Claude Opus 4.8 vs O3
As of Oct 14, 2026, Claude Opus 4.8 leads O3 in 6 of 6 shared categories: General LLM, Reasoning, Science, Long context, Factuality, and Abstraction (ARC).
Claude Opus 4.8
It used to be. Was SOTA in Coding › Web dev.
O3
It used to be. Was SOTA in General LLM.
| Category | Claude Opus 4.8 | O3 |
|---|---|---|
| General LLM | #20 · #20 in General LLM Margin 13.605442176870753 LMArena leaderboard dataset · Oct 13, 2026 | #78 · Was SOTA · General LLM Margin 53.06122448979592 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #10 · #10 in Reasoning Margin 7.534246575342465 LMArena leaderboard dataset · Oct 13, 2026 | #90 · Was SOTA · Reasoning Margin 62.32876712328767 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 | #27 · #27 in Science Margin — Epoch AI benchmarking hub · May 28, 2026 | #67 · #67 in Science Margin — Epoch AI benchmarking hub · Apr 16, 2025 |
| Coding | #12 · #12 in Coding Margin 59.09090909090909 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Apr 16, 2025 |
| Coding › Agentic | #12 · #12 in Coding › Agentic Margin 59.09090909090909 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #33 · Was SOTA · Coding › Web dev Margin 29.90654205607477 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #10 · Was SOTA · Long context Margin 6.802721088435391 LMArena leaderboard dataset · Oct 13, 2026 | #110 · Was SOTA · Long context Margin 74.82993197278913 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #13 · #13 in Vision Margin 36.842105263157904 Epoch AI benchmarking hub · May 28, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #21 · #21 in Factuality Margin 16.417910447761187 LMArena leaderboard dataset · Oct 13, 2026 | #105 · #105 in Factuality Margin 79.1044776119403 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #12 · #12 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · May 28, 2026 | #37 · #37 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Apr 16, 2025 |
Claude Opus 4.8: $10 per 1M blended tokens.
O3: $3.5 per 1M blended tokens.
Claude Opus 4.8: closed weights.
O3: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 4.8 leads O3 in General LLM at #20 against #78.
Reasoning: As of Oct 14, 2026, Claude Opus 4.8 leads O3 in Reasoning at #10 against #90.
Science: As of Oct 14, 2026, Claude Opus 4.8 leads O3 in Science at #27 against #67.
Long context: As of Oct 14, 2026, Claude Opus 4.8 leads O3 in Long context at #10 against #110.
Factuality: As of Oct 14, 2026, Claude Opus 4.8 leads O3 in Factuality at #21 against #105.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 4.8 leads O3 in Abstraction (ARC) at #12 against #37.
Claude Opus 4.8 or O3?
As of Oct 14, 2026, Claude Opus 4.8 leads O3 in 6 of 6 shared categories: General LLM, Reasoning, Science, Long context, Factuality, and Abstraction (ARC).
Claude Opus 4.8 or O3 for General LLM?
As of Oct 14, 2026, Claude Opus 4.8 leads O3 in General LLM at #20 against #78.
Claude Opus 4.8 or O3 for Reasoning?
As of Oct 14, 2026, Claude Opus 4.8 leads O3 in Reasoning at #10 against #90.
Claude Opus 4.8 or O3 for Science?
As of Oct 14, 2026, Claude Opus 4.8 leads O3 in Science at #27 against #67.