Claude Sonnet 4.5 vs O3 Mini
As of Oct 14, 2026, Claude Sonnet 4.5 leads O3 Mini in 2 of 5 shared categories: Reasoning and Long context.
Claude Sonnet 4.5
It used to be. Was SOTA in General LLM.
O3 Mini
It used to be. Was SOTA in Reasoning.
| Category | Claude Sonnet 4.5 | O3 Mini |
|---|---|---|
| General LLM | #49 · Was SOTA · General LLM Margin 33.33333333333333 LMArena leaderboard dataset · Oct 13, 2026 | #7 · #7 in General LLM Margin — LMArena leaderboard dataset · Apr 16, 2025 |
| Reasoning | #40 · Was SOTA · Reasoning Margin 28.082191780821915 LMArena leaderboard dataset · Oct 13, 2026 | #133 · Was SOTA · Reasoning Margin 91.78082191780823 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #25 · #25 in Math Margin 53.333333333333336 Epoch AI benchmarking hub · Sep 29, 2025 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #82 · #82 in Science Margin — Epoch AI benchmarking hub · Sep 29, 2025 | #76 · #76 in Science Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| Coding | #— · Not enough data Margin — Epoch AI benchmarking hub · Sep 29, 2025 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Web dev | #78 · Was SOTA · Coding › Web dev Margin 71.96261682242991 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #29 · Was SOTA · Long context Margin 19.72789115646259 LMArena leaderboard dataset · Oct 13, 2026 | #145 · #145 in Long context Margin 98.63945578231292 LMArena leaderboard dataset · Oct 13, 2026 |
| Factuality | #50 · #50 in Factuality Margin 38.059701492537314 LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| Abstraction (ARC) | #66 · #66 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 29, 2025 | #51 · #51 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
Claude Sonnet 4.5: $6 per 1M blended tokens.
O3 Mini: $1.9250000000000003 per 1M blended tokens.
Claude Sonnet 4.5: closed weights.
O3 Mini: closed weights.
General LLM: As of Oct 14, 2026, O3 Mini leads Claude Sonnet 4.5 in General LLM at #7 against #49.
Reasoning: As of Oct 14, 2026, Claude Sonnet 4.5 leads O3 Mini in Reasoning at #40 against #133.
Science: As of Oct 14, 2026, O3 Mini leads Claude Sonnet 4.5 in Science at #76 against #82.
Long context: As of Oct 14, 2026, Claude Sonnet 4.5 leads O3 Mini in Long context at #29 against #145.
Abstraction (ARC): As of Oct 14, 2026, O3 Mini leads Claude Sonnet 4.5 in Abstraction (ARC) at #51 against #66.
Claude Sonnet 4.5 or O3 Mini?
As of Oct 14, 2026, Claude Sonnet 4.5 leads O3 Mini in 2 of 5 shared categories: Reasoning and Long context.
Claude Sonnet 4.5 or O3 Mini for General LLM?
As of Oct 14, 2026, O3 Mini leads Claude Sonnet 4.5 in General LLM at #7 against #49.
Claude Sonnet 4.5 or O3 Mini for Reasoning?
As of Oct 14, 2026, Claude Sonnet 4.5 leads O3 Mini in Reasoning at #40 against #133.
Claude Sonnet 4.5 or O3 Mini for Science?
As of Oct 14, 2026, O3 Mini leads Claude Sonnet 4.5 in Science at #76 against #82.