Claude Opus 4 vs O3 Mini
As of Oct 15, 2026, Claude Opus 4 leads O3 Mini in 2 of 5 shared categories: Reasoning and Long context.
| Category | Claude Opus 4 | O3 Mini |
|---|---|---|
| General LLM | #131 · #131 in General LLM Margin 69.68085106382979 LMArena leaderboard dataset · Oct 13, 2026 | #10 · #10 in General LLM Margin — LMArena leaderboard dataset · Apr 16, 2025 |
| Reasoning | #125 · Was SOTA · Reasoning Margin 67.02127659574468 LMArena leaderboard dataset · Oct 13, 2026 | #172 · Was SOTA · Reasoning Margin 92.02127659574468 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #29 · #29 in Math Margin 62.22222222222222 Epoch AI benchmarking hub · May 22, 2025 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #91 · #91 in Science Margin — Epoch AI benchmarking hub · May 22, 2025 | #76 · #76 in Science Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| Coding | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #86 · #86 in Long context Margin 45.744680851063826 LMArena leaderboard dataset · Oct 13, 2026 | #186 · #186 in Long context Margin 98.93617021276596 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 | — |
| Factuality | — | #— · Not enough data Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
| Abstraction (ARC) | #69 · #69 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · May 22, 2025 | #51 · #51 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jan 31, 2025 |
Claude Opus 4: price per 1M tokens is unset in the catalog.
O3 Mini: $1.9250000000000003 per 1M blended tokens.
Claude Opus 4: closed weights.
O3 Mini: closed weights.
General LLM: As of Oct 15, 2026, O3 Mini leads Claude Opus 4 in General LLM at #10 against #131.
Reasoning: As of Oct 15, 2026, Claude Opus 4 leads O3 Mini in Reasoning at #125 against #172.
Science: As of Oct 15, 2026, O3 Mini leads Claude Opus 4 in Science at #76 against #91.
Long context: As of Oct 15, 2026, Claude Opus 4 leads O3 Mini in Long context at #86 against #186.
Abstraction (ARC): As of Oct 15, 2026, O3 Mini leads Claude Opus 4 in Abstraction (ARC) at #51 against #69.
Claude Opus 4 or O3 Mini?
As of Oct 15, 2026, Claude Opus 4 leads O3 Mini in 2 of 5 shared categories: Reasoning and Long context.
Claude Opus 4 or O3 Mini for General LLM?
As of Oct 15, 2026, O3 Mini leads Claude Opus 4 in General LLM at #10 against #131.
Claude Opus 4 or O3 Mini for Reasoning?
As of Oct 15, 2026, Claude Opus 4 leads O3 Mini in Reasoning at #125 against #172.
Claude Opus 4 or O3 Mini for Science?
As of Oct 15, 2026, O3 Mini leads Claude Opus 4 in Science at #76 against #91.