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Gemini 2.5 Flash vs GPT-5 Codex
Comprehensive side-by-side LLM comparison
GPT-5 Codex leads with 14.1% higher average benchmark score. Gemini 2.5 Flash supports multimodal inputs. Gemini 2.5 Flash is available on 2 providers. Overall, GPT-5 Codex is the stronger choice for coding tasks.
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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.
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OpenAI
GPT-5 Codex was developed as a specialized variant of GPT-5 optimized for programming and software development tasks. Built to understand and generate code across multiple programming languages, it serves developers with enhanced capabilities for code completion, debugging, translation, and explanation of complex codebases.
3 months newer
Gemini 2.5 Flash
2025-05-20
GPT-5 Codex
OpenAI
2025-09-15
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Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Gemini 2.5 Flash
Average Score:60.4%
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GPT-5 Codex
Average Score:74.5%(+14.1%)
Performance comparison across key benchmark categories
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Gemini 2.5 Flash
Coding60.4%
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GPT-5 Codex
Coding74.5%(+14.1%)
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Knowledge Cutoff
Training data recency comparison
GPT-5 Codex
2024-09-30
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 2.5 Flash
2 providers
Throughput: 85 tok/s
Latency: 0.7ms
ZeroEval
Throughput: 85 tok/s
Latency: 0.7ms
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Gemini 2.5 Flash
Avg Score:60.4%
Providers:2
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GPT-5 Codex
Avg Score:74.5%(+14.1%)
Providers:0