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Gemini 1.5 Pro vs Gemini 2.5 Flash
Comprehensive side-by-side LLM comparison
Gemini 1.5 Pro leads with 24.1% higher average benchmark score. 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. Overall, Gemini 1.5 Pro is the stronger choice for coding tasks.
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Gemini 1.5 Pro is a multimodal language model developed by Google. It achieves strong performance with an average score of 72.6% across 23 benchmarks. It excels particularly in XSTest (98.8%), HellaSwag (93.3%), GSM8k (90.8%). With a 2.1M 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 Pro
2024-05-01
Gemini 2.5 Flash
2025-05-20
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 33 common benchmarks
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Gemini 1.5 Pro
Average Score:50.6%(+24.1%)
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Gemini 2.5 Flash
Average Score:26.5%
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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:50.6%(+24.1%)
Providers:1
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Gemini 2.5 Flash
Avg Score:26.5%
Providers:2