DeepSeek Coder vs GPT-5.3-Codex
DeepSeek DeepSeek Coder | OpenAI GPT-5.3-Codex | |
|---|---|---|
| Overview | ||
| Company | DeepSeek | OpenAI |
| Release date | Nov 2 2023 | Feb 5 2026 |
| Access | Open Weight | Proprietary |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | — | 24% |
Next.js coding Next.js EvalsVercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | — | 83% |
Community preference (code) Arena Elo (Code)Like the text arena, but people vote on which AI writes better code. The votes become a chess-style Elo rating on arena.ai. Higher is better. | — | 1406 |
| Timeline | ||
| Release gap | DeepSeek Coder shipped 826 days before GPT-5.3-Codex | |
Which is better: DeepSeek Coder or GPT-5.3-Codex?
DeepSeek Coder and GPT-5.3-Codex don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. DeepSeek Coder shipped 826 days before GPT-5.3-Codex, so benchmark comparisons should account for the intervening progress.
DeepSeek Coder is open weight, while GPT-5.3-Codex is proprietary.
Direct benchmark comparisons are unavailable — DeepSeek Coder and GPT-5.3-Codex don't publish scores on any of the same benchmarks.
Frequently asked questions
DeepSeek Coder was released by DeepSeek on Nov 2 2023.
GPT-5.3-Codex was released by OpenAI on Feb 5 2026.
DeepSeek Coder is an open weight model released by DeepSeek. GPT-5.3-Codex is a proprietary model released by OpenAI.
Other comparisons
DeepSeek Coder vs Claude Sonnet 5GPT-5.3-Codex vs Claude Sonnet 5DeepSeek Coder vs Gemini OmniGPT-5.3-Codex vs Gemini OmniDeepSeek Coder vs Muse Spark 1.1GPT-5.3-Codex vs Muse Spark 1.1DeepSeek Coder vs Grok 4.5GPT-5.3-Codex vs Grok 4.5DeepSeek Coder vs Mistral Medium 3.5GPT-5.3-Codex vs Mistral Medium 3.5DeepSeek Coder vs Kimi K2.7 CodeGPT-5.3-Codex vs Kimi K2.7 Code