Claude Opus 5.5 vs Laguna XS 2.1
Claude Opus 5.5 leads the LLM Stats Score 60.4 to 23.9. Laguna XS 2.1 is 64.0x cheaper per token.
Anthropic · Poolside · Updated for 2026
Which is better?
Claude Opus 5.5 leads the overall LLM Stats Score 60.4 to 23.9, ranking #1 overall.
In the 2 individual benchmarks reported for both models, Claude Opus 5.5 wins 2; this is a narrower head-to-head signal than the composite indexes.
On price, Laguna XS 2.1 is roughly 64.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude Opus 5.5 also accepts a larger context window (1,000,000 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 Opus 5.5
- overall performance matters — it scores 60.4 and ranks #1 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you value its reported benchmark strengths — it wins 2 of 2 exact shared results
- you process long inputs — it offers a 1,000,000 token context window
- you want the most recent training data — it shipped Sep 2026
Choose Laguna XS 2.1
- cost matters — it's about 64.0x cheaper per token
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Individual benchmarks
31 reported for Claude Opus 5.5 · 4 for Laguna XS 2.1
Claude Opus 5.5 outperforms in 2 benchmarks (SWE-bench Multilingual, SWE-Bench Pro), while Laguna XS 2.1 is better at 0 benchmarks.
Claude Opus 5.5 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Opus 5.5 ($4.00/1M tokens) is 40.0x more expensive than Laguna XS 2.1 ($0.10/1M tokens).
For output processing, Claude Opus 5.5 ($20.00/1M tokens) is 100.0x more expensive than Laguna XS 2.1 ($0.20/1M tokens).
In conclusion, Claude Opus 5.5 is more expensive than Laguna XS 2.1.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Claude Opus 5.5 accepts 1,000,000 input tokens compared to Laguna XS 2.1's 262,144 tokens. Only Claude Opus 5.5 specifies output context (128,000 tokens).
Input capabilities
Documented input modalities across available providers
Claude Opus 5.5 supports multimodal inputs, whereas Laguna XS 2.1 does not.
Claude Opus 5.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude Opus 5.5
Laguna XS 2.1
License
Usage and distribution terms
Claude Opus 5.5 is licensed under a proprietary license, while Laguna XS 2.1 uses OpenMDW License v1.1.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
OpenMDW License v1.1
Open weights
Release Timeline
When each model was launched
Claude Opus 5.5 was released on 2026-09-22, while Laguna XS 2.1 was released on 2026-07-02.
Claude Opus 5.5 is 3 months newer than Laguna XS 2.1.
Sep 22, 2026
4 weeks ago
2mo newerJul 2, 2026
3 months ago
Knowledge Cutoff
When training data ends
Claude Opus 5.5 has a documented knowledge cutoff of 2026-06-01, while Laguna XS 2.1's cutoff date is not specified.
We can confirm Claude Opus 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without Laguna XS 2.1's cutoff date.
Jun 2026
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Provider Availability
Claude Opus 5.5 is available from Anthropic. Laguna XS 2.1 is available from Poolside.
Claude Opus 5.5
Laguna XS 2.1
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Opus 5.5 and Laguna XS 2.1 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Opus 5.5 vs Laguna XS 2.1.