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Claude Sonnet 4.5 vs Gemini 1.5 Flash
Comprehensive side-by-side LLM comparison
Gemini 1.5 Flash leads with 26.2% higher average benchmark score. Gemini 1.5 Flash offers 792.8K more tokens in context window than Claude Sonnet 4.5. Gemini 1.5 Flash is $17.25 cheaper per million tokens. Overall, Gemini 1.5 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 1.5 Flash is a multimodal language model developed by Google. It achieves strong performance with an average score of 66.8% across 22 benchmarks. It excels particularly in XSTest (97.0%), HellaSwag (86.5%), GSM8k (86.2%). With a 1.1M token context window, it can handle extensive documents and complex multi-turn conversations. The model is available through 1 API provider. As a multimodal model, it can process and understand text, images, and other input formats seamlessly. Released in 2024, it represents Google's latest advancement in AI technology.
1 year newer
Gemini 1.5 Flash
2024-05-01
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 1.5 Flash
Input:$0.15
Output:$0.60($17.25 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 30 common benchmarks
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Claude Sonnet 4.5
Average Score:22.7%
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Gemini 1.5 Flash
Average Score:49.0%(+26.2%)
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Knowledge Cutoff
Training data recency comparison
Gemini 1.5 Flash
2023-11-01
Claude Sonnet 4.5
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:22.7%
Providers:2
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Gemini 1.5 Flash
Avg Score:49.0%(+26.2%)
Providers:1