Poolside: Laguna XS.2 (free) – API Quickstart | OpenRouter

Poolside: Laguna XS.2 (free)

poolside/laguna-xs.2:free

Released Apr 28, 2026131,072 context$0/M input tokens$0/M output tokens

Laguna XS.2 is the second-generation model in the XS size class from Poolside(opens in new tab), their efficient coding agent series. It combines tool calling and reasoning capabilities with a compact footprint, offering a 128K context window and up to 8K output tokens. Quantized to fp8 for fast, cost-efficient agentic coding workflows.

Laguna XS.2 is designed for software engineering and agentic coding use cases, and you are responsible for confirming that it is appropriate for your intended application. Laguna XS.2 is subject to the Apache 2.0 License(opens in new tab), and should be used consistently with Poolside’s Acceptable Use Policy(opens in new tab). We advise against circumventing Laguna XS.2 safety guardrails without implementing substantially equivalent mitigations appropriate for your use case.

Please report security vulnerabilities or safety concerns to [email protected]

Sample code and API for Laguna XS.2 (free)

OpenRouter normalizes requests and responses across providers for you.

OpenRouter supports reasoning-enabled models that can show their step-by-step thinking process. Use the reasoning parameter in your request to enable reasoning, and access the reasoning_details array in the response to see the model's internal reasoning before the final answer. When continuing a conversation, preserve the complete reasoning_details when passing messages back to the model so it can continue reasoning from where it left off. Learn more about reasoning tokens.

In the examples below, the OpenRouter-specific headers are optional. Setting them allows your app to appear on the OpenRouter leaderboards.

Using third-party SDKs

For information about using third-party SDKs and frameworks with OpenRouter, please see our frameworks documentation.

See the Request docs for all possible fields, and Parameters for explanations of specific sampling parameters.