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Gemini 1.5 Flash vs Gemini 2.5 Flash
Comprehensive side-by-side LLM comparison
Gemini 2.5 Flash leads with 6.5% higher average benchmark score. Gemini 2.5 Flash offers 57.3K more tokens in context window than Gemini 1.5 Flash. Gemini 1.5 Flash is $2.05 cheaper per million tokens. Overall, Gemini 2.5 Flash is the stronger choice for coding 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.
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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.
1 year newer
Gemini 1.5 Flash
2024-05-01
Gemini 2.5 Flash
2025-05-20
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Pricing Comparison
Cost per million tokens (USD)
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Gemini 1.5 Flash
Input:$0.15
Output:$0.60($2.05 cheaper)
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Gemini 2.5 Flash
Input:$0.30
Output:$2.50
Performance Metrics
Context window and performance specifications
Average performance across 4 common benchmarks
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Gemini 1.5 Flash
Average Score:58.5%
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Gemini 2.5 Flash
Average Score:65.0%(+6.5%)
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Knowledge Cutoff
Training data recency comparison
Gemini 1.5 Flash
2023-11-01
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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Gemini 1.5 Flash
1 providers
Throughput: 150 tok/s
Latency: 0.3ms
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Gemini 2.5 Flash
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Gemini 1.5 Flash
Avg Score:58.5%
Providers:1
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Gemini 2.5 Flash
Avg Score:65.0%(+6.5%)
Providers:2