What is Particle-1 (free)?

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 engineering tasks, and is trained to complete them with substantially fewer reasoning and tool-call tokens while keeping accuracy close to its base model.

Is Particle-1 (free) free?

Yes. The pricing shown on this page for Particle-1 (free) is zero, so you are not charged for prompt or completion tokens. Free endpoints are rate limited — see the rate limit docs.

What is the context length of Particle-1 (free)?

Particle-1 (free) has a 1,048,576 token context window. It supports up to 131,072 completion tokens.

Does Particle-1 (free) support tool calling and structured outputs?

Yes. Particle-1 (free) accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

What inputs and outputs does Particle-1 (free) support?

Particle-1 (free) accepts text and images as input and returns text.

Which providers serve Particle-1 (free)?

Particle-1 (free) is served by 1 provider on OpenRouter: Particle AI.

When was Particle-1 (free) released?

Particle-1 (free) was released on October 28, 2026.

Particle-1 (free) - API Pricing & Providers

Providers

This model is hosted by one provider. OpenRouter forwards every request without routing.

Latency / throughput


	Free	Free	1.19s	121 tok/s	100.00%

Input FreeOutput Free
121 tok/s100.00% uptime

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Throughput

121tok/s

P50, best across providers

Latency

1.19s

P50, best provider

Reasoning effort

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Uptime (3d)

99.99%

Availability (3d)

99.83%

Availability over the last 3 days

Last 72 hours

Availability 99.83%

3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability

99.89%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and provider routing options.

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

1.

Kilo Code

Kilo Code is an open-source AI coding agent that works across VS Code, JetBrains, and CLI to help developers ship code faster with agentic workflows.

100Btokens

2.

Hermes Agent

Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents.

3.53Btokens

3.

pi

There are many coding agents, but this one is yours.

2.64Btokens

4.

DeepSeek Harness

new

1.58Btokens

5.

Claude Code

Claude Code is Anthropic's agentic coding tool that reads your entire codebase, plans and executes changes across files, runs tests, and iterates on failures, all from natural language prompts.

1.54Btokens

Top 5 Apps

60.6B

Rest of OpenRouter

20B

Activity

Token volume and request traffic to this model over time.

API

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

Particle AI: Particle-1 (free)