Comprehensive side-by-side LLM comparison
GPT-5 Codex leads with 57.7% higher average benchmark score. DeepSeek-V2.5 is available on 3 providers. Overall, GPT-5 Codex is the stronger choice for coding tasks.
DeepSeek
DeepSeek-V2.5 was developed as an enhanced iteration of the DeepSeek-V2 architecture, designed to incorporate improvements in model quality and efficiency. Built to advance the DeepSeek foundation model series, it provides refined capabilities for general-purpose language understanding and generation tasks.
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.
1 year newer

DeepSeek-V2.5
DeepSeek
2024-05-08

GPT-5 Codex
OpenAI
2025-09-15
Context window and performance specifications
Average performance across 1 common benchmarks

DeepSeek-V2.5

GPT-5 Codex
Performance comparison across key benchmark categories

DeepSeek-V2.5

GPT-5 Codex
GPT-5 Codex
2024-09-30
Available providers and their performance metrics

DeepSeek-V2.5
DeepInfra
DeepSeek
Hyperbolic

DeepSeek-V2.5

GPT-5 Codex

DeepSeek-V2.5

GPT-5 Codex

GPT-5 Codex