GPT-5 Codex vs Hy4 preview
Hy4 preview leads the LLM Stats Score 51.1 to 26.8.
OpenAI · Tencent · Updated for 2026
Which is better?
Hy4 preview leads the overall LLM Stats Score 51.1 to 26.8, ranking #14 overall.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-5 Codex
- you are already invested in the OpenAI ecosystem
Choose Hy4 preview
- overall performance matters — it scores 51.1 and ranks #14 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you want the most recent training data — it shipped Aug 2026
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Individual benchmarks
1 reported for GPT-5 Codex · 32 for Hy4 preview
GPT-5 Codex and Hy4 previewdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
License
Usage and distribution terms
GPT-5 Codex is licensed under a proprietary license, while Hy4 preview uses Apache 2.0.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
Apache 2.0
Open weights
Release Timeline
When each model was launched
GPT-5 Codex was released on 2025-09-15, while Hy4 preview was released on 2026-08-28.
Hy4 preview is 12 months newer than GPT-5 Codex.
Sep 15, 2025
11 months ago
Aug 28, 2026
1 weeks ago
11mo newerKnowledge Cutoff
When training data ends
GPT-5 Codex has a documented knowledge cutoff of 2024-09-30, while Hy4 preview's cutoff date is not specified.
We can confirm GPT-5 Codex's training data extends to 2024-09-30, but cannot make a direct comparison without Hy4 preview's cutoff date.
Sep 2024
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Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5 Codex and Hy4 preview side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5 Codex vs Hy4 preview.