Claude Opus 5.5 vs Kimi K3.1 Pro
As of Nov 3, 2026, Claude Opus 5.5 leads Kimi K3.1 Pro in 4 of 4 shared categories: General LLM, Science, Coding › Web dev, and Legal.
Claude Opus 5.5
Yes. SOTA in General LLM (tied), Reasoning (tied), Coding (tied), Coding › Agentic (tied), Coding › Web dev, Long context (tied), and Factuality (tied).
Kimi K3.1 Pro
#8 Best current rank: #8 in Coding › Web dev, as of Nov 3, 2026.
| Category | Claude Opus 5.5 | Kimi K3.1 Pro |
|---|---|---|
| General LLM | #1 · Co-SOTA · General LLM Margin 0 LMArena leaderboard dataset · Nov 3, 2026 | #51 · #51 in General LLM Margin 29.575596816976145 Vals AI · Nov 3, 2026 |
| Reasoning | #1 · Co-SOTA · Reasoning Margin 0 LMArena leaderboard dataset · Oct 28, 2026 | — |
| Science | #2 · #2 in Science Margin — Vals AI · Oct 30, 2026 | #15 · #15 in Science Margin — Vals AI · Oct 30, 2026 |
| Coding | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Nov 3, 2026 | — |
| Coding › Agentic | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 23, 2026 | — |
| Coding › Web dev | #1 · SOTA · Coding › Web dev Margin 0 LMArena leaderboard dataset · Oct 28, 2026 | #8 · #8 in Coding › Web dev Margin 5.46875 LMArena leaderboard dataset · Oct 28, 2026 |
| Long context | #1 · Co-SOTA · Long context Margin 0 LMArena leaderboard dataset · Oct 28, 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 28, 2026 | — |
| Abstraction (ARC) | #1 · #1 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · Sep 22, 2026 | — |
| Cybersecurity | #4 · #4 in Cybersecurity Margin 9.375 Vals AI · Oct 27, 2026 | — |
| Finance | #1 · #1 in Finance Margin — Vals AI · Oct 31, 2026 | — |
| Legal | #5 · #5 in Legal Margin — Vals AI · Nov 3, 2026 | #22 · #22 in Legal Margin — Vals AI · Nov 3, 2026 |
Pricing
Claude Opus 5.5: $8 per 1M blended tokens.
Kimi K3.1 Pro: $4 per 1M blended tokens.
Claude Opus 5.5: closed weights.
Kimi K3.1 Pro: closed weights.
Benchmarks side by side
| Benchmark | Claude Opus 5.5 | Kimi K3.1 Pro |
|---|---|---|
| Excel Modeling Benchmark (EMB) | 75.8 | 70.0 |
| Finance Agent | 67.8 | 61.5 |
| Legal Research Bench | 50.5 | 37.5 |
| LMArena WebDev | 1810 | 1695 |
| MysteryMechanism | 49.5 | 26.1 |
| ProofBench | 100 | 91.0 |
| Tax Agent Bench | 45.6 | 24.9 |
| Vals Index | 70.2 | 62.5 |
| Vibe Code Bench | 90.3 | 84.9 |
Latest validated result for each model. Benchmarks where only one model has a result are left out.
Verdict
As of Nov 3, 2026, Claude Opus 5.5 leads Kimi K3.1 Pro in 4 of 4 shared categories: General LLM, Science, Coding › Web dev, and Legal.
General LLM: As of Nov 3, 2026, Claude Opus 5.5 leads Kimi K3.1 Pro in General LLM at #1 against #51.
Science: As of Nov 3, 2026, Claude Opus 5.5 leads Kimi K3.1 Pro in Science at #2 against #15.
Coding › Web dev: As of Nov 3, 2026, Claude Opus 5.5 leads Kimi K3.1 Pro in Coding › Web dev at #1 against #8.
Legal: As of Nov 3, 2026, Claude Opus 5.5 leads Kimi K3.1 Pro in Legal at #5 against #22.
Claude Opus 5.5 · Kimi K3.1 Pro
Claude Opus 5.5 or Kimi K3.1 Pro?
As of Nov 3, 2026, Claude Opus 5.5 leads Kimi K3.1 Pro in 4 of 4 shared categories: General LLM, Science, Coding › Web dev, and Legal.
Claude Opus 5.5 or Kimi K3.1 Pro for General LLM?
As of Nov 3, 2026, Claude Opus 5.5 leads Kimi K3.1 Pro in General LLM at #1 against #51.
Claude Opus 5.5 or Kimi K3.1 Pro for Science?
As of Nov 3, 2026, Claude Opus 5.5 leads Kimi K3.1 Pro in Science at #2 against #15.
Claude Opus 5.5 or Kimi K3.1 Pro for Coding › Web dev?
As of Nov 3, 2026, Claude Opus 5.5 leads Kimi K3.1 Pro in Coding › Web dev at #1 against #8.