GPT-5.3 Codex vs Hy4 preview
Hy4 preview leads the LLM Stats Score 51.5 to 36.8.
OpenAI · Tencent · Updated for 2026
Which is better?
Hy4 preview leads the overall LLM Stats Score 51.5 to 36.8, ranking #10 overall.
In the 1 individual benchmarks reported for both models, Hy4 preview wins 1; this is a narrower head-to-head signal than the composite indexes.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-5.3 Codex
- you want predictable pricing at $1.75/M input and $14.00/M output
Choose Hy4 preview
- overall performance matters — it scores 51.5 and ranks #10 on LLM Stats
- your work emphasizes reasoning and agents — it leads those capability indexes
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- 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
6 reported for GPT-5.3 Codex · 32 for Hy4 preview
GPT-5.3 Codex outperforms in 0 benchmarks, while Hy4 preview is better at 1 benchmark (SWE-Bench Pro).
Hy4 preview significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Context Window
Maximum input and output token capacity
Only GPT-5.3 Codex specifies input context (400,000 tokens). Only GPT-5.3 Codex specifies output context (128,000 tokens).
Input capabilities
Documented input modalities across available providers
GPT-5.3 Codex supports multimodal inputs, whereas Hy4 preview does not.
GPT-5.3 Codex can handle both text and other forms of data like images, making it suitable for multimodal applications.
GPT-5.3 Codex
Hy4 preview
License
Usage and distribution terms
GPT-5.3 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-5.3 Codex was released on 2026-02-05, while Hy4 preview was released on 2026-08-28.
Hy4 preview is 7 months newer than GPT-5.3 Codex.
Feb 5, 2026
6 months ago
Aug 28, 2026
3 days ago
6mo newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5.3 Codex and Hy4 preview side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5.3 Codex vs Hy4 preview.