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Gemini 1.5 Pro vs Gemini 2.5 Flash
Comprehensive side-by-side LLM comparison
Both models show comparable benchmark performance. Gemini 1.5 Pro offers 991.2K more tokens in context window than Gemini 2.5 Flash. Gemini 2.5 Flash is $9.70 cheaper per million tokens. Both models have their strengths depending on your specific coding needs.
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Gemini 1.5 Pro was introduced as Google's advanced multimodal model with an expanded context window, designed to comprehend and reason across long documents, videos, and audio. Built to handle complex, information-rich tasks, it brought breakthrough capabilities in processing extended context while maintaining high-quality reasoning and generation.
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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 Pro
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 Pro
Input:$2.50
Output:$10.00
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Gemini 2.5 Flash
Input:$0.30
Output:$2.50($9.70 cheaper)
Performance Metrics
Context window and performance specifications
Average performance across 4 common benchmarks
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Gemini 1.5 Pro
Average Score:65.4%(+0.4%)
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Gemini 2.5 Flash
Average Score:65.0%
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Knowledge Cutoff
Training data recency comparison
Gemini 1.5 Pro
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 Pro
1 providers
Throughput: 85 tok/s
Latency: 0.7ms
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Gemini 2.5 Flash
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Gemini 1.5 Pro
Avg Score:65.4%(+0.4%)
Providers:1
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Gemini 2.5 Flash
Avg Score:65.0%
Providers:2