A compilation of over 1 million diverse, high-quality synthetic instruction datasets. Famous for producing 'Hermes' models that often punch above their weight class.
Dataset Details
Provider
Teknium
Category
Instruction / SFT
Size
1M Rows
License
Apache 2.0
Downloads
500k
Tags
Synthetic, Chat, Roleplay, Code
from datasets import load_dataset
ds = load_dataset("teknium/OpenHermes-2.5")
Fine-tune with this dataset
Estimated VRAM to fine-tune with QLoRA (4-bit base model + LoRA adapters), using conservative defaults:
Yes — OpenHermes 2.5 is released under Apache 2.0, a permissive license that allows commercial use, including training models you ship in a product. Check the dataset card for attribution requirements before release.
How much data does OpenHermes 2.5 contain, and do I need all of it?
OpenHermes 2.5 contains 1M Rows. You rarely need all of it: for style and format fine-tuning, a few hundred to a few thousand examples are enough — load a slice (e.g. split="train[:1000]") and scale up only if quality plateaus.
What is OpenHermes 2.5 best used for?
The default general-purpose SFT mix for 7B-13B fine-tunes. It belongs to the Instruction / SFT section of our dataset hub, where you'll find alternatives and complementary sets.