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Poolside AI released Laguna S 2.1, an open-weight 118B-A8B Mixture-of-Experts…

2026-07-21 · 20:47 UTC ·@alexatallah ·0 min read

Brief

Laguna S 2.1 from Poolside AI is an open-weight 118B-A8B MoE model optimized for coding agents and long-horizon workflows, offering a 1,048,576-token context window and up to 131,072-token outputs. It posts 70.2% on Terminal-Bench 2.1 and 40.4% on DeepSWE, is live on OpenRouter (free trial), and is priced at $0.10/million input and $0.20/million output tokens.

Why it matters

Poolside AI released Laguna S 2.1, an open-weight 118B-A8B Mixture-of-Experts (MoE) model targeted at agentic coding and long-horizon tasks.

Key details

  • Model specs: 1,048,576 (1M) token context window, 131,072 token max output; benchmark scores 70.2% on Terminal-Bench 2.1 and 40.4% on DeepSWE.
  • Available on OpenRouter (free trial), with API pricing listed at $0.10 per million input tokens and $0.20 per million output tokens.
Source evidence

New American open-weight model from @poolsideai: Laguna S 2.1

Try it for free on OpenRouter! 🎁

OpenRouter (@OpenRouter)

Laguna S 2.1 from @poolsideai is live on OpenRouter!

An open-weight 118B-A8B MoE for agentic coding and long-horizon work, with a 1M context window. Scores: 70.2% on Terminal-Bench 2.1 and 40.4% on DeepSWE.

Try it:
openrouter.ai/poolside/lagun…

Link

Laguna S 2.1 - API Pricing & Providers

Laguna S 2.1 is the latest coding agent model from Poolside. $0.10 per million input tokens, $0.20 per million output tokens. 1,048,576 token context window, maximum output of 131,072 tokens.
openrouter.ai

— https://nitter.net/OpenRouter/status/2079632445411106970#m