Claude Opus 4.8 vs Step 3.5 Flash
As of Oct 14, 2026, Claude Opus 4.8 leads Step 3.5 Flash in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Opus 4.8
It used to be. Was SOTA in Coding › Web dev.
Step 3.5 Flash
#99 Best current rank: #99 in Factuality, as of Oct 14, 2026.
| Category | Claude Opus 4.8 | Step 3.5 Flash |
|---|---|---|
| General LLM | #20 · #20 in General LLM Margin 13.605442176870753 LMArena leaderboard dataset · Oct 13, 2026 | #123 · #123 in General LLM Margin 83.6734693877551 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #10 · #10 in Reasoning Margin 7.534246575342465 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 |
| Science | #27 · #27 in Science Margin — Epoch AI benchmarking hub · May 28, 2026 | — |
| Coding | #12 · #12 in Coding Margin 59.09090909090909 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #12 · #12 in Coding › Agentic Margin 59.09090909090909 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #33 · Was SOTA · Coding › Web dev Margin 29.90654205607477 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #10 · Was SOTA · Long context Margin 6.802721088435391 LMArena leaderboard dataset · Oct 13, 2026 | #119 · #119 in Long context Margin 80.95238095238095 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #13 · #13 in Vision Margin 36.842105263157904 Epoch AI benchmarking hub · May 28, 2026 | — |
| Factuality | #21 · #21 in Factuality Margin 16.417910447761187 LMArena leaderboard dataset · Oct 13, 2026 | #99 · #99 in Factuality Margin 74.6268656716418 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #12 · #12 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · May 28, 2026 | — |
Claude Opus 4.8: $10 per 1M blended tokens.
Step 3.5 Flash: $0.15 per 1M blended tokens.
Claude Opus 4.8: closed weights.
Step 3.5 Flash: open weights.
General LLM: As of Oct 14, 2026, Claude Opus 4.8 leads Step 3.5 Flash in General LLM at #20 against #123.
Reasoning: As of Oct 14, 2026, Claude Opus 4.8 leads Step 3.5 Flash in Reasoning at #10 against #124.
Long context: As of Oct 14, 2026, Claude Opus 4.8 leads Step 3.5 Flash in Long context at #10 against #119.
Factuality: As of Oct 14, 2026, Claude Opus 4.8 leads Step 3.5 Flash in Factuality at #21 against #99.
Claude Opus 4.8 · Step 3.5 Flash
Claude Opus 4.8 or Step 3.5 Flash?
As of Oct 14, 2026, Claude Opus 4.8 leads Step 3.5 Flash in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Opus 4.8 or Step 3.5 Flash for General LLM?
As of Oct 14, 2026, Claude Opus 4.8 leads Step 3.5 Flash in General LLM at #20 against #123.
Claude Opus 4.8 or Step 3.5 Flash for Reasoning?
As of Oct 14, 2026, Claude Opus 4.8 leads Step 3.5 Flash in Reasoning at #10 against #124.
Claude Opus 4.8 or Step 3.5 Flash for Long context?
As of Oct 14, 2026, Claude Opus 4.8 leads Step 3.5 Flash in Long context at #10 against #119.