GPT-5.3-CodexvsQwen3-Coder
GPT-5.3-Codex | Qwen3-Coder | |
|---|---|---|
| Specifications | ||
Parameters | — | 480B |
Context window | — | 256k |
| 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%Best | 20% |
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 | — |
| Overview | ||
| Company | OpenAI | Qwen |
| Release date | Feb 5 2026 | Jul 22 2025 |
| Access | Proprietary | Open Weight |
Which is better: GPT-5.3-Codex or Qwen3-Coder?
GPT-5.3-Codex leads Qwen3-Coder on 1 of the 1 benchmark they both report (BullshitBench v2). Qwen3-Coder shipped 198 days before GPT-5.3-Codex, so benchmark comparisons should account for the intervening progress.
GPT-5.3-Codex is proprietary, while Qwen3-Coder is open weight.
On BullshitBench v2, GPT-5.3-Codex leads at 24% vs Qwen3-Coder at 20%.
Frequently asked questions
GPT-5.3-Codex was released by OpenAI on Feb 5 2026.
Qwen3-Coder was released by Qwen on Jul 22 2025.
GPT-5.3-Codex is a proprietary model released by OpenAI. Qwen3-Coder is an open weight model released by Qwen.
Other comparisons
GPT-5.3-CodexvsClaude Opus 5Qwen3-CodervsClaude Opus 5GPT-5.3-CodexvsGemini 3.6 FlashQwen3-CodervsGemini 3.6 FlashGPT-5.3-CodexvsMuse Spark 1.2Qwen3-CodervsMuse Spark 1.2GPT-5.3-CodexvsGrok 4.5Qwen3-CodervsGrok 4.5GPT-5.3-CodexvsDeepSeek-V4-Flash-0731Qwen3-CodervsDeepSeek-V4-Flash-0731GPT-5.3-CodexvsMistral Medium 3.5Qwen3-CodervsMistral Medium 3.5