Aion-2.0
VerifiedAion-2.0 handles extended text contexts up to 131k tokens.
About Aion-2.0
Aion-2.0 is developed as a closed-source LLM by Aion-labs. Its architecture supports text modality exclusively with a context length of 131072 tokens. Parameter count details are not publicly specified.
The model's primary strength lies in its ability to process lengthy text sequences without truncation. This design suits applications where maintaining coherence across extended inputs is essential. Users access it through Aion-labs' controlled interfaces.
Typical usage includes document analysis, multi-turn dialogue, and content generation requiring broad context retention. Developers integrate it into workflows that demand reliable handling of large textual data volumes.
Capabilities
How Aion-2.0 compares
Aion-2.0 (striped bar) vs other language models on intelligence, speed and price.
Price
USD per 1M output tokens · Lower is better · Aion-2.0 ranks #56 of 78
Sources: Artificial Analysis (intelligence, speed) · OpenRouter (price).
Best for
Processing extensive documents
Aion-2.0 handles long-context reasoning across 131072 tokens, making it effective for reviewing full-length reports or multi-chapter manuscripts in a single pass.
Building conversational agents
Its dialogue management and instruction following capabilities support creating responsive chat systems that maintain context over extended interactions.
Summarizing and answering queries on large inputs
The model performs content summarization and question answering on lengthy texts, enabling efficient extraction of key insights from books or datasets.
Strengths & limitations
Strengths
- +Very large context window for document-level tasks
- +General-purpose text processing
- +Suitable for extended conversations or analysis
Limitations
- –Text modality only
- –No native vision or multimodal support
- –Capabilities depend on undisclosed training data
Cost calculator
Estimate what Aion-2.0 would cost for your usage.
Based on Aion-2.0's $0.80/1M input · $1.60/1M output. Estimate only — actual cost varies by provider and caching.
Quick start
OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. Only the model slug changes between models.
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://openrouter.ai/api/v1",
apiKey: process.env.OPENROUTER_API_KEY,
});
const completion = await client.chat.completions.create({
model: "aion-labs/aion-2.0",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(completion.choices[0].message.content);Model slug: aion-labs/aion-2.0
Editor's verdict
Aion-2.0 is Aion-labs's proprietary language models with a 131K-token context window.
At $1.60 per 1M output tokens, it is mid-priced for its class.
It is available through Aion-labs's API and aggregators like OpenRouter.
Best suited to very large context window for document-level tasks and general-purpose text processing.
Frequently asked questions
Aion-2.0 provides a context window of 131072 tokens.
User reviews
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