Claude Opus 5.5 vs Muse Spark 1.2
Claude Opus 5.5 leads the LLM Stats Score 60.5 to 37.9. Muse Spark 1.2 is 4.0x cheaper per token.
Anthropic · Meta · Updated for 2026
Which is better?
Claude Opus 5.5 leads the overall LLM Stats Score 60.5 to 37.9, ranking #1 overall.
In the 1 individual benchmarks reported for both models, Claude Opus 5.5 wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, Muse Spark 1.2 is roughly 4.0x 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 Opus 5.5
- overall performance matters — it scores 60.5 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 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 4.0x 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
31 reported for Claude Opus 5.5 · 3 for Muse Spark 1.2
Claude Opus 5.5 outperforms in 1 benchmarks (DeepSWE 1.1), while Muse Spark 1.2 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 3.2x more expensive than Muse Spark 1.2 ($1.25/1M tokens).
For output processing, Claude Opus 5.5 ($20.00/1M tokens) is 4.7x more expensive than Muse Spark 1.2 ($4.25/1M tokens).
In conclusion, Claude Opus 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 Opus 5.5's 1,000,000 tokens. Muse Spark 1.2 can generate longer responses up to 131,072 tokens, while Claude Opus 5.5 is limited to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Claude Opus 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 Opus 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 Opus 5.5 was released on 2026-09-22, while Muse Spark 1.2 was released on 2026-08-05.
Claude Opus 5.5 is 2 months newer than Muse Spark 1.2.
Sep 22, 2026
2 weeks ago
1mo newerAug 5, 2026
2 months ago
Knowledge Cutoff
When training data ends
Claude Opus 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 Opus 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 Opus 5.5 is available from Anthropic. Muse Spark 1.2 is available from Meta Model API.
Claude Opus 5.5
Muse Spark 1.2
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Opus 5.5 and Muse Spark 1.2 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Opus 5.5 vs Muse Spark 1.2.