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Gemini 1.5 Flash vs GPT-5 Codex
Comprehensive side-by-side LLM comparison
Gemini 1.5 Flash leads with 60.6% higher average benchmark score. Gemini 1.5 Flash supports multimodal inputs. 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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OpenAI
GPT-5 Codex is a language model developed by OpenAI. It achieves strong performance with an average score of 74.5% across 1 benchmarks. Notable strengths include SWE-Bench Verified (74.5%). Released in 2025, it represents OpenAI's latest advancement in AI technology.
1 year newer
Gemini 1.5 Flash
2024-05-01
GPT-5 Codex
OpenAI
2025-09-15
Performance Metrics
Context window and performance specifications
Average performance across 23 common benchmarks
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Gemini 1.5 Flash
Average Score:63.9%(+60.6%)
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GPT-5 Codex
Average Score:3.2%
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Knowledge Cutoff
Training data recency comparison
Gemini 1.5 Flash
2023-11-01
GPT-5 Codex
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 Codex
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Gemini 1.5 Flash
Avg Score:63.9%(+60.6%)
Providers:1
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GPT-5 Codex
Avg Score:3.2%
Providers:0