Aion 3.5 API

Aion 3.5 is a large language model by Aion Labs, available on the Venice API as aion-labs-aion-3-5. Requests are anonymized, so the provider never sees your identity.Aion 3.5 is a multi-model roleplaying and storytelling system from AionLabs, built on the GLM family of models. Multiple specialized models collaborate on each response to produce stronger narrative structure and more compelling tension and conflict. It handles mature and darker themes with nuance and supports tool calling for richer interactive fiction.

Aion 3.5 API pricing

Model ID	Variant	Privacy	Price
`aion-labs-aion-3-5`	Standard	Anonymized	$3.75 input /$ 7.50 output per 1M tokens

Aion 3.5 specifications

Spec	Value
Provider	Aion Labs
Released	Sep 23, 2026
Privacy	Anonymized
Context window	256K tokens
Max output	32K tokens
Reasoning effort	Not adjustable

How to use the Aion 3.5 API

Send requests to POST https://api.venice.ai/api/v1/chat/completions with "model": "aion-labs-aion-3-5" and your API key.

curl https://api.venice.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $VENICE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "aion-labs-aion-3-5",
    "messages": [{ "role": "user", "content": "Explain TEE attestation in two sentences." }]
  }'

Aion 3.5 API FAQ

How much does the Aion 3.5 API cost?

3.75 per 1M input tokens and

7.50 per 1M output tokens, with cached input at $0.94 per 1M. Prices are in USD and can be paid in DIEM at parity.

What is the Aion 3.5 model ID?

Use aion-labs-aion-3-5 as the model parameter.

Is the Aion 3.5 API private?

Aion 3.5 is anonymized: Venice forwards requests to the provider without your identity, but the provider may retain prompt data, so use a private model for sensitive work.

What is the context window of Aion 3.5?

256K tokens of context, with up to 32K output tokens per response.

What does Aion 3.5 support?

Aion 3.5 supports function calling, structured outputs, reasoning, web search and prompt caching.

Which endpoint does the Aion 3.5 API use?

Call POST /chat/completions. /responses (Alpha) is also supported.

Related models

Aion 3.0 API: $3.75 input /$ 7.50 output per 1M tokens
GPT-6 Sol API: $2.50 input /$ 12.50 output per 1M tokens
Qwen 3.8 2.4T API: $2.50 input /$ 7.50 output per 1M tokens
GPT-5.6 Terra API: $2.50 input /$ 15.00 output per 1M tokens
GPT-5.6 Terra Pro API: $2.50 input /$ 15.00 output per 1M tokens

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