What is Aion-2.0 API?
Aion-2.0 is available through AIMLAPI.
Technical Specifications
- Supported inputs: Image, Text
- Output: Text
- Context window: 131,072 tokens / Max output: 32,768 tokens
- Endpoint: /chat/completions
Performance Benchmarks
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Aion-2.0 API Pricing
- Input: $1.04 / 1M tokens
- Output: $2.08 / 1M tokens
Where to Use Aion-2.0
Coding and code review
Generate, debug, and review code across languages, reading whole files or repos in a single prompt.
Agentic and multi-step workflows
Reliable tool-calling and instruction-following suit agent loops that plan, call tools, and iterate.
Complex reasoning
Extended reasoning improves reliability on multi-step math, logic, and technical analysis.
Long-document analysis
Summarize and extract from contracts, papers, and reports without aggressive chunking.
Code Sample
[embed]
Measured on the AI/ML API gateway across live traffic. Figures are medians unless stated. Last updated 2026-10-12.
Aion-2.0 is documented as suited for immersive roleplaying and storytelling. It is also described as a strong choice for interactive fiction, character-driven chat experiences, and creative writing tools where narrative depth and engagement matter more than raw speed.
It is also suited to introducing tension, crises, and conflict into stories, making narratives feel more engaging. In addition, it handles mature and darker themes with more nuance and depth.
It is described as fitting creative writing and roleplaying workflows. It is also presented as useful for chat experiences centered on characters and narrative interaction.
import requests r = requests.post( "https://api.aimlapi.com/v1/chat/completions", headers={"Authorization": "Bearer " + AIMLAPI_KEY}, json={ "model": "aion-labs/aion-2.0", "messages": [ { "role": "user", "content": "Hello!" } ] }, ) print(r.json())
const r = await fetch("https://api.aimlapi.com/v1/chat/completions", { method: "POST", headers: { Authorization: `Bearer ${process.env.AIMLAPI_KEY}`, "Content-Type": "application/json", }, body: JSON.stringify({ "model": "aion-labs/aion-2.0", "messages": [ { "role": "user", "content": "Hello!" } ] }), }); console.log(await r.json());
curl -X POST https://api.aimlapi.com/v1/chat/completions \ -H "Authorization: Bearer $AIMLAPI_KEY" \ -H "Content-Type: application/json" \ -d '{"model":"aion-labs/aion-2.0","messages":[{"role":"user","content":"Hello!"}]}'
OpenAI-compatible — swap the base URL and it works with your existing SDK.
| Type | Price |
|---|---|
| Input | |
| Output | |
| Cached input |
| Model | Input | Output | Context | Best for |
|---|---|---|---|---|
Aion-2.0 This page | Reasoning + agents | |||
| Reasoning + agents | ||||
| Balanced coding + agents | ||||
| Long-context, multimodal & agentic workflows | ||||
| Reasoning + agents |
Aion-2.0 has a 131,072 tokens context window and can return up to 32,768 tokens.
Aion-2.0 takes image, text as input and returns text.
Use aion-labs/aion-2.0 as the model id. Requests go to https://api.aimlapi.com/v1/chat/completions.
Aion-2.0 is priced at input $1.10032 / 1M tokens, output $2.20064 / 1M tokens, cached input $0.27508 / 1M tokens.
Yes, Aion-2.0 can stream responses as they are generated.
Yes, Aion-2.0 accepts image input alongside text.
