, Gemini 2.5 Flash is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4.5 is a multimodal language model developed by Anthropic. It achieves strong performance with an average score of 75.8% across 9 benchmarks. It excels particularly in MMMLU (89.1%), AIME 2025 (87.0%), TAU-bench Retail (86.2%). It supports a 264K token context window for handling large documents. The model is available through 2 API providers. As a multimodal model, it can process and understand text, images, and other input formats seamlessly. Released in 2025, it represents Anthropic's latest advancement in AI technology.
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Gemini 2.5 Flash is a multimodal language model developed by Google. It achieves strong performance with an average score of 62.5% across 14 benchmarks. It excels particularly in Global-MMLU-Lite (88.4%), AIME 2024 (88.0%), FACTS Grounding (85.3%). With a 1.1M token context window, it can handle extensive documents and complex multi-turn conversations. The model is available through 2 API providers. As a multimodal model, it can process and understand text, images, and other input formats seamlessly. Released in 2025, it represents Google's latest advancement in AI technology.
4 months newer
Gemini 2.5 Flash
2025-05-20
Claude Sonnet 4.5
Anthropic
2025-09-29
Pricing Comparison
Cost per million tokens (USD)
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Claude Sonnet 4.5
Input:$3.00
Output:$15.00
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Gemini 2.5 Flash
Input:$0.30
Output:$2.50($15.20 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 20 common benchmarks
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Claude Sonnet 4.5
Average Score:34.1%
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Gemini 2.5 Flash
Average Score:43.7%(+9.6%)
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4.5
2025-01-31
Gemini 2.5 Flash
2025-01-31
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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Claude Sonnet 4.5
2 providers
Anthropic
Throughput: 42 tok/s
Latency: 0.4ms
ZeroEval
Throughput: 42 tok/s
Latency: 0.4ms
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Claude Sonnet 4.5
Avg Score:34.1%
Providers:2
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Gemini 2.5 Flash
Avg Score:43.7%(+9.6%)
Providers:2