Claude Fable 5 vs Step 3.5 Flash
As of Oct 15, 2026, Claude Fable 5 leads Step 3.5 Flash in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Fable 5
Close. Near-SOTA in General LLM, rank #3.
Step 3.5 Flash
#128 Best current rank: #128 in Factuality, as of Oct 15, 2026.
| Category | Claude Fable 5 | Step 3.5 Flash |
|---|---|---|
| General LLM | #3 · Near-SOTA · General LLM Margin 1.5957446808510696 LMArena leaderboard dataset · Oct 13, 2026 | #159 · #159 in General LLM Margin 84.57446808510639 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #3 · Near-SOTA · Reasoning Margin 2.1276595744680833 LMArena leaderboard dataset · Oct 13, 2026 | #162 · #162 in Reasoning Margin 86.70212765957447 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 | #56 · #56 in Science Margin — Epoch AI benchmarking hub · Jun 9, 2026 | — |
| Coding | #6 · #6 in Coding Margin 31.818181818181813 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #6 · #6 in Coding › Agentic Margin 31.818181818181813 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #19 · Was SOTA · Coding › Web dev Margin 14.400000000000006 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #3 · Near-SOTA · Long context Margin 1.5957446808510696 LMArena leaderboard dataset · Oct 13, 2026 | #156 · #156 in Long context Margin 82.97872340425532 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #5 · Was SOTA · Vision Margin 15.78947368421052 Epoch AI benchmarking hub · Jun 9, 2026 | — |
| Factuality | #7 · Was SOTA · Factuality Margin 4.6511627906976685 LMArena leaderboard dataset · Oct 13, 2026 | #128 · #128 in Factuality Margin 75 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jun 9, 2026 | — |
Claude Fable 5: $20 per 1M blended tokens.
Step 3.5 Flash: $0.15 per 1M blended tokens.
Claude Fable 5: closed weights.
Step 3.5 Flash: open weights.
General LLM: As of Oct 15, 2026, Claude Fable 5 leads Step 3.5 Flash in General LLM at #3 against #159.
Reasoning: As of Oct 15, 2026, Claude Fable 5 leads Step 3.5 Flash in Reasoning at #3 against #162.
Long context: As of Oct 15, 2026, Claude Fable 5 leads Step 3.5 Flash in Long context at #3 against #156.
Factuality: As of Oct 15, 2026, Claude Fable 5 leads Step 3.5 Flash in Factuality at #7 against #128.
Claude Fable 5 · Step 3.5 Flash
Claude Fable 5 or Step 3.5 Flash?
As of Oct 15, 2026, Claude Fable 5 leads Step 3.5 Flash in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Fable 5 or Step 3.5 Flash for General LLM?
As of Oct 15, 2026, Claude Fable 5 leads Step 3.5 Flash in General LLM at #3 against #159.
Claude Fable 5 or Step 3.5 Flash for Reasoning?
As of Oct 15, 2026, Claude Fable 5 leads Step 3.5 Flash in Reasoning at #3 against #162.
Claude Fable 5 or Step 3.5 Flash for Long context?
As of Oct 15, 2026, Claude Fable 5 leads Step 3.5 Flash in Long context at #3 against #156.