Free (rate-limited)
Particle-1 is free on OpenRouter and Kilo Code
Particle-1 is free for a limited time on OpenRouter and Kilo Code, with about 1 million tokens of context
Particle AI’s Particle-1 now has free routes on OpenRouter and Kilo Code, with no charge for input or output. It is a coding-agent model post-trained on DeepSeek V4.1 Flash, with about 1 million tokens of context. The OpenRouter free endpoint is rate-limited, and no end date has been announced. The official API is pay-per-use at $0.25 per million input tokens and $1.00 per million output tokens.
- Eligibility
- An OpenRouter or Kilo Code account can call the matching free route. The free routes are rate-limited, and prompts and outputs may be used to improve the model.
- Benefit duration
- Free for a limited time; no end date has been announced
The briefing
Particle AI’s Particle-1 now has free routes on OpenRouter and Kilo Code, with no charge for input or output. It is a token-efficient coding-agent model post-trained on DeepSeek V4.1 Flash, suited to terminal work, codebase changes, and data-engineering tasks. It is trained to use fewer reasoning and tool-call tokens while staying close to the accuracy of its base model.
What you get
The model ID on both OpenRouter and Kilo Code is particle-ai/particle-1:free. It has about 1 million tokens of context, a completion cap of about 131,000 tokens, and support for tool use. The OpenRouter free endpoint allows up to 20 requests per minute. Accounts that have purchased fewer than 10 credits get up to 50 requests per day; after at least 10 credits have been purchased, the daily cap rises to 1,000.
No end date has been announced. Prompts and outputs on the free routes may be used to improve the model. This is not an official credit grant: Particle’s own API is pay-per-use at $0.25 per million input tokens and $1.00 per million output tokens.
How to use it
- Create an OpenRouter API key, set the Base URL to
https://openrouter.ai/api/v1, and use the model nameparticle-ai/particle-1:free. - In Kilo Code, select the model
particle-ai/particle-1:free.
See the OpenRouter model page, the OpenRouter free-endpoint limits, and the Particle model docs.
