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Claude Sonnet 4.5 vs Gemini 2.5 Flash
Comprehensive side-by-side LLM comparison
Claude Sonnet 4.5 leads with 10.8% 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, 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 2.5 Flash represents a continued evolution of Google's efficient multimodal models, designed to deliver enhanced capabilities while maintaining the performance characteristics valued in the Flash series. Built to serve high-throughput applications with improved quality, it advances the balance between speed and intelligence.
4 months newer
Gemini 2.5 Flash
2025-05-20
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 2.5 Flash
Input:$0.30
Output:$2.50($15.20 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 3 common benchmarks
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Claude Sonnet 4.5
Average Score:82.5%(+10.8%)
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Gemini 2.5 Flash
Average Score:71.7%
Performance comparison across key benchmark categories
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Claude Sonnet 4.5
Coding77.2%(+16.8%)
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Gemini 2.5 Flash
Coding60.4%
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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:82.5%(+10.8%)
Providers:2
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Gemini 2.5 Flash
Avg Score:71.7%
Providers:2