Claude Opus 5 vs O3
As of Oct 15, 2026, Claude Opus 5 leads O3 in 6 of 6 shared categories: General LLM, Reasoning, Science, Long context, Factuality, and Abstraction (ARC).
| Category | Claude Opus 5 | O3 |
|---|---|---|
| General LLM | #11 · Was SOTA · General LLM Margin 5.851063829787236 LMArena leaderboard dataset · Oct 13, 2026 | #100 · Was SOTA · General LLM Margin 53.191489361702125 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #9 · Was SOTA · Reasoning Margin 5.319148936170208 LMArena leaderboard dataset · Oct 13, 2026 | #117 · Was SOTA · Reasoning Margin 62.765957446808514 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #20 · Was SOTA · Math Margin 42.22222222222222 Epoch AI benchmarking hub · Apr 16, 2025 |
| Science | #12 · #12 in Science Margin — Epoch AI benchmarking hub · Jul 24, 2026 | #67 · #67 in Science Margin — Epoch AI benchmarking hub · Apr 16, 2025 |
| Coding | #4 · #4 in Coding Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Coding › Agentic | #4 · #4 in Coding › Agentic Margin 22.727272727272734 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #6 · Near-SOTA · Coding › Web dev Margin 4 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #9 · Was SOTA · Long context Margin 4.7872340425531945 LMArena leaderboard dataset · Oct 13, 2026 | #145 · Was SOTA · Long context Margin 77.12765957446808 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #12 · #12 in Vision Margin 36.8421052631579 Epoch AI benchmarking hub · Jul 24, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #4 · Near-SOTA · Factuality Margin 2.9069767441860535 LMArena leaderboard dataset · Oct 13, 2026 | #139 · #139 in Factuality Margin 81.3953488372093 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 24, 2026 | #37 · #37 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 16, 2025 |
Claude Opus 5: $10 per 1M blended tokens.
O3: $3.5 per 1M blended tokens.
Claude Opus 5: closed weights.
O3: closed weights.
General LLM: As of Oct 15, 2026, Claude Opus 5 leads O3 in General LLM at #11 against #100.
Reasoning: As of Oct 15, 2026, Claude Opus 5 leads O3 in Reasoning at #9 against #117.
Science: As of Oct 15, 2026, Claude Opus 5 leads O3 in Science at #12 against #67.
Long context: As of Oct 15, 2026, Claude Opus 5 leads O3 in Long context at #9 against #145.
Factuality: As of Oct 15, 2026, Claude Opus 5 leads O3 in Factuality at #4 against #139.
Abstraction (ARC): As of Oct 15, 2026, Claude Opus 5 leads O3 in Abstraction (ARC) at #3 against #37.
Claude Opus 5 or O3?
As of Oct 15, 2026, Claude Opus 5 leads O3 in 6 of 6 shared categories: General LLM, Reasoning, Science, Long context, Factuality, and Abstraction (ARC).
Claude Opus 5 or O3 for General LLM?
As of Oct 15, 2026, Claude Opus 5 leads O3 in General LLM at #11 against #100.
Claude Opus 5 or O3 for Reasoning?
As of Oct 15, 2026, Claude Opus 5 leads O3 in Reasoning at #9 against #117.
Claude Opus 5 or O3 for Science?
As of Oct 15, 2026, Claude Opus 5 leads O3 in Science at #12 against #67.