Poolside releases open-weight Laguna S 2.1 coding model

// 2h agoMODEL RELEASE

Poolside releases open-weight Laguna S 2.1 coding model

Poolside has launched Laguna S 2.1 on OpenRouter, bringing an open-weight 118B total / 8B active parameter Mixture-of-Experts model with a 1-million-token context window to developers. Built specifically for agentic coding, it achieves 70.2% on Terminal-Bench 2.1 and 40.4% on DeepSWE, accessible via OpenRouter API including a free tier.

// ANALYSIS

Poolside continues to push the boundaries of open-weight coding models by delivering frontier-class agentic capabilities in a compute-efficient MoE architecture.

• Massive 1M Context Window: Allows agents to maintain complete context over complex, multi-file codebases and extended execution histories.

• Parameter Efficiency: Activating only 8B out of 118B total parameters ensures fast inference speeds while retaining model capacity.

• Strong Benchmark Performance: High scores on Terminal-Bench 2.1 (70.2%) and DeepSWE (40.4%) underscore its practical strength in terminal interaction and software engineering workflows.

• Broad Accessibility: Available open-weight for self-hosting alongside instant API access via OpenRouter.

// TAGS

aillmmoecoding-agentopen-weightspoolsideopenrouterbenchmarksai-codingagent

DISCOVERED

2h ago

2026-07-21

PUBLISHED

3h ago

2026-07-21

RELEVANCE

9/ 10

AUTHOR

OpenRouter

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