Claude Sonnet 5.5 vs Particle-1
Claude Sonnet 5.5 leads the LLM Stats Score 57.9 to 31.9. Particle-1 is 9.1x cheaper per token.
Anthropic · Particle AI · Updated for 2026
Which is better?
Claude Sonnet 5.5 leads the overall LLM Stats Score 57.9 to 31.9, ranking #3 overall.
On price, Particle-1 is roughly 9.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Particle-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 57.9 and ranks #3 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
Choose Particle-1
- cost matters — it's about 9.1x cheaper per token
- you process long inputs — it offers a 1,048,576 token context window
- you want the most recent training data — it shipped Oct 2026
At a glance
The differences that matter most.
Individual benchmarks
47 reported for Claude Sonnet 5.5 · 3 for Particle-1
Claude Sonnet 5.5 and Particle-1don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Sonnet 5.5 ($2.00/1M tokens) is 8.0x more expensive than Particle-1 ($0.25/1M tokens).
For output processing, Claude Sonnet 5.5 ($10.00/1M tokens) is 10.0x more expensive than Particle-1 ($1.00/1M tokens).
In conclusion, Claude Sonnet 5.5 is more expensive than Particle-1.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Particle-1 accepts 1,048,576 input tokens compared to Claude Sonnet 5.5's 1,000,000 tokens. Particle-1 can generate longer responses up to 131,072 tokens, while Claude Sonnet 5.5 is limited to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Claude Sonnet 5.5 and Particle-1 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Sonnet 5.5
Particle-1
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Claude Sonnet 5.5 was released on 2026-09-28, while Particle-1 was released on 2026-10-28.
Particle-1 is 1 month newer than Claude Sonnet 5.5.
Sep 28, 2026
3 weeks ago
Oct 28, 2026
-3 days ago
1mo newerKnowledge Cutoff
When training data ends
Claude Sonnet 5.5 has a documented knowledge cutoff of 2026-06-01, while Particle-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 Particle-1's cutoff date.
Jun 2026
—
Provider Availability
Claude Sonnet 5.5 is available from Anthropic. Particle-1 is available from Particle AI.
Claude Sonnet 5.5
Particle-1
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Sonnet 5.5 and Particle-1 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Sonnet 5.5 vs Particle-1.