Models/Character Chat LLM API/Cydonia & Aion/Text to Text API

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Cydonia Character Chat API — Cydonia 24B v4.1 and Aion Llama 3.1 8B

The Cydonia Character Chat API gives you programmatic access to Cydonia 24B v4.1 and Aion Llama 3.1 8B through one Muapi API key. Every endpoint takes the same request body: prompt, optional system_prompt, max_tokens.These are community fine-tunes tuned for creative writing, character chat, interactive fiction, and story writing; they are not abliterated. Muapi's acceptable-use policy applies to everything you generate. No model here is a promise of unrestricted output, and you remain responsible for how you use it.

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Cydonia 24B v4.1

Long-context character chat and story writing at a low token rate1 models

Text GenerationLiveFeatured

Cydonia 24B v4.1

Cydonia 24B v4.1, a community fine-tune tuned for creative writing, character chat, and interactive fiction, with a 131K-token context window.

Text in

$0.70/M in · $1.10/M out

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Aion Llama 3.1 8B

Compact character chat and chat1 models

Text GenerationLive

Aion Llama 3.1 8B

Aion Llama 3.1 8B, a compact fine-tune of Llama 3.1 8B for character chat with a 32K-token context window.

Text in

$1.60/M in · $3.20/M out

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What is the Cydonia Character Chat API?

This page covers Cydonia 24B v4.1 and Aion Llama 3.1 8B on Muapi. Cydonia 24B v4.1, a community fine-tune tuned for creative writing, character chat, and interactive fiction, with a 131K-token context window. Aion Llama 3.1 8B, a compact fine-tune of Llama 3.1 8B for character chat with a 32K-token context window.

Submit a prompt, optionally with a system_prompt to set persona and tone, and poll for the generated text. Typical uses include character chat, interactive fiction and text adventures, long-form story writing, and character chat in your own app. These are community fine-tunes tuned for creative writing, character chat, interactive fiction, and story writing; they are not abliterated. Muapi's acceptable-use policy applies to everything you generate. No model here is a promise of unrestricted output, and you remain responsible for how you use it.

Key Capabilities

2 Models, One API

Every endpoint accepts the same request body and returns text through the shared result endpoint, so switching models is a one-line change.

Tuned for Creative Writing

These models are fine-tuned on fiction and character chat data, so they tend to hold a character, keep a narrative voice, and write longer, more vivid prose than general assistants.

System Prompt Control

Set a system_prompt to steer persona, tone, and output format for creative, analytical, or evaluation work.

Pay Per Token

Billing follows the token counts each call returns. There is no subscription and no model hosting to manage.

Long-Form Text Generation

Use these models for chat, drafting, and step-by-step reasoning.

Acceptable-Use Policy Applies

Reduced refusals do not mean no rules. Muapi's acceptable-use policy and applicable law still apply to what you generate.

Pricing

Endpoint	Input	Output	Price	Best For
cydonia-24b-v4-1	Prompt + system_prompt, max_tokens	Complete text response (poll for result)	$0.70/M in · $1.10/M out	Long-context character chat and story writing at a low token rate
aion-llama-3-1-8b	Prompt + system_prompt, max_tokens	Complete text response (poll for result)	$1.60/M in · $3.20/M out	Compact character chat and chat

Billed per token from the usage each call returns; prices are per million input and output tokens.

How to Call the Cydonia Character Chat API

Submit a JSON request with your Muapi API key, save the request ID, and poll the shared result endpoint.

1. Submit a prompt to Cydonia 24B v4.1

curl -X POST https://api.muapi.ai/api/v1/cydonia-24b-v4-1 \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"prompt": "You are Mira, a wry tavern keeper. Greet a stranger who just walked in from the rain.", "system_prompt": "You are a candid, detail-oriented assistant.", "max_tokens": 1024}'

# Response: {"request_id":"REQUEST_ID"}

Call cydonia-24b-v4-1 with a prompt and optional system_prompt.

2. Submit a prompt to Aion Llama 3.1 8B

curl -X POST https://api.muapi.ai/api/v1/aion-llama-3-1-8b \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"prompt": "Play a friendly dragon guarding a library and answer my first question.", "system_prompt": "You are a candid, detail-oriented assistant.", "max_tokens": 1024}'

# Response: {"request_id":"REQUEST_ID"}

Call aion-llama-3-1-8b with a prompt and optional system_prompt.

3. Poll the result

curl https://api.muapi.ai/api/v1/predictions/REQUEST_ID/result \
  -H "x-api-key: YOUR_API_KEY"

# Poll until status is completed, then read the generated text from outputs.

Poll the shared result endpoint until the task is completed, then read the generated text from outputs.

Frequently Asked Questions

What is a character chat LLM?

A character chat LLM is a language model fine-tuned on fiction, dialogue and character chat data so it holds a character, keeps a narrative voice, and writes longer, more vivid prose. The models on this page are community fine-tunes tuned for creative writing, not abliterated versions of general assistants.

Which models does the Cydonia Character Chat API include?

Cydonia 24B v4.1 and Aion Llama 3.1 8B. Each is a separate endpoint with its own model name in the URL.

How much does it cost?

Billing is per token, deducted after each call from the counts the model returns. Rates start at $0.70 per million input tokens; see the pricing table for every model.

Will these models answer anything I ask?

No. Reduced refusals do not mean unrestricted output, and each model's knowledge and quality still bound the answer. You are responsible for how you use the output, and requests that violate Muapi's acceptable-use policy or the law are not permitted.

Can I send images to these models?

No. Every model on this page is text in, text out.

How do I get the result?

POST to /api/v1/<model-name> returns a request_id. Poll /api/v1/predictions/{request_id}/result until the status is completed, then read the text from outputs.

Can I use these for a character or storytelling app?

Yes: set a system_prompt with the character's persona and send the running conversation in the prompt. Muapi's acceptable-use policy applies, and you are responsible for moderating your own product.

Browse the full Character Chat LLM API lineup →All 12 models on the Character Chat LLM API, side by side with pricing.Explore the Llama Character Chat API →8 models.Explore the Qwen Character Chat API →Qwen 3.8 27B Queen and Qwen 3.8 27B Fable See the Abliterated LLM API →20 models on the Abliterated LLM API.See the Low-Refusal LLM API →2 models on the Low-Refusal LLM API.Browse every LLM on Muapi →Compare these models against GPT, Claude, Gemini, DeepSeek and every other language model in the catalog.

Ready to build with the Cydonia Character Chat API?

Create one Muapi API key and call every model on this page with a plain REST request.

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