Muse Spark 1.3 vs Step 3.5 Flash
As of Oct 14, 2026, Muse Spark 1.3 leads Step 3.5 Flash in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
Muse Spark 1.3
Yes. Yes on Coding › Web dev (best per dollar); Vision (best per dollar). Not the overall leader.
Step 3.5 Flash
#99 Best current rank: #99 in Factuality, as of Oct 14, 2026.
| Category | Muse Spark 1.3 | Step 3.5 Flash |
|---|---|---|
| General LLM | #9 · #9 in General LLM Margin 6.122448979591837 LMArena leaderboard dataset · Oct 13, 2026 | #123 · #123 in General LLM Margin 83.6734693877551 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #8 · #8 in Reasoning Margin 6.164383561643831 LMArena leaderboard dataset · Oct 13, 2026 | #124 · #124 in Reasoning Margin 85.61643835616438 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding | #18 · #18 in Coding Margin 86.36363636363636 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #18 · #18 in Coding › Agentic Margin 86.36363636363636 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #10 · #10 in Coding › Web dev Margin 8.411214953271028 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #15 · #15 in Long context Margin 10.204081632653057 LMArena leaderboard dataset · Oct 13, 2026 | #119 · #119 in Long context Margin 80.95238095238095 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #8 · #8 in Vision Margin 23.684210526315795 Epoch AI benchmarking hub · Sep 2, 2026 | — |
| Factuality | #11 · #11 in Factuality Margin 8.955223880597018 LMArena leaderboard dataset · Oct 13, 2026 | #99 · #99 in Factuality Margin 74.6268656716418 LMArena leaderboard dataset · Oct 13, 2026 |
Muse Spark 1.3: $2.0000000000000004 per 1M blended tokens.
Step 3.5 Flash: $0.15 per 1M blended tokens.
Muse Spark 1.3: closed weights.
Step 3.5 Flash: open weights.
General LLM: As of Oct 14, 2026, Muse Spark 1.3 leads Step 3.5 Flash in General LLM at #9 against #123.
Reasoning: As of Oct 14, 2026, Muse Spark 1.3 leads Step 3.5 Flash in Reasoning at #8 against #124.
Long context: As of Oct 14, 2026, Muse Spark 1.3 leads Step 3.5 Flash in Long context at #15 against #119.
Factuality: As of Oct 14, 2026, Muse Spark 1.3 leads Step 3.5 Flash in Factuality at #11 against #99.
Muse Spark 1.3 · Step 3.5 Flash
Muse Spark 1.3 or Step 3.5 Flash?
As of Oct 14, 2026, Muse Spark 1.3 leads Step 3.5 Flash in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
Muse Spark 1.3 or Step 3.5 Flash for General LLM?
As of Oct 14, 2026, Muse Spark 1.3 leads Step 3.5 Flash in General LLM at #9 against #123.
Muse Spark 1.3 or Step 3.5 Flash for Reasoning?
As of Oct 14, 2026, Muse Spark 1.3 leads Step 3.5 Flash in Reasoning at #8 against #124.
Muse Spark 1.3 or Step 3.5 Flash for Long context?
As of Oct 14, 2026, Muse Spark 1.3 leads Step 3.5 Flash in Long context at #15 against #119.