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Specifications
Specifications and pricing as served by Composite
Model ID
particle-ai/particle-1-reasoning
Provider
cv11
Context window
1,048,576 tokens
Accepts
text, image
Returns
text
Input price
$0.0625 per million tokens
Output price
$0.625 per million tokens
Prompt caching
Supported — cached input is billed at the provider's cache rate, on credits and plans alike
Thinking
Optional - see "Particle AI: Particle-1 (Reasoning) (Reasoning)" in the catalog to turn it on by default
Moderated
No
Cost on a monthly plan
About 0.9 plan credits per typical call (8k in, 1k out)
Routing endpoints
1
Use Particle AI: Particle-1 (Reasoning) in JanitorAI or SillyTavern
Make a Composite API key and type particle-ai/particle-1-reasoning as the model name. JanitorAI takes the full URL https://composite.lucidity.sh/v1/chat/completions; SillyTavern, ChubAI, Agnai and RisuAI take https://composite.lucidity.sh/v1. It runs on credits, a plan, or your own provider key.
This model has not carried enough traffic on Composite yet to publish a success rate, a latency figure or a traffic rank. The numbers appear here once it has.
Pricing
$0.0625 per million tokens input · $0.625 per million tokens output
Credits pay the provider’s price plus 25%; cache hits cost less.
On a monthly plan, a typical call (8k tokens in, 1k out) uses about 0.9 plan credits, at the provider's own price.
Provider
cv11
Roleplay fit
This model is available on Composite alongside dozens of others from other labs, so it is easy to compare against similar options.
Context behavior
With a 1,048,576-token context window, it can hold a long-running roleplay or a full lorebook in memory without losing earlier plot details, so it suits multi-session campaigns and character cards with heavy backstory.
Cost for regular use
It is priced low enough for high-volume daily roleplay without the per-message cost adding up quickly.
From the provider
Particle-1 is a token-efficient agentic coding model from Particle AI, post-trained on DeepSeek V4.1 Flash. It is suited for software engineering work such as terminal workflows, codebase changes, and data...