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Gemini 1.5 Flash vs Gemini 2.5 Flash
Comprehensive side-by-side LLM comparison
Gemini 1.5 Flash leads with 18.6% 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 1.5 Flash is the stronger choice for coding tasks.
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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.
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Gemini 2.5 Flash is a multimodal language model developed by Google. It achieves strong performance with an average score of 62.5% across 14 benchmarks. It excels particularly in Global-MMLU-Lite (88.4%), AIME 2024 (88.0%), FACTS Grounding (85.3%). With a 1.1M token context window, it can handle extensive documents and complex multi-turn conversations. 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 Google's latest advancement in AI technology.
1 year newer
Gemini 1.5 Flash
2024-05-01
Gemini 2.5 Flash
2025-05-20
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 32 common benchmarks
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Gemini 1.5 Flash
Average Score:45.9%(+18.6%)
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Gemini 2.5 Flash
Average Score:27.3%
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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:45.9%(+18.6%)
Providers:1
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Gemini 2.5 Flash
Avg Score:27.3%
Providers:2