Claude Sonnet 5.5 vs Muse Spark 1.3
Too close to call. On the work we tested, Claude Sonnet 5.5 and Muse Spark 1.3 can't be told apart. Muse Spark 1.3 is the cheaper one, by 2.1×.
GrindBench-PubSec
BClaude Sonnet 5.5Anthropic70% 64–75%3.5¢ a task · 300 tasksBMuse Spark 1.3Meta64% 59–70%1.7¢ a task · 300 tasks
Too close to call here: their ranges overlap, so on another set of tasks the order could flip.
| Kind of work | Claude Sonnet 5.5 | Muse Spark 1.3 |
|---|---|---|
| ATIP redaction | 25% | 25% |
| Procurement evaluation | 90% | 78% |
| Performance analysis | 72% | 61% |
| Bilingual equivalence | 85% | 93% |
GrindBench-Banking
AClaude Sonnet 5.5Anthropic80% 70–90%$0.14 a task · 60 tasksBMuse Spark 1.3Meta63% 52–75%6.6¢ a task · 60 tasks
Too close to call here: their ranges overlap, so on another set of tasks the order could flip.
| Kind of work | Claude Sonnet 5.5 | Muse Spark 1.3 |
|---|---|---|
| Lending & mortgages | 80% | 60% |
| AML & KYC | 80% | 70% |
| Deposits & payments | 60% | 40% |
| Complaints & conduct | 90% | 80% |
| Credit risk | 80% | 70% |
| Capital & liquidity | 90% | 60% |
Each kind of work here rests on 10 tasks per model, so a single row can easily be 20 points off. A lead of 10 points or more is in bold; read it as a hint, not a result.