Overview
Laguna S 2.1 is the latest coding agent model from [Poolside](<https://poolside.ai/>). Laguna S 2.1 is a 118B total parameter model with 8B active parameters, scoring 70.2% on Terminal-Bench 2.1 and...
Our take
Developers and researchers looking for a free, capable coding agent may find Poolside: Laguna S 2.1 a suitable option. Unlike general-purpose AI chatbots such as Claude or ChatGPT, this model from Poolside focuses on coding-specific tasks, offering a 262,144-token context window that facilitates working with larger codebases or complex documentation. Its built-in reasoning (chain-of-thought) mode is designed to tackle more challenging problems, and support for tool/function calling enables agent-style workflows, which could be beneficial for automating development processes or integrating with existing systems. For instance, a software engineer might use it to generate and refine code snippets based on extensive project specifications, leveraging its context window to maintain an understanding of the entire codebase. However, as it is text-only, users requiring image input will need to look elsewhere. Ideal for those who need a free, dedicated coding assistant with strong contextual understanding and agent capabilities, but not for multimedia tasks.
How Poolside: Laguna S 2.1 stacks up
Among the 359 chatbots & llms tools in our directory, it ranks #70 of 354 on quality (8.9/10), 12% above the 354-tool average of 8.0, and its $0.09/1M input-token rate is in the budget end — 96% cheaper than the 344-model average of $2.02/1M.
Weighing quality against cost, Poolside: Laguna S 2.1's cost-per-quality-point of $0.01 places it in the top 10% for value among chatbots & llms tools.
Poolside: Laguna S 2.1 in depth
Poolside: Laguna S 2.1, built by Poolside, sits in the chatbots & llms space and is free to start, with paid plans from $0.09/1M tokens. Our editors rate it 8.9 out of 10 based on capability, ecosystem and value. It handles a context window of 1,048,576 tokens.
On the feature side, Poolside: Laguna S 2.1 brings 1,048,576-token context window, reasoning / chain-of-thought and tool / function calling. These are the capabilities that most shape day-to-day use and separate it from thinner alternatives.
Its biggest strength is completely free to use via the openrouter api, while the main trade-off to weigh is that text-only: does not accept image input. Keep both in mind when deciding whether it fits your workflow.
Poolside: Laguna S 2.1 is most often chosen for research and writing. If that matches your goals, it's a strong candidate to shortlist.
Key features
- ✓1,048,576-token context window
- ✓Reasoning / chain-of-thought
- ✓Tool / function calling
Pricing
Pros
- +Completely free to use via the OpenRouter API
- +Large 1,048,576-token context window, bigger than most models listed here
- +Built-in reasoning (chain-of-thought) mode for harder problems
- +Supports tool / function calling for agent-style workflows
Cons
- −Text-only: does not accept image input
Who should use Poolside: Laguna S 2.1
- →Anyone looking for a chatbots & llms tool from Poolside.
- →Teams and individuals focused on research and writing.
- →Users who want to try before they buy — there's a free tier.
- →People who value completely free to use via the openrouter api.
Who should look elsewhere
- →Those for whom text-only: does not accept image input is a dealbreaker.
Best for
10 Best Poolside: Laguna S 2.1 Alternatives in 2026
Poolside: Laguna S 2.1 is a strong chatbots & llms tool, but it is not the only option. Whether you are after a lower price, different features or a better fit for your workflow, here are the 10 best alternatives to Poolside: Laguna S 2.1, ranked and compared.
Anthropic
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OpenAI
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Google DeepMind
Gemini is Google's natively multimodal model family, deeply integrated across Search, Workspace, Android and the Pixel…
Z.AI
GLM-5.3-FlashX is the high-speed variant of Z.ai's GLM-5.3-Flash, a native multimodal model delivering inference speeds…
Sakana AI
Fugu Ultra v2 is the higher-performance model in Sakana AI's Fugu family.
Sakana AI
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DeepSeek
DeepSeek V4.1 Flash is a sparse mixture-of-experts model from DeepSeek, and the first built on the company's Causal…
OpenAI
GPT-6 Astra is OpenAI's flagship model for demanding end-to-end work. It is suited for advanced analysis, software…
OpenAI
GPT-6 Astra Pro is the same underlying model as [GPT-6 Astra](https://openrouter.ai/openai/gpt-6-astra), served with…
Qwen
Qwen3.8 Max 0902 is an updated snapshot of Qwen3.8 Max from Alibaba's Qwen team.
Poolside: Laguna S 2.1 vs top alternatives
A side-by-side look at how Poolside: Laguna S 2.1 stacks up against its closest rivals.
| Feature | Poolside: Laguna S 2.1Poolside | ClaudeAnthropic | ChatGPTOpenAI | GeminiGoogle DeepMind |
|---|---|---|---|---|
| Quality score | 8.9 / 10 | 9.6 / 10 | 9.5 / 10 | 9.2 / 10 |
| Starting price | $0.09/1M tokens | $20/mo | $20/mo | $20/mo |
| Free tier | Yes — Free variant available | Yes — Free tier available | Yes — Free tier available | Yes — Free tier available |
| API input price | $0.09 / 1M tokens | $10 / 1M tokens | $10 / 1M tokens | $0.75 / 1M tokens |
| API output price | $0.18 / 1M tokens | $50 / 1M tokens | $50 / 1M tokens | $3.75 / 1M tokens |
| Speed | — | Fast | Fast | Fast |
| Context window | 1,048,576 tokens | 200K tokens | 128K tokens | 1M-2M tokens |
| Categories | Chatbots & LLMs | Chatbots & LLMs, Coding, Writing | Chatbots & LLMs, Coding, Writing | Chatbots & LLMs, Coding, Writing |
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Frequently asked questions
Q. Is Poolside: Laguna S 2.1 free?
Yes — Poolside: Laguna S 2.1 offers a free tier. Paid plans start at $0.09/1M tokens.
Q. How much does Poolside: Laguna S 2.1 cost?
Poolside: Laguna S 2.1 starts at $0.09/1M tokens. API usage is around $0.09 per 1M input tokens and $0.18 per 1M output tokens.
Q. What is Poolside: Laguna S 2.1 best for?
Poolside: Laguna S 2.1 is best suited to research and writing, within the chatbots & llms category.
Q. What are the best Poolside: Laguna S 2.1 alternatives?
Popular alternatives to Poolside: Laguna S 2.1 include Claude, ChatGPT, Gemini and Z.ai: GLM 5.3 FlashX. Each trades off price, quality and ecosystem differently.
Q. Is there a free alternative to Poolside: Laguna S 2.1?
Yes. Claude, ChatGPT, Gemini offer a free tier, making them good starting points if you want to avoid an upfront subscription.
Q. Why switch from Poolside: Laguna S 2.1?
Common reasons include pricing, specific feature gaps (Text-only: does not accept image input), data-privacy requirements, or simply wanting a tool that fits your stack better.
How we rate AI tools
Our quality score weighs capability on real tasks, breadth of features and integrations, pricing and value, and how actively the tool is maintained. Scores are editorial guidance, not benchmarks — always trial a tool on your own workflow before committing. Pricing and features change frequently, so verify current details on the official site.
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