GPT-5.5 vs Step 5 Preview
As of Oct 14, 2026, GPT-5.5 leads Step 5 Preview in 4 of 5 shared categories: General LLM, Reasoning, Long context, and Factuality.
GPT-5.5
It used to be. Was SOTA in General LLM.
Step 5 Preview
#31 Best current rank: #31 in Coding › Web dev, as of Oct 14, 2026.
| Category | GPT-5.5 | Step 5 Preview |
|---|---|---|
| General LLM | #21 · Was SOTA · General LLM Margin 14.285714285714292 LMArena leaderboard dataset · Oct 13, 2026 | #60 · #60 in General LLM Margin 40.816326530612244 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #25 · #25 in Reasoning Margin 17.808219178082197 LMArena leaderboard dataset · Oct 13, 2026 | #49 · #49 in Reasoning Margin 34.246575342465746 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 | #31 · #31 in Coding › Web dev Margin 28.037383177570092 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #23 · Was SOTA · Long context Margin 15.646258503401356 LMArena leaderboard dataset · Oct 13, 2026 | #56 · #56 in Long context Margin 38.095238095238095 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #10 · Was SOTA · Vision Margin 28.94736842105263 Epoch AI benchmarking hub · Apr 23, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #5 · Was SOTA · Factuality Margin 4.477611940298502 LMArena leaderboard dataset · Oct 13, 2026 | #57 · #57 in Factuality Margin 43.28358208955224 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 5 Preview: $1.4249999999999998 per 1M blended tokens.
GPT-5.5: closed weights.
Step 5 Preview: closed weights.
General LLM: As of Oct 14, 2026, GPT-5.5 leads Step 5 Preview in General LLM at #21 against #60.
Reasoning: As of Oct 14, 2026, GPT-5.5 leads Step 5 Preview in Reasoning at #25 against #49.
Coding › Web dev: As of Oct 14, 2026, Step 5 Preview leads GPT-5.5 in Coding › Web dev at #31 against #44.
Long context: As of Oct 14, 2026, GPT-5.5 leads Step 5 Preview in Long context at #23 against #56.
Factuality: As of Oct 14, 2026, GPT-5.5 leads Step 5 Preview in Factuality at #5 against #57.
GPT-5.5 or Step 5 Preview?
As of Oct 14, 2026, GPT-5.5 leads Step 5 Preview in 4 of 5 shared categories: General LLM, Reasoning, Long context, and Factuality.
GPT-5.5 or Step 5 Preview for General LLM?
As of Oct 14, 2026, GPT-5.5 leads Step 5 Preview in General LLM at #21 against #60.
GPT-5.5 or Step 5 Preview for Reasoning?
As of Oct 14, 2026, GPT-5.5 leads Step 5 Preview in Reasoning at #25 against #49.
GPT-5.5 or Step 5 Preview for Coding › Web dev?
As of Oct 14, 2026, Step 5 Preview leads GPT-5.5 in Coding › Web dev at #31 against #44.