Claude Sonnet 5.5 vs Muse Spark 1.2
Claude Sonnet 5.5 leads the LLM Stats Score 58.5 to 37.9. Muse Spark 1.2 is 2.0x cheaper per token.
Anthropic · Meta · Updated for 2026
Which is better?
Claude Sonnet 5.5 leads the overall LLM Stats Score 58.5 to 37.9, ranking #2 overall.
In the 1 individual benchmarks reported for both models, Claude Sonnet 5.5 wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, Muse Spark 1.2 is roughly 2.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Muse Spark 1.2 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 58.5 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 1 of 1 exact shared results
- you want the most recent training data — it shipped Sep 2026
Choose Muse Spark 1.2
- cost matters — it's about 2.0x cheaper per token
- you process long inputs — it offers a 1,048,576 token context window
At a glance
The differences that matter most.
Individual benchmarks
47 reported for Claude Sonnet 5.5 · 3 for Muse Spark 1.2
Claude Sonnet 5.5 outperforms in 1 benchmarks (DeepSWE 1.1), while Muse Spark 1.2 is better at 0 benchmarks.
Claude Sonnet 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 Sonnet 5.5 ($2.00/1M tokens) is 1.6x more expensive than Muse Spark 1.2 ($1.25/1M tokens).
For output processing, Claude Sonnet 5.5 ($10.00/1M tokens) is 2.4x more expensive than Muse Spark 1.2 ($4.25/1M tokens).
In conclusion, Claude Sonnet 5.5 is more expensive than Muse Spark 1.2.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Muse Spark 1.2 accepts 1,048,576 input tokens compared to Claude Sonnet 5.5's 1,000,000 tokens. Muse Spark 1.2 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 Muse Spark 1.2 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Sonnet 5.5
Muse Spark 1.2
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 Muse Spark 1.2 was released on 2026-08-05.
Claude Sonnet 5.5 is 2 months newer than Muse Spark 1.2.
Sep 28, 2026
1 weeks ago
1mo newerAug 5, 2026
2 months ago
Knowledge Cutoff
When training data ends
Claude Sonnet 5.5 has a documented knowledge cutoff of 2026-06-01, while Muse Spark 1.2'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 Muse Spark 1.2's cutoff date.
Jun 2026
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Provider Availability
Claude Sonnet 5.5 is available from Anthropic. Muse Spark 1.2 is available from Meta Model API.
Claude Sonnet 5.5
Muse Spark 1.2
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Sonnet 5.5 and Muse Spark 1.2 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Sonnet 5.5 vs Muse Spark 1.2.