Claude Opus 4.5 vs O3 Mini
As of Oct 14, 2026, Claude Opus 4.5 leads O3 Mini in 4 of 5 shared categories: Reasoning, Science, Long context, and Abstraction (ARC).
| Category | Claude Opus 4.5 | O3 Mini |
|---|---|---|
| General LLM | #33 · #33 in General LLM Margin 22.448979591836732 LMArena leaderboard dataset · Oct 13, 2026 | #7 · #7 in General LLM Margin — LMArena leaderboard dataset · Apr 16, 2025 |
| Reasoning | #28 · Was SOTA · Reasoning Margin 19.86301369863014 LMArena leaderboard dataset · Oct 13, 2026 | #133 · Was SOTA · Reasoning Margin 91.78082191780823 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #16 · #16 in Math Margin 33.33333333333333 Epoch AI benchmarking hub · Nov 24, 2025 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #68 · #68 in Science Margin — Epoch AI benchmarking hub · Nov 24, 2025 | #76 · #76 in Science Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| Coding | #— · Not enough data Margin — Epoch AI benchmarking hub · Nov 24, 2025 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Web dev | #53 · Was SOTA · Coding › Web dev Margin 48.598130841121495 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #19 · Was SOTA · Long context Margin 12.925170068027214 LMArena leaderboard dataset · Oct 13, 2026 | #145 · #145 in Long context Margin 98.63945578231292 LMArena leaderboard dataset · Oct 13, 2026 |
| Factuality | #36 · #36 in Factuality Margin 27.611940298507463 LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| Abstraction (ARC) | #49 · #49 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Nov 24, 2025 | #51 · #51 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
Claude Opus 4.5: $10 per 1M blended tokens.
O3 Mini: $1.9250000000000003 per 1M blended tokens.
Claude Opus 4.5: closed weights.
O3 Mini: closed weights.
General LLM: As of Oct 14, 2026, O3 Mini leads Claude Opus 4.5 in General LLM at #7 against #33.
Reasoning: As of Oct 14, 2026, Claude Opus 4.5 leads O3 Mini in Reasoning at #28 against #133.
Science: As of Oct 14, 2026, Claude Opus 4.5 leads O3 Mini in Science at #68 against #76.
Long context: As of Oct 14, 2026, Claude Opus 4.5 leads O3 Mini in Long context at #19 against #145.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 4.5 leads O3 Mini in Abstraction (ARC) at #49 against #51.
Claude Opus 4.5 or O3 Mini?
As of Oct 14, 2026, Claude Opus 4.5 leads O3 Mini in 4 of 5 shared categories: Reasoning, Science, Long context, and Abstraction (ARC).
Claude Opus 4.5 or O3 Mini for General LLM?
As of Oct 14, 2026, O3 Mini leads Claude Opus 4.5 in General LLM at #7 against #33.
Claude Opus 4.5 or O3 Mini for Reasoning?
As of Oct 14, 2026, Claude Opus 4.5 leads O3 Mini in Reasoning at #28 against #133.
Claude Opus 4.5 or O3 Mini for Science?
As of Oct 14, 2026, Claude Opus 4.5 leads O3 Mini in Science at #68 against #76.