What is the context window of AionLabs: Aion-2.5 by NanoGPT?

AionLabs: Aion-2.5 by NanoGPT has a context window of 131K tokens. It supports up to 131K input tokens and can generate up to 33K output tokens.

What input and output types does AionLabs: Aion-2.5 support?

AionLabs: Aion-2.5 by NanoGPT accepts text as input and can generate text as output.

Is AionLabs: Aion-2.5 by NanoGPT open source?

No, AionLabs: Aion-2.5 by NanoGPT has closed weights. The model is only available through the NanoGPT API.

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AionLabs: Aion-2.5 API

NanoGPT

About

Process massive datasets with AionLabs: Aion-2.5, featuring an expansive 131K context window for long-document analysis. This model delivers cost-effective pricing at $1.00/1M input and $3.00/1M output tokens. Access AionLabs: Aion-2.5 via the NanoGPT API with up to 33K output tokens.

Capabilities

Input Modalities

text

Output Modalities

text

Reasoning

Structured Output

Tool Use

WeightsClosed

Temperature

Fixed

Attachment

Not Supported

Limits

Context Window

131K

Tokens

Input Limit

131K

Tokens

Max Output

33K

Tokens

Pricing

Standard (per 1M tokens)

Input

$1.00

Output

$3.00

Caching (per 1M tokens)

Read

$0.35

Frequently Asked Questions

AionLabs: Aion-2.5 by NanoGPT costs $1.00 per 1M input tokens and $3.00 per 1M output tokens. Cached reads cost $0.35 per 1M tokens.

Model Details

aion-labs/aion-2.5

Provider

NanoGPT

Family

Release Date

Mar 20, 2026

Knowledge Cutoff

N/A

API Integration

NPM Package

@ai-sdk/openai-compatible

Environment Variables

NANO_GPT_API_KEY

API Base URL

https://nano-gpt.com/api/v1

Documentation