Claude Opus 5 vs Gemini 2.5 Flash
As of Oct 14, 2026, Claude Opus 5 leads Gemini 2.5 Flash in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Opus 5
Close. Near-SOTA in Factuality, rank #4.
Gemini 2.5 Flash
#72 Best current rank: #72 in Factuality, as of Oct 14, 2026.
| Category | Claude Opus 5 | Gemini 2.5 Flash |
|---|---|---|
| General LLM | #11 · Was SOTA · General LLM Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 | #108 · #108 in General LLM Margin 73.46938775510205 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #9 · Was SOTA · Reasoning Margin 6.849315068493155 LMArena leaderboard dataset · Oct 13, 2026 | #114 · #114 in Reasoning Margin 78.76712328767124 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| Science | #12 · #12 in Science Margin — Epoch AI benchmarking hub · Jul 24, 2026 | — |
| 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 · Was SOTA · Coding › Web dev Margin 4.672897196261687 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Long context | #9 · Was SOTA · Long context Margin 6.122448979591837 LMArena leaderboard dataset · Oct 13, 2026 | #104 · #104 in Long context Margin 70.74829931972789 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 3.731343283582092 LMArena leaderboard dataset · Oct 13, 2026 | #72 · #72 in Factuality Margin 54.47761194029851 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #3 · #3 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Jul 24, 2026 | — |
Claude Opus 5: $10 per 1M blended tokens.
Gemini 2.5 Flash: $0.85 per 1M blended tokens.
Claude Opus 5: closed weights.
Gemini 2.5 Flash: closed weights.
General LLM: As of Oct 14, 2026, Claude Opus 5 leads Gemini 2.5 Flash in General LLM at #11 against #108.
Reasoning: As of Oct 14, 2026, Claude Opus 5 leads Gemini 2.5 Flash in Reasoning at #9 against #114.
Long context: As of Oct 14, 2026, Claude Opus 5 leads Gemini 2.5 Flash in Long context at #9 against #104.
Factuality: As of Oct 14, 2026, Claude Opus 5 leads Gemini 2.5 Flash in Factuality at #4 against #72.
Claude Opus 5 · Gemini 2.5 Flash
Claude Opus 5 or Gemini 2.5 Flash?
As of Oct 14, 2026, Claude Opus 5 leads Gemini 2.5 Flash in 4 of 4 shared categories: General LLM, Reasoning, Long context, and Factuality.
Claude Opus 5 or Gemini 2.5 Flash for General LLM?
As of Oct 14, 2026, Claude Opus 5 leads Gemini 2.5 Flash in General LLM at #11 against #108.
Claude Opus 5 or Gemini 2.5 Flash for Reasoning?
As of Oct 14, 2026, Claude Opus 5 leads Gemini 2.5 Flash in Reasoning at #9 against #114.
Claude Opus 5 or Gemini 2.5 Flash for Long context?
As of Oct 14, 2026, Claude Opus 5 leads Gemini 2.5 Flash in Long context at #9 against #104.