GPT-5.5 vs Step 3.5 Flash
As of Oct 14, 2026, GPT-5.5 leads Step 3.5 Flash in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
GPT-5.5
It used to be. Was SOTA in General LLM.
Step 3.5 Flash
#99 Best current rank: #99 in Factuality, as of Oct 14, 2026.
| Category | GPT-5.5 | Step 3.5 Flash |
|---|---|---|
| General LLM | #21 · Was SOTA · General LLM Margin 14.285714285714292 LMArena leaderboard dataset · Oct 13, 2026 | #123 · #123 in General LLM Margin 83.6734693877551 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #25 · #25 in Reasoning Margin 17.808219178082197 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 | #30 · #30 in Science Margin — Epoch AI benchmarking hub · Apr 23, 2026 | — |
| Coding | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Web dev | #44 · #44 in Coding › Web dev Margin 40.18691588785047 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #23 · Was SOTA · Long context Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 | #119 · #119 in Long context Margin 80.95238095238095 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #10 · Was SOTA · Vision Margin 28.94736842105263 Epoch AI benchmarking hub · Apr 23, 2026 | — |
| Factuality | #5 · Was SOTA · Factuality Margin 4.477611940298502 LMArena leaderboard dataset · Oct 13, 2026 | #99 · #99 in Factuality Margin 74.6268656716418 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #7 · #7 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 23, 2026 | — |
GPT-5.5: $11.25 per 1M blended tokens.
Step 3.5 Flash: $0.15 per 1M blended tokens.
GPT-5.5: closed weights.
Step 3.5 Flash: open weights.
General LLM: As of Oct 14, 2026, GPT-5.5 leads Step 3.5 Flash in General LLM at #21 against #123.
Reasoning: As of Oct 14, 2026, GPT-5.5 leads Step 3.5 Flash in Reasoning at #25 against #124.
Long context: As of Oct 14, 2026, GPT-5.5 leads Step 3.5 Flash in Long context at #23 against #119.
Factuality: As of Oct 14, 2026, GPT-5.5 leads Step 3.5 Flash in Factuality at #5 against #99.
GPT-5.5 or Step 3.5 Flash?
As of Oct 14, 2026, GPT-5.5 leads Step 3.5 Flash in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
GPT-5.5 or Step 3.5 Flash for General LLM?
As of Oct 14, 2026, GPT-5.5 leads Step 3.5 Flash in General LLM at #21 against #123.
GPT-5.5 or Step 3.5 Flash for Reasoning?
As of Oct 14, 2026, GPT-5.5 leads Step 3.5 Flash in Reasoning at #25 against #124.
GPT-5.5 or Step 3.5 Flash for Long context?
As of Oct 14, 2026, GPT-5.5 leads Step 3.5 Flash in Long context at #23 against #119.