Claude Opus 4.6 vs O3 Mini
As of Oct 14, 2026, Claude Opus 4.6 leads O3 Mini in 4 of 4 shared categories: General LLM, Reasoning, Science, and Long context.
Claude Opus 4.6
Close. Near-SOTA in Reasoning, rank #2.
O3 Mini
It used to be. Was SOTA in Reasoning.
| Category | Claude Opus 4.6 | O3 Mini |
|---|---|---|
| General LLM | #4 · Near-SOTA · General LLM Margin 2.7210884353741562 LMArena leaderboard dataset · Oct 13, 2026 | #7 · #7 in General LLM Margin — LMArena leaderboard dataset · Apr 16, 2025 |
| Reasoning | #2 · Near-SOTA · Reasoning Margin 2.0547945205479436 LMArena leaderboard dataset · Oct 13, 2026 | #133 · Was SOTA · Reasoning Margin 91.78082191780823 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #11 · #11 in Math Margin 22.22222222222223 Epoch AI benchmarking hub · Feb 5, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #32 · #32 in Science Margin — Epoch AI benchmarking hub · Feb 5, 2026 | #76 · #76 in Science Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| Coding | #— · Not enough data Margin — Epoch AI benchmarking hub · Feb 5, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Web dev | #35 · Was SOTA · Coding › Web dev Margin 31.775700934579433 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #2 · Near-SOTA · Long context Margin 0.6802721088435391 LMArena leaderboard dataset · Oct 13, 2026 | #145 · #145 in Long context Margin 98.63945578231292 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 | — |
| Factuality | #3 · Near-SOTA · Factuality Margin 2.9850746268656536 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 Opus 4.6: $10 per 1M blended tokens.
O3 Mini: $1.9250000000000003 per 1M blended tokens.
Claude Opus 4.6: closed weights.
O3 Mini: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 4.6 leads O3 Mini in General LLM at #4 against #7.
Reasoning: As of Oct 14, 2026, Claude Opus 4.6 leads O3 Mini in Reasoning at #2 against #133.
Science: As of Oct 14, 2026, Claude Opus 4.6 leads O3 Mini in Science at #32 against #76.
Long context: As of Oct 14, 2026, Claude Opus 4.6 leads O3 Mini in Long context at #2 against #145.
Claude Opus 4.6 or O3 Mini?
As of Oct 14, 2026, Claude Opus 4.6 leads O3 Mini in 4 of 4 shared categories: General LLM, Reasoning, Science, and Long context.
Claude Opus 4.6 or O3 Mini for General LLM?
As of Oct 14, 2026, Claude Opus 4.6 leads O3 Mini in General LLM at #4 against #7.
Claude Opus 4.6 or O3 Mini for Reasoning?
As of Oct 14, 2026, Claude Opus 4.6 leads O3 Mini in Reasoning at #2 against #133.
Claude Opus 4.6 or O3 Mini for Science?
As of Oct 14, 2026, Claude Opus 4.6 leads O3 Mini in Science at #32 against #76.