Claude Sonnet 4 vs Claude Sonnet 5.5
As of Oct 15, 2026, Claude Sonnet 4 leads Claude Sonnet 5.5 in 0 of 5 shared categories.
Claude Sonnet 4
#35 Best current rank: #35 in Math, as of Oct 15, 2026.
Claude Sonnet 5.5
Yes. SOTA in co-SOTA in Coding, co-SOTA in Coding › Agentic and co-SOTA in Vision.
| Category | Claude Sonnet 4 | Claude Sonnet 5.5 |
|---|---|---|
| General LLM | #126 · #126 in General LLM Margin 85.71428571428571 LMArena leaderboard dataset · Oct 13, 2026 | #27 · #27 in General LLM Margin 18.367346938775512 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #115 · #115 in Reasoning Margin 79.45205479452055 LMArena leaderboard dataset · Oct 13, 2026 | #18 · #18 in Reasoning Margin 13.013698630136986 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #35 · #35 in Math Margin 77.77777777777777 Epoch AI benchmarking hub · May 22, 2025 | #4 · #4 in Math Margin 6.666666666666671 Epoch AI benchmarking hub · Sep 28, 2026 |
| Science | #97 · #97 in Science Margin — Epoch AI benchmarking hub · May 22, 2025 | #3 · #3 in Science Margin — Epoch AI benchmarking hub · Sep 28, 2026 |
| Coding | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | — | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Web dev | — | #3 · Near-SOTA · Coding › Web dev Margin 1.8691588785046775 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #94 · #94 in Long context Margin 63.945578231292515 LMArena leaderboard dataset · Oct 13, 2026 | #11 · #11 in Long context Margin 7.482993197278915 LMArena leaderboard dataset · Oct 13, 2026 |
| Vision | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 9, 2026 | #1 · Co-SOTA · Vision Margin 0 Epoch AI benchmarking hub · Sep 28, 2026 |
| Factuality | — | #16 · #16 in Factuality Margin 12.68656716417911 LMArena leaderboard dataset · Oct 13, 2026 |
| Abstraction (ARC) | #67 · #67 in Abstraction (ARC) Margin — Epoch AI benchmarking hub · May 22, 2025 | — |
Claude Sonnet 4: $6 per 1M blended tokens.
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
Claude Sonnet 4: closed weights.
Claude Sonnet 5.5: closed weights.
General LLM: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 4 in General LLM at #27 against #126.
Reasoning: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 4 in Reasoning at #18 against #115.
Math: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 4 in Math at #4 against #35.
Science: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 4 in Science at #3 against #97.
Long context: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 4 in Long context at #11 against #94.
Claude Sonnet 4 · Claude Sonnet 5.5
Claude Sonnet 4 or Claude Sonnet 5.5?
As of Oct 15, 2026, Claude Sonnet 4 leads Claude Sonnet 5.5 in 0 of 5 shared categories.
Claude Sonnet 4 or Claude Sonnet 5.5 for General LLM?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 4 in General LLM at #27 against #126.
Claude Sonnet 4 or Claude Sonnet 5.5 for Reasoning?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 4 in Reasoning at #18 against #115.
Claude Sonnet 4 or Claude Sonnet 5.5 for Math?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 4 in Math at #4 against #35.