# ARC 1.0 decision model by Rayline

> ARC 1.0 predicts model success and token use for agent routing. Read its open weights, policy presets and unfinished public serving plugin.

Updated 2026-11-12 (Australia/Adelaide)

## Quick answers

### What is ARC 1.0 by Rayline?

[ARC 1.0](<https://decisionmodels.ai/models/arc>): A Qwen3.5-0.8B-derived router that predicts model success and token use separately from the prices supplied by an application.

[ARC 1.0 facts](<https://decisionmodels.ai/models/arc>)

[Source](<https://huggingface.co/rayline-ai/ARC-1.0>)

### Who makes ARC 1.0?

[ARC 1.0](<https://decisionmodels.ai/models/arc>): Rayline

[ARC 1.0 facts](<https://decisionmodels.ai/models/arc>)

[Source](<https://huggingface.co/rayline-ai/ARC-1.0>)

### Are ARC 1.0's weights open?

[ARC 1.0](<https://decisionmodels.ai/models/arc>): Open weights and hosted arc-sage-1.0 / arc-swift-1.0; public vllm-arc plugin is unfinished Licence: Apache-2.0; LICENSE and NOTICE included

[ARC 1.0 facts](<https://decisionmodels.ai/models/arc>)

[Source](<https://huggingface.co/rayline-ai/ARC-1.0>)

By Rayline · Hugging Face weight release: 2026-11-10 · OPEN

A Qwen3.5-0.8B-derived router that predicts model success and token use separately from the prices supplied by an application. The package includes routing and content-signal heads plus a general question head. Sage and Swift are policies on the same model.

## Facts

- Base: Qwen/Qwen3.5-0.8B; specialized heads use the lower 12 layers, while the question head uses all 24
- Inputs: Agent conversation and developer-defined questions with answer options
- Access: Open weights and hosted arc-sage-1.0 / arc-swift-1.0; public vllm-arc plugin is unfinished
- Serving: Stock vLLM cannot load the architecture alone. The public plugin supports encoder integration and Stage-1 scoring, without the complete policy, question or content-signal APIs
- Licence: Apache-2.0; LICENSE and NOTICE included

## Claims and sources

- **VENDOR-REPORTED**: The maker defines utility as value of success times predicted success minus expected cost. Sage uses value 4.5 and Swift 0.1. Prices are supplied at runtime; the package contains no price snapshot. [source](<https://huggingface.co/rayline-ai/ARC-1.0>)

## Links

- [Source: Card and release files](<https://huggingface.co/rayline-ai/ARC-1.0>)
- [Source: Policies](<https://huggingface.co/rayline-ai/ARC-1.0/blob/main/presets.json>)
- [Source: Provenance](<https://huggingface.co/rayline-ai/ARC-1.0/blob/main/provenance.json>)
- [Source: Licence](<https://huggingface.co/rayline-ai/ARC-1.0/blob/main/LICENSE>)
- [Source: Public plugin and limits](<https://github.com/rayline-ai/vllm-arc>)

## Related projects

No related projects are listed in the registry.