Claude Sonnet 5.5 vs Step 5 Preview
As of Oct 15, 2026, Claude Sonnet 5.5 leads Step 5 Preview in 5 of 5 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, and Factuality.
Claude Sonnet 5.5
Yes. SOTA in Coding (tied), Coding › Agentic (tied), and Vision (tied).
Step 5 Preview
#33 Best current rank: #33 in Coding › Web dev, as of Oct 15, 2026.
| Category | Claude Sonnet 5.5 | Step 5 Preview |
|---|---|---|
| General LLM | #29 · #29 in General LLM Margin 15.425531914893611 LMArena leaderboard dataset · Oct 13, 2026 | #77 · #77 in General LLM Margin 40.95744680851064 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #18 · #18 in Reasoning Margin 10.106382978723403 LMArena leaderboard dataset · Oct 13, 2026 | #63 · #63 in Reasoning Margin 34.04255319148936 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #4 · #4 in Math Margin 6.666666666666671 Epoch AI benchmarking hub · Sep 28, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #3 · #3 in Science Margin — Epoch AI benchmarking hub · Sep 28, 2026 | — |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #3 · Near-SOTA · Coding › Web dev Margin 1.5999999999999943 LMArena leaderboard dataset · Oct 13, 2026 | #33 · #33 in Coding › Web dev Margin 25.599999999999994 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #11 · #11 in Long context Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 | #68 · #68 in Long context Margin 36.170212765957444 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #17 · #17 in Factuality Margin 10.465116279069761 LMArena leaderboard dataset · Oct 13, 2026 | #69 · #69 in Factuality Margin 40.69767441860465 LMArena leaderboard dataset · Oct 13, 2026 |
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
Step 5 Preview: $1.4249999999999998 per 1M blended tokens.
Claude Sonnet 5.5: closed weights.
Step 5 Preview: closed weights.
General LLM: As of Oct 15, 2026, Claude Sonnet 5.5 leads Step 5 Preview in General LLM at #29 against #77.
Reasoning: As of Oct 15, 2026, Claude Sonnet 5.5 leads Step 5 Preview in Reasoning at #18 against #63.
Coding › Web dev: As of Oct 15, 2026, Claude Sonnet 5.5 leads Step 5 Preview in Coding › Web dev at #3 against #33.
Long context: As of Oct 15, 2026, Claude Sonnet 5.5 leads Step 5 Preview in Long context at #11 against #68.
Factuality: As of Oct 15, 2026, Claude Sonnet 5.5 leads Step 5 Preview in Factuality at #17 against #69.
Claude Sonnet 5.5 · Step 5 Preview
Claude Sonnet 5.5 or Step 5 Preview?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Step 5 Preview in 5 of 5 shared categories: General LLM, Reasoning, Coding › Web dev, Long context, and Factuality.
Claude Sonnet 5.5 or Step 5 Preview for General LLM?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Step 5 Preview in General LLM at #29 against #77.
Claude Sonnet 5.5 or Step 5 Preview for Reasoning?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Step 5 Preview in Reasoning at #18 against #63.
Claude Sonnet 5.5 or Step 5 Preview for Coding › Web dev?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Step 5 Preview in Coding › Web dev at #3 against #33.