Particle-1

particle-ai/particle-1 is Particle AI's agentic coding model, post-trained on DeepSeek V4.1 Flash to spend fewer tokens on terminal workflows, codebase changes and data work. It has a 1,048,576-token context window and a 131,072-token maximum output, takes text and image input, and answers in text, with reasoning, streaming and tool calling. OpenRouter lists it at $0.25 per million input tokens and $1 per million output tokens.

import { createAnyRouter } from "@anyr/ai-sdk-provider"
import { generateText } from "ai"

const anyrouter = createAnyRouter()
const { text } = await generateText({
  model: anyrouter("particle-ai/particle-1"),
  prompt: "Find the failing test in this repo and fix it.",
})
console.log(text)

curl -fsSL https://anyrouter.dev/setup.sh | bash
anyr login
anyr claude --model "particle-ai/particle-1"

Particle-1 is BYOK-only. Add an OpenRouter key under Dashboard → BYOK; AnyRouter charges nothing for a BYOK route and OpenRouter bills you at its own rate.

Playbooks: AI SDK, OpenAI SDK, coding agents, playground.