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Claude Sonnet 4.5 vs Gemini 1.5 Flash
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 32.4% 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, Claude Sonnet 4.5 is the stronger choice for coding tasks.
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Anthropic
Claude Sonnet 4.5 was developed to bridge human thinking and machine assistance, allowing people to work with language and tools in a more conversational and natural way. Built with a focus on turning ideas into results, it represents an evolution in making AI feel less mechanical while maintaining strong capabilities across reasoning, coding, and collaborative tasks.
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Gemini 1.5 Flash was created as a fast and efficient multimodal model, designed to provide quick responses while handling text, images, and other modalities. Built for applications requiring low latency and high throughput, it balances capability with speed to serve real-time and high-volume use cases.
1 year newer
Gemini 1.5 Flash
2024-05-01
Claude Sonnet 4.5
Anthropic
2025-09-29
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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 1 common benchmarks
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Claude Sonnet 4.5
Average Score:83.4%(+32.4%)
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Gemini 1.5 Flash
Average Score:51.0%
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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:83.4%(+32.4%)
Providers:2
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Gemini 1.5 Flash
Avg Score:51.0%
Providers:1