GPT-5.2 vs K2 Horizon 375B-A23B
GPT-5.2 and K2 Horizon 375B-A23B are closely matched at 40.7 and 38.5 on the LLM Stats Score.
OpenAI · Institute of Foundation Models · Updated for 2026
Which is better?
GPT-5.2 and K2 Horizon 375B-A23B are closely matched on the overall LLM Stats Score at 40.7 and 38.5.
In the 3 individual benchmarks reported for both models, GPT-5.2 wins 2; 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-5.2
- you value its reported benchmark strengths — it wins 2 of 3 exact shared results
Choose K2 Horizon 375B-A23B
- you want the most recent training data — it shipped Sep 2026
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
24 reported for GPT-5.2 · 18 for K2 Horizon 375B-A23B
GPT-5.2 outperforms in 2 benchmarks (GPQA, Humanity's Last Exam), while K2 Horizon 375B-A23B is better at 1 benchmark (BrowseComp).
GPT-5.2 shows notably better performance in the majority of benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Context Window
Maximum input and output token capacity
Only GPT-5.2 specifies input context (400,000 tokens). Only GPT-5.2 specifies output context (128,000 tokens).
Input capabilities
Documented input modalities across available providers
GPT-5.2 supports multimodal inputs, whereas K2 Horizon 375B-A23B does not.
GPT-5.2 can handle both text and other forms of data like images, making it suitable for multimodal applications.
GPT-5.2
K2 Horizon 375B-A23B
License
Usage and distribution terms
GPT-5.2 is licensed under a proprietary license, while K2 Horizon 375B-A23B 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-5.2 was released on 2025-12-11, while K2 Horizon 375B-A23B was released on 2026-09-03.
K2 Horizon 375B-A23B is 9 months newer than GPT-5.2.
Dec 11, 2025
10 months ago
Sep 3, 2026
1 months ago
8mo newerKnowledge Cutoff
When training data ends
GPT-5.2 has a documented knowledge cutoff of 2025-08-25, while K2 Horizon 375B-A23B's cutoff date is not specified.
We can confirm GPT-5.2's training data extends to 2025-08-25, but cannot make a direct comparison without K2 Horizon 375B-A23B's cutoff date.
Aug 2025
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Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5.2 and K2 Horizon 375B-A23B side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5.2 vs K2 Horizon 375B-A23B.