Claude Sonnet 5.5 vs O3 Mini
As of Oct 14, 2026, Claude Sonnet 5.5 leads O3 Mini in 3 of 4 shared categories: Reasoning, Science, and Long context.
Claude Sonnet 5.5
Yes. SOTA in co-SOTA in Coding, co-SOTA in Coding › Agentic and co-SOTA in Vision.
O3 Mini
It used to be. Was SOTA in Reasoning.
| Category | Claude Sonnet 5.5 | O3 Mini |
|---|---|---|
| General LLM | #27 · #27 in General LLM Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 | #7 · #7 in General LLM Margin — LMArena leaderboard dataset · Apr 16, 2025 |
| Reasoning | #18 · #18 in Reasoning Margin 13.013698630136986 LMArena leaderboard dataset · Oct 13, 2026 | #133 · Was SOTA · Reasoning Margin 91.78082191780823 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 | #76 · #76 in Science Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| 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 1.8691588785046775 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #11 · #11 in Long context Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #145 · #145 in Long context Margin 98.63945578231292 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 | — |
| Factuality | #16 · #16 in Factuality Margin 12.68656716417911 LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| Abstraction (ARC) | — | #51 · #51 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
O3 Mini: $1.9250000000000003 per 1M blended tokens.
Claude Sonnet 5.5: closed weights.
O3 Mini: closed weights.
General LLM: As of Oct 14, 2026, O3 Mini leads Claude Sonnet 5.5 in General LLM at #7 against #27.
Reasoning: As of Oct 14, 2026, Claude Sonnet 5.5 leads O3 Mini in Reasoning at #18 against #133.
Science: As of Oct 14, 2026, Claude Sonnet 5.5 leads O3 Mini in Science at #3 against #76.
Long context: As of Oct 14, 2026, Claude Sonnet 5.5 leads O3 Mini in Long context at #11 against #145.
Claude Sonnet 5.5 or O3 Mini?
As of Oct 14, 2026, Claude Sonnet 5.5 leads O3 Mini in 3 of 4 shared categories: Reasoning, Science, and Long context.
Claude Sonnet 5.5 or O3 Mini for General LLM?
As of Oct 14, 2026, O3 Mini leads Claude Sonnet 5.5 in General LLM at #7 against #27.
Claude Sonnet 5.5 or O3 Mini for Reasoning?
As of Oct 14, 2026, Claude Sonnet 5.5 leads O3 Mini in Reasoning at #18 against #133.
Claude Sonnet 5.5 or O3 Mini for Science?
As of Oct 14, 2026, Claude Sonnet 5.5 leads O3 Mini in Science at #3 against #76.