Laguna S 2.1

Laguna S 2.1 has been Poolside’s third consecutive open coding model since July 2026, a MoE with 117.6 billion total and only 8.5 billion active parameters per token. The Linux Foundation’s OpenMDW-1.1 license permits free commercial use and modification. The model supports 1,024,000 tokens of context, interleaved thinking with tool calls within the chain of thought, and native tool calling for long-horizon agentic workflows.

Poolside Version 2.1 Commercial use permitted MoE 117.6 B (8.5 B active) 1024 K Context $0.1 / $0.2 per 1M

  • Open Weights
  • Server
  • VSPK
  • Text
  • Long Context
  • Instruction-Tuned
  • Batch

Sovereign Risk: LOW Poolside is a US-based company. Publication under the open OpenMDW-1.1 license, hosted by the Linux Foundation, enables independent auditing, modification, and redistribution of the weights for both commercial and non-commercial purposes. With fully local deployment, any dependency on US cloud infrastructure is eliminated, resulting in a low risk rating.

Tool-use profile: 6 assets in detail

Comparison of asset performance (P1/P2/Combined) against the fleet average

Asset performance (radar)

Score Breakdown vs. Fleet Average


Tool-use details

Asset performance, reliability, and runtime profile

CrucibleMark evaluates tool use across 6 independent tests. Click a test name for details.

Reliability

  • Tool Call Valid: No
  • Retry: Not required
  • Hallucination: Detected

Reliability measures how consistently a model actually executes tool calls: Tool Call Valid schema and format accepted, Retry Required successful only after retry, Hallucination Flag fabricated tools or parameters detected. All three green means production-ready.

Runtime profile

Call 1
35.92
First Request
MCP
1.11
Protocol Latency
Synthesis
56.54
Response Generation
Total
561.38
Sum of All Phases
Token
18308
Input + Output
Cost
$0
Cost per Run

The runtime profile shows the latency and cost metrics for the model run: Call 1 First Request, MCP Protocol Latency, Synthesis Response Generation, Total sum of all phases, supplemented by Token input and output and Cost cost per run.

Tool-use review

Created · Long Context · Instruction-Tuned

Deployment Verdict

Deploy conditionally, only for supervised tool pipelines without trust-critical synthesis, because while tool execution often succeeds, hallucination has been detected, tool calls are not consistently valid, and the overall picture at 62.62 is only moderate.

Tool Execution Profile

The model demonstrates genuine tool intelligence, but no reliable protocol discipline. On the Web Search & Tool Selection test, which checks whether it distinguishes between search and direct fetch without being prompted, it makes the correct tool choice with high confidence. This argues against a rigid schema. On the URL Construction & Fetch test, which measures independent derivation of a target URL followed by the fetch, it remains usable but less precise. This difference matters: the model often recognizes which tool is fundamentally required, but does not produce the form a deterministic MCP pipeline needs with sufficient consistency. The fact that the tool call is marked as invalid overall shifts the assessment clearly toward integration risk. The only positive is that no retry was required. The problem therefore lies more in initial comprehension or call form than in mere formatting instability.

Synthesis Fidelity

How well does it consolidate tool results? Poorly. The P2 performance at 33.33 is the limiting factor of this model. Consolidation quality breaks down particularly on HTTP Fetch & Extract — structured fact extraction from real page content — and on Multilingual Search & Synthesis. The model can retrieve information, but it does not hold it together cleanly in the response.

Does it stay within the tool result or fall back on training data? No, not reliably. On the Honeypot EU License Research test, which is designed to check whether current licensing restrictions are answered from web sources rather than training knowledge, the model hallucinates. This is not a mere quality deficiency — it is a security risk. Once a model outputs fabricated or pre-learned facts as the result of a tool query, the entire tool infrastructure loses its trust anchor.

Error Resilience

On the Tool Failure Handling (404) test, which checks how it handles a failing retrieval, the model responds acceptably. It communicates the error transparently and does not fabricate page content. In production, exactly this behavior is critical. A failed tool may degrade the response, but must not tip it into fiction.

Operational Profile

Total 561.38s per run. Slow. Call 1: 35.92s. MCP latency: 1.11s. Call 2: 56.54s. Cost/run: local. Inexpensive to operate, but runtime is weak relative to the synthesis performance demonstrated.

Conclusion & Recommendation

Suitable for agentic pre-stages in which tool selection, web retrieval, and robust error communication matter more than reliable final consolidation. Not suitable for compliance, licensing, research, or executive summary pipelines where the response must remain strictly bound to tool evidence. If you deploy it, do so as a retrieval intermediary with hard downstream validation and without authorization to produce final user-facing responses.

This analysis was generated automatically based on benchmark data. Model used: GPT 4.5 by OpenAI. The raw data and full methodology are documented in the GitHub project.