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DeepSeek-V3.1 vs GPT-5 Codex
Comprehensive side-by-side LLM comparison
GPT-5 Codex leads with 8.5% higher average benchmark score. DeepSeek-V3.1 is available on 2 providers. Overall, GPT-5 Codex is the stronger choice for coding tasks.
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DeepSeek
DeepSeek-V3.1 was developed as an incremental advancement over DeepSeek-V3, designed to refine the mixture-of-experts architecture with improved training techniques. Built to enhance quality and efficiency while maintaining the open-source philosophy, it represents continued iteration on DeepSeek's flagship model line.
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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.
8 months newer
DeepSeek-V3.1
DeepSeek
2025-01-10
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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DeepSeek-V3.1
Average Score:66.0%
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GPT-5 Codex
Average Score:74.5%(+8.5%)
Performance comparison across key benchmark categories
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DeepSeek-V3.1
Coding66.0%
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GPT-5 Codex
Coding74.5%(+8.5%)
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Knowledge Cutoff
Training data recency comparison
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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DeepSeek-V3.1
2 providers
DeepInfra
Novita
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GPT-5 Codex
0 providers
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DeepSeek-V3.1
Avg Score:66.0%
Providers:2
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GPT-5 Codex
Avg Score:74.5%(+8.5%)
Providers:0