Claude Opus 5.5 vs GPT-5 Mini
As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5 Mini in 6 of 6 shared categories: General LLM, Reasoning, Science, Long context, Factuality, and Abstraction (ARC).
Claude Opus 5.5
Yes. SOTA in co-SOTA in Reasoning, co-SOTA in Coding, co-SOTA in Coding › Agentic, Coding › Web dev, co-SOTA in Long context and co-SOTA in Factuality.
GPT-5 Mini
It used to be. Was SOTA in Math.
| Category | Claude Opus 5.5 | GPT-5 Mini |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.3605442176870781 LMArena leaderboard dataset · Oct 13, 2026 | #128 · #128 in General LLM Margin 87.07482993197279 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #130 · #130 in Reasoning Margin 89.72602739726028 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #21 · Was SOTA · Math Margin 44.44444444444444 Epoch AI benchmarking hub · Aug 7, 2025 |
| Science | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #81 · #81 in Science Margin — Epoch AI benchmarking hub · Aug 7, 2025 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — Epoch AI benchmarking hub · Aug 7, 2025 |
| Coding › Agentic | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | — |
| Coding › Web dev | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #146 · #146 in Long context Margin 99.31972789115646 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #110 · #110 in Factuality Margin 82.83582089552239 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | #41 · #41 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Aug 7, 2025 |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
GPT-5 Mini: $0.6875 per 1M blended tokens.
Claude Opus 5.5: closed weights.
GPT-5 Mini: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5 Mini in General LLM at #2 against #128.
Reasoning: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5 Mini in Reasoning at #1 against #130.
Science: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5 Mini in Science at #31 against #81.
Long context: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5 Mini in Long context at #1 against #146.
Factuality: As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5 Mini in Factuality at #1 against #110.
Abstraction (ARC): As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5 Mini in Abstraction (ARC) at #1 against #41.
Claude Opus 5.5 or GPT-5 Mini?
As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5 Mini in 6 of 6 shared categories: General LLM, Reasoning, Science, Long context, Factuality, and Abstraction (ARC).
Claude Opus 5.5 or GPT-5 Mini for General LLM?
As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5 Mini in General LLM at #2 against #128.
Claude Opus 5.5 or GPT-5 Mini for Reasoning?
As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5 Mini in Reasoning at #1 against #130.
Claude Opus 5.5 or GPT-5 Mini for Science?
As of Oct 14, 2026, Claude Opus 5.5 leads GPT-5 Mini in Science at #31 against #81.