particle-1-free
Particle-1 (free) is a token-efficient agentic coding model from Particle AI, post-trained on DeepSeek V4.1 Flash, for terminal workflows, codebase changes and data work. This is the free tier served through OpenRouter: requests are rate-limited, the free version may be withdrawn at any time, and free providers may log prompts — use the paid version for production.
Precio: Entrada: 0 créditos / 1 M de tokens (≈ $0.00); salida: 0 créditos / 1 M de tokens (≈ $0.00).
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Particle-1 (free) is a token-efficient agentic coding model from Particle AI, post-trained on DeepSeek V4.1 Flash, for terminal workflows, codebase changes and data work. This is the free tier served through OpenRouter: requests are rate-limited, the free version may be withdrawn at any time, and free providers may log prompts — use the paid version for production.
Particle-1 (free) at a glance
Particle-1 (free) is a chat model from Particle AI. It accepts text and images as input and returns text, with a context window of up to 1M tokens.
Use it without hosting anything
The same key also works for the other chat, image, video and audio models on ModelFold.
Core Capabilities of Particle-1 (free)
Up to 1M tokens of context
Keep long conversations, large documents and sizeable code in a single request, so the model can reason over the full material instead of fragments.
Understands images
Besides text, Particle-1 (free) accepts images as input, so a single request can combine instructions with visual or other media.
Function calling
Particle-1 (free) supports tool (function) calling: describe your functions in the request and the model returns structured calls your code can run — the basis for agents and integrations.
Adjustable reasoning effort
Choose a reasoning effort level (low, medium or high) per request to balance depth of thinking against speed and token usage.
Structured outputs
Ask for JSON that follows a schema (response_format), which makes extraction, classification and system integrations more reliable.
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Step 1: Try it in the Playground
Open the Playground at the top of this page, type a prompt and see how Particle-1 (free) responds before writing any code.
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Step 2: Create an API key
Sign in to ModelFold and create an API key in the console. Keep it secret and send it as a Bearer token.
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Step 3: Send a request
Call POST https://modelfold.ai/v1/chat/completions with "model": "particle-1-free" and your messages. Existing OpenAI-compatible SDKs work by changing the base URL and key.
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Step 4: Ship and monitor
Integrate the response into your product and check token usage and spend for every call in the console logs.
AI coding assistants
Generate, explain, debug and refactor code, review pull requests and work through multi-file changes in developer tools and IDE plugins.
Autonomous agents
Build agents that plan multi-step tasks, call your tools and APIs, and keep working toward a goal across long sessions.
High-volume pipelines
Run classification, extraction, rewriting and batch jobs at scale where cost per request matters.
Frequently Asked Questions
What is Particle-1 (free)?⌄
Particle-1 (free) is a token-efficient agentic coding model from Particle AI, post-trained on DeepSeek V4.1 Flash, for terminal workflows, codebase changes and data work. This is the free tier served through OpenRouter: requests are rate-limited, the free version may be withdrawn at any time, and free providers may log prompts — use the paid version for production.
Which inputs does Particle-1 (free) support?⌄
Particle-1 (free) accepts text and images and returns text. Through ModelFold you can send text and images (OpenAI-style image_url content); in the Playground you can also attach documents, which are converted to text.
How long is the context window of Particle-1 (free)?⌄
Up to 1M tokens, shared between your input and the model’s output.
Does Particle-1 (free) support function calling?⌄
Yes. Particle-1 (free) supports tools / function calling through the standard tools parameter of the chat completions API.
How is Particle-1 (free) billed on ModelFold?⌄
This is the free version served through OpenRouter: calls are not charged, but they are rate-limited and the free version may be withdrawn at any time. Use the paid version of the model for production traffic.
| Entrada | 0 créditos 1M tokens≈ $0.00 |
| Salida | 0 créditos 1M tokens≈ $0.00 |
Se cobra por token, con tarifas separadas para entrada y salida. Los tokens de razonamiento cuentan como salida. El entorno de pruebas aplica exactamente el mismo cálculo.
Leer la documentación de la API →AI Agents · Claude Code / Cursor / Trae →curl https://modelfold.ai/v1/chat/completions \
-H "Authorization: Bearer $MODELFOLD_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"particle-1-free","messages":[{"role":"user","content":"Hello"}]}'