Claude Opus 5.5 vs Longcat Flash Chat
As of Oct 15, 2026, Claude Opus 5.5 leads Longcat Flash Chat in 3 of 3 shared categories: General LLM, Reasoning, and Long context.
Claude Opus 5.5
Yes. SOTA in Reasoning (tied), Coding (tied), Coding › Agentic (tied), Coding › Web dev, Long context (tied), and Factuality (tied).
Longcat Flash Chat
#139 Best current rank: #139 in Reasoning, as of Oct 15, 2026.
| Category | Claude Opus 5.5 | Longcat Flash Chat |
|---|---|---|
| General LLM | #2 · Near-SOTA · General LLM Margin 1.0638297872340416 LMArena leaderboard dataset · Oct 13, 2026 | #150 · #150 in General LLM Margin 79.7872340425532 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | #139 · #139 in Reasoning Margin 74.46808510638297 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 | #31 · #31 in Science Margin — Epoch AI benchmarking hub · Sep 22, 2026 | — |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 |
| 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 | #174 · #174 in Long context Margin 92.55319148936171 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #4 · Near-SOTA · Vision Margin 13.15789473684211 Epoch AI benchmarking hub · Sep 22, 2026 | — |
| Factuality | #1 · Co-SOTA · Factuality Margin 0 LMArena leaderboard dataset · Oct 13, 2026 | — |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | — |
Claude Opus 5.5: $8.000000000000002 per 1M blended tokens.
Longcat Flash Chat: price per 1M tokens is unset in the catalog.
Claude Opus 5.5: closed weights.
Longcat Flash Chat: open weights.
General LLM: As of Oct 15, 2026, Claude Opus 5.5 leads Longcat Flash Chat in General LLM at #2 against #150.
Reasoning: As of Oct 15, 2026, Claude Opus 5.5 leads Longcat Flash Chat in Reasoning at #1 against #139.
Long context: As of Oct 15, 2026, Claude Opus 5.5 leads Longcat Flash Chat in Long context at #1 against #174.
Claude Opus 5.5 · Longcat Flash Chat
Claude Opus 5.5 or Longcat Flash Chat?
As of Oct 15, 2026, Claude Opus 5.5 leads Longcat Flash Chat in 3 of 3 shared categories: General LLM, Reasoning, and Long context.
Claude Opus 5.5 or Longcat Flash Chat for General LLM?
As of Oct 15, 2026, Claude Opus 5.5 leads Longcat Flash Chat in General LLM at #2 against #150.
Claude Opus 5.5 or Longcat Flash Chat for Reasoning?
As of Oct 15, 2026, Claude Opus 5.5 leads Longcat Flash Chat in Reasoning at #1 against #139.
Claude Opus 5.5 or Longcat Flash Chat for Long context?
As of Oct 15, 2026, Claude Opus 5.5 leads Longcat Flash Chat in Long context at #1 against #174.