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Gemini 1.5 Flash vs GPT-5
Comprehensive side-by-side LLM comparison
GPT-5 leads with 18.9% higher average benchmark score. Gemini 1.5 Flash offers 528.8K more tokens in context window than GPT-5. Gemini 1.5 Flash is $10.50 cheaper per million tokens. Overall, GPT-5 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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OpenAI
GPT-5 is a multimodal language model developed by OpenAI. It achieves strong performance with an average score of 70.1% across 35 benchmarks. It excels particularly in SWE-Lancer (IC-Diamond subset) (100.0%), COLLIE (99.0%), Tau2 Telecom (96.7%). It supports a 528K token context window for handling large documents. 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 OpenAI's latest advancement in AI technology.
1 year newer
Gemini 1.5 Flash
2024-05-01
GPT-5
OpenAI
2025-08-07
Pricing Comparison
Cost per million tokens (USD)
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Gemini 1.5 Flash
Input:$0.15
Output:$0.60($10.50 cheaper)
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GPT-5
Input:$1.25
Output:$10.00
Performance Metrics
Context window and performance specifications
Average performance across 52 common benchmarks
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Gemini 1.5 Flash
Average Score:28.2%
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GPT-5
Average Score:47.2%(+18.9%)
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Knowledge Cutoff
Training data recency comparison
Gemini 1.5 Flash
2023-11-01
GPT-5
2024-09-30
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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GPT-5
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Gemini 1.5 Flash
Avg Score:28.2%
Providers:1
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GPT-5
Avg Score:47.2%(+18.9%)
Providers:2