Claude Opus 4.6 vs Step 3.5 Flash
As of Oct 14, 2026, Claude Opus 4.6 leads Step 3.5 Flash in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Opus 4.6
Close. Near-SOTA in Reasoning, rank #2.
Step 3.5 Flash
#99 Best current rank: #99 in Factuality, as of Oct 14, 2026.
| Category | Claude Opus 4.6 | Step 3.5 Flash |
|---|---|---|
| General LLM | #4 · Near-SOTA · General LLM Margin 2.7210884353741562 LMArena leaderboard dataset · Oct 13, 2026 | #123 · #123 in General LLM Margin 83.6734693877551 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #2 · Near-SOTA · Reasoning Margin 2.0547945205479436 LMArena leaderboard dataset · Oct 13, 2026 | #124 · #124 in Reasoning Margin 85.61643835616438 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #11 · #11 in Math Margin 22.22222222222223 Epoch AI benchmarking hub · Feb 5, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #32 · #32 in Science Margin — Epoch AI benchmarking hub · Feb 5, 2026 | — |
| Coding | #— · Not enough data Margin — Epoch AI benchmarking hub · Feb 5, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Web dev | #35 · Was SOTA · Coding › Web dev Margin 31.775700934579433 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #2 · Near-SOTA · Long context Margin 0.6802721088435391 LMArena leaderboard dataset · Oct 13, 2026 | #119 · #119 in Long context Margin 80.95238095238095 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 | — |
| Factuality | #3 · Near-SOTA · Factuality Margin 2.9850746268656536 LMArena leaderboard dataset · Oct 13, 2026 | #99 · #99 in Factuality Margin 74.6268656716418 LMArena leaderboard dataset · Oct 13, 2026 |
Claude Opus 4.6: $10 per 1M blended tokens.
Step 3.5 Flash: $0.15 per 1M blended tokens.
Claude Opus 4.6: closed weights.
Step 3.5 Flash: open weights.
General LLM: As of Oct 14, 2026, Claude Opus 4.6 leads Step 3.5 Flash in General LLM at #4 against #123.
Reasoning: As of Oct 14, 2026, Claude Opus 4.6 leads Step 3.5 Flash in Reasoning at #2 against #124.
Long context: As of Oct 14, 2026, Claude Opus 4.6 leads Step 3.5 Flash in Long context at #2 against #119.
Factuality: As of Oct 14, 2026, Claude Opus 4.6 leads Step 3.5 Flash in Factuality at #3 against #99.
Claude Opus 4.6 · Step 3.5 Flash
Claude Opus 4.6 or Step 3.5 Flash?
As of Oct 14, 2026, Claude Opus 4.6 leads Step 3.5 Flash in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Opus 4.6 or Step 3.5 Flash for General LLM?
As of Oct 14, 2026, Claude Opus 4.6 leads Step 3.5 Flash in General LLM at #4 against #123.
Claude Opus 4.6 or Step 3.5 Flash for Reasoning?
As of Oct 14, 2026, Claude Opus 4.6 leads Step 3.5 Flash in Reasoning at #2 against #124.
Claude Opus 4.6 or Step 3.5 Flash for Long context?
As of Oct 14, 2026, Claude Opus 4.6 leads Step 3.5 Flash in Long context at #2 against #119.