Claude Sonnet 5.5 vs O1
As of Oct 15, 2026, Claude Sonnet 5.5 leads O1 in 5 of 5 shared categories: General LLM, Reasoning, Math, Science, and Long context.
Claude Sonnet 5.5
Yes. SOTA in Coding (tied), Coding › Agentic (tied), and Vision (tied).
O1
It used to be. Was SOTA in General LLM.
| Category | Claude Sonnet 5.5 | O1 |
|---|---|---|
| General LLM | #29 · #29 in General LLM Margin 15.425531914893611 LMArena leaderboard dataset · Oct 13, 2026 | #146 · Was SOTA · General LLM Margin 77.65957446808511 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #18 · #18 in Reasoning Margin 10.106382978723403 LMArena leaderboard dataset · Oct 13, 2026 | #153 · Was SOTA · Reasoning Margin 81.91489361702128 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #4 · #4 in Math Margin 6.666666666666671 Epoch AI benchmarking hub · Sep 28, 2026 | #34 · #34 in Math Margin 75.55555555555556 Epoch AI benchmarking hub · Dec 17, 2024 |
| Science | #3 · #3 in Science Margin — Epoch AI benchmarking hub · Sep 28, 2026 | #77 · #77 in Science Margin — Epoch AI benchmarking hub · Dec 17, 2024 |
| 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 | — |
| Long context | #11 · #11 in Long context Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 | #143 · Was SOTA · Long context Margin 76.06382978723404 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 | #— · Not enough data Margin — Epoch AI benchmarking hub · Dec 17, 2024 |
| Abstraction (ARC) | — | #57 · #57 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Dec 17, 2024 |
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
O1: $26.25 per 1M blended tokens.
Claude Sonnet 5.5: closed weights.
O1: closed weights.
General LLM: As of Oct 15, 2026, Claude Sonnet 5.5 leads O1 in General LLM at #29 against #146.
Reasoning: As of Oct 15, 2026, Claude Sonnet 5.5 leads O1 in Reasoning at #18 against #153.
Math: As of Oct 15, 2026, Claude Sonnet 5.5 leads O1 in Math at #4 against #34.
Science: As of Oct 15, 2026, Claude Sonnet 5.5 leads O1 in Science at #3 against #77.
Long context: As of Oct 15, 2026, Claude Sonnet 5.5 leads O1 in Long context at #11 against #143.
Claude Sonnet 5.5 or O1?
As of Oct 15, 2026, Claude Sonnet 5.5 leads O1 in 5 of 5 shared categories: General LLM, Reasoning, Math, Science, and Long context.
Claude Sonnet 5.5 or O1 for General LLM?
As of Oct 15, 2026, Claude Sonnet 5.5 leads O1 in General LLM at #29 against #146.
Claude Sonnet 5.5 or O1 for Reasoning?
As of Oct 15, 2026, Claude Sonnet 5.5 leads O1 in Reasoning at #18 against #153.
Claude Sonnet 5.5 or O1 for Math?
As of Oct 15, 2026, Claude Sonnet 5.5 leads O1 in Math at #4 against #34.