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Claude Sonnet 5.5 vs Laguna S 2.1

Claude Sonnet 5.5 leads the LLM Stats Score 58.4 to 39.7. Laguna S 2.1 is 32.0x cheaper per token.

Anthropic · Poolside · Updated for 2026

Which is better?

Claude Sonnet 5.5 leads the overall LLM Stats Score 58.4 to 39.7, ranking #2 overall.

In the 3 individual benchmarks reported for both models, Claude Sonnet 5.5 wins 3; this is a narrower head-to-head signal than the composite indexes.

On price, Laguna S 2.1 is roughly 32.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Laguna S 2.1 also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Sonnet 5.5

  • overall performance matters — it scores 58.4 and ranks #2 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 3 of 3 exact shared results
  • you want the most recent training data — it shipped Sep 2026

Choose Laguna S 2.1

  • cost matters — it's about 32.0x cheaper per token
  • you process long inputs — it offers a 1,048,576 token context window
  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Claude Sonnet 5.5
Anthropic
Laguna S 2.1
Poolside
Core performance indexes
LLM Stats Score
58.4
#2
39.7
#73
Reasoning
57.2
#3
39.7
#71
Coding
47.6
#2
29.1
#69
Agents
43.3
#3
23.3
#75
Cost, coverage & limits
Benchmark wins
3 of 3
0 of 3
Input price
$2.00 / M
$0.10 / M
Output price
$10.00 / M
$0.20 / M
Context window
1,000,000
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Claude Sonnet 5.5
Laguna S 2.1
Tool use
35.8#2
15.3#106
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

47 reported for Claude Sonnet 5.5 · 6 for Laguna S 2.1

3 shared

Claude Sonnet 5.5 outperforms in 3 benchmarks (DeepSWE 1.1, SWE-bench Multilingual, SWE-Bench Pro), while Laguna S 2.1 is better at 0 benchmarks.

Claude Sonnet 5.5 significantly outperforms across most benchmarks.

Thu Oct 22 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Laguna S 2.1 costs less

For input processing, Claude Sonnet 5.5 ($2.00/1M tokens) is 20.0x more expensive than Laguna S 2.1 ($0.10/1M tokens).

For output processing, Claude Sonnet 5.5 ($10.00/1M tokens) is 50.0x more expensive than Laguna S 2.1 ($0.20/1M tokens).

In conclusion, Claude Sonnet 5.5 is more expensive than Laguna S 2.1.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Thu Oct 22 2026 • llm-stats.com
Anthropic
Claude Sonnet 5.5
Input tokens$2.00
Output tokens$10.00
Best providerAnthropic
Poolside
Laguna S 2.1
Input tokens$0.10
Output tokens$0.20
Best providerPoolside
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

Laguna S 2.1 accepts 1,048,576 input tokens compared to Claude Sonnet 5.5's 1,000,000 tokens. Only Claude Sonnet 5.5 specifies output context (128,000 tokens).

Anthropic
Claude Sonnet 5.5
Input1,000,000 tokens
Output128,000 tokens
Poolside
Laguna S 2.1
Input1,048,576 tokens
Output- tokens
Thu Oct 22 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Sonnet 5.5 supports multimodal inputs, whereas Laguna S 2.1 does not.

Claude Sonnet 5.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Sonnet 5.5

Text
Images
Audio
Video

Laguna S 2.1

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Sonnet 5.5 is licensed under a proprietary license, while Laguna S 2.1 uses OpenMDW License v1.1.

License differences may affect how you can use these models in commercial or open-source projects.

Claude Sonnet 5.5

Proprietary

Closed source

Laguna S 2.1

OpenMDW License v1.1

Open weights

Release Timeline

When each model was launched

Claude Sonnet 5.5 was released on 2026-09-28, while Laguna S 2.1 was released on 2026-07-21.

Claude Sonnet 5.5 is 2 months newer than Laguna S 2.1.

Claude Sonnet 5.5

Sep 28, 2026

3 weeks ago

2mo newer
Laguna S 2.1

Jul 21, 2026

3 months ago

Knowledge Cutoff

When training data ends

Claude Sonnet 5.5 has a documented knowledge cutoff of 2026-06-01, while Laguna S 2.1's cutoff date is not specified.

We can confirm Claude Sonnet 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without Laguna S 2.1's cutoff date.

Claude Sonnet 5.5

Jun 2026

Laguna S 2.1

—

Provider Availability

Claude Sonnet 5.5 is available from Anthropic. Laguna S 2.1 is available from Poolside.

Claude Sonnet 5.5

anthropic logo
Anthropic
Input Price:Input: $2.00/1MOutput Price:Output: $10.00/1M

Laguna S 2.1

poolside logo
Poolside
Input Price:Input: $0.10/1MOutput Price:Output: $0.20/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Claude Sonnet 5.5 and Laguna S 2.1 side-by-side, then vote on the output you prefer.

Claude Sonnet 5.5
✓ Preferred
Laguna S 2.1
Open in Playground

FAQ

Common questions about Claude Sonnet 5.5 vs Laguna S 2.1.

Which is better, Claude Sonnet 5.5 or Laguna S 2.1?

Claude Sonnet 5.5 leads the LLM Stats Score 58.4 to 39.7. Claude Sonnet 5.5 is made by Anthropic and Laguna S 2.1 is made by Poolside. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Sonnet 5.5 compare to Laguna S 2.1 in benchmarks?

Claude Sonnet 5.5 scores BenchCAD (with Python tool): 96.3%, ArXivMath (with tools): 95.2%, Global-MMLU: 92.1%, MILU: 91.6%, SWE-bench Multilingual: 90.3%. Laguna S 2.1 scores SWE-bench Multilingual: 78.5%, Terminal-Bench 2.1: 70.2%, SWE-Bench Pro: 59.4%, Toolathlon: 49.7%, SWE Atlas - Codebase QnA: 46.2%.

Is Claude Sonnet 5.5 cheaper than Laguna S 2.1?

Laguna S 2.1 is 20.0x cheaper for input tokens. Claude Sonnet 5.5 costs $2.00/M input and $10.00/M output via anthropic. Laguna S 2.1 costs $0.10/M input and $0.20/M output via poolside.

What are the context window sizes for Claude Sonnet 5.5 and Laguna S 2.1?

Claude Sonnet 5.5 supports 1.0M tokens and Laguna S 2.1 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Sonnet 5.5 and Laguna S 2.1?

Key differences include LLM Stats Score (58.4 vs 39.7), context window (1.0M vs 1.0M), input pricing ($2.00 vs $0.10/M), multimodal support (yes vs no), licensing (Proprietary vs OpenMDW License v1.1). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Sonnet 5.5 and Laguna S 2.1?

Claude Sonnet 5.5 is developed by Anthropic and Laguna S 2.1 is developed by Poolside.

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