GPT-5.4 vs Step 3.5 Flash
As of Oct 14, 2026, GPT-5.4 leads Step 3.5 Flash in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
GPT-5.4
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-5.4 | Step 3.5 Flash |
|---|---|---|
| General LLM | #28 · Was SOTA · General LLM Margin 19.04761904761905 LMArena leaderboard dataset · Oct 13, 2026 | #123 · #123 in General LLM Margin 83.6734693877551 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #29 · #29 in Reasoning Margin 20.54794520547945 LMArena leaderboard dataset · Oct 13, 2026 | #124 · #124 in Reasoning Margin 85.61643835616438 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #9 · #9 in Math Margin 17.777777777777757 Epoch AI benchmarking hub · Mar 5, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #16 · #16 in Science Margin — Epoch AI benchmarking hub · Mar 5, 2026 | — |
| Coding | #— · Not enough data Margin — Epoch AI benchmarking hub · Mar 5, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Web dev | #55 · #55 in Coding › Web dev Margin 50.467289719626166 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #34 · #34 in Long context Margin 23.12925170068027 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 | #6 · Was SOTA · Factuality Margin 5.22388059701494 LMArena leaderboard dataset · Oct 13, 2026 | #99 · #99 in Factuality Margin 74.6268656716418 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #10 · #10 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Mar 5, 2026 | — |
GPT-5.4: $5.625 per 1M blended tokens.
Step 3.5 Flash: $0.15 per 1M blended tokens.
GPT-5.4: closed weights.
Step 3.5 Flash: open weights.
General LLM: As of Oct 14, 2026, GPT-5.4 leads Step 3.5 Flash in General LLM at #28 against #123.
Reasoning: As of Oct 14, 2026, GPT-5.4 leads Step 3.5 Flash in Reasoning at #29 against #124.
Long context: As of Oct 14, 2026, GPT-5.4 leads Step 3.5 Flash in Long context at #34 against #119.
Factuality: As of Oct 14, 2026, GPT-5.4 leads Step 3.5 Flash in Factuality at #6 against #99.
GPT-5.4 or Step 3.5 Flash?
As of Oct 14, 2026, GPT-5.4 leads Step 3.5 Flash in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
GPT-5.4 or Step 3.5 Flash for General LLM?
As of Oct 14, 2026, GPT-5.4 leads Step 3.5 Flash in General LLM at #28 against #123.
GPT-5.4 or Step 3.5 Flash for Reasoning?
As of Oct 14, 2026, GPT-5.4 leads Step 3.5 Flash in Reasoning at #29 against #124.
GPT-5.4 or Step 3.5 Flash for Long context?
As of Oct 14, 2026, GPT-5.4 leads Step 3.5 Flash in Long context at #34 against #119.