Equinox-31B

Equinox draws its name from the balance between extremes. Trained on a balanced blend of Wayfarer 2's unforgiving dark adventures and Hearthfire's quiet slice-of-life storytelling, Equinox is equally at home in perilous dungeons and candlelit conversations.

If you want to easily try this model, you can do so at https://aidungeon.com. Note that Equinox requires a subscription to use.

We plan to continue improving and open-sourcing similar models, so please share any and all feedback on how we can improve model behavior. Below we share more details on how Equinox was created.

Quantized GGUF weights can be downloaded here.

Model details

Equinox 31B was trained with two epochs of SFT (Supervised Fine-Tuning) on top of Gemma 4 31B Instruct, using a balanced dataset that combines two distinct creative directions:

Wayfarer 2 data — Dark, consequence-driven text adventures where choices carry weight, the world pushes back, and survival is never guaranteed. This is the grit and edge of Equinox.

Hearthfire data — Longform writing focused on slice-of-life, character depth, and emotional beats. Extended scenes where nothing "happens" but everything matters. This is the warmth and patience of Equinox.

Both datasets are primarily second-person present tense, supplemented with a smaller third-person dataset in the same narrative style.

Inference

The following settings are recommended as a baseline. Nothing stops you from experimenting with these, of course.

"temperature": 0.8,
"repetition_penalty": 1.05,
"min_p": 0.025

Limitations

As a balanced model, Equinox occupies a middle ground by design. If you specifically want maximally grim, unforgiving storytelling, Harbinger or Wayfarer 2 may better suit your needs. For pure atmospheric slowburn, Hearthfire remains the specialist.

No reasoning datasets were included during training.

Prompt Format

Gemma 4's native chat template was used, and thinking mode is suppressed by default.

<bos><|turn>system
You're a masterful storyteller and gamemaster. Write in second person present tense (You are), crafting vivid, engaging narratives with authority and confidence.<turn|>
<|turn>user
> You peer into the darkness.<turn|>
<|turn>model
<|channel>thought
<channel|>You have been eaten by a grue.

GAME OVER<turn|>