Claude Sonnet 5 vs Claude Sonnet 5.5
As of Oct 15, 2026, Claude Sonnet 5 leads Claude Sonnet 5.5 in 0 of 8 shared categories.
Claude Sonnet 5
#19 Best current rank: #19 in Coding, as of Oct 15, 2026.
Claude Sonnet 5.5
Yes. SOTA in Coding (tied), Coding › Agentic (tied), and Vision (tied).
| Category | Claude Sonnet 5 | Claude Sonnet 5.5 |
|---|---|---|
| General LLM | #50 · #50 in General LLM Margin 26.59574468085107 LMArena leaderboard dataset · Oct 13, 2026 | #29 · #29 in General LLM Margin 15.425531914893611 LMArena leaderboard dataset · Oct 13, 2026 |
| Reasoning | #40 · #40 in Reasoning Margin 21.808510638297875 LMArena leaderboard dataset · Oct 13, 2026 | #18 · #18 in Reasoning Margin 10.106382978723403 LMArena leaderboard dataset · Oct 13, 2026 |
| Math | #— · Not enough data Margin — LMArena leaderboard dataset · Oct 13, 2026 | #4 · #4 in Math Margin 6.666666666666671 Epoch AI benchmarking hub · Sep 28, 2026 |
| Science | #32 · #32 in Science Margin — Epoch AI benchmarking hub · Jun 30, 2026 | #3 · #3 in Science Margin — Epoch AI benchmarking hub · Sep 28, 2026 |
| Coding | #19 · #19 in Coding Margin 95.45454545454545 Terminal-Bench Harbor Hub · Oct 6, 2026 | #1 · Co-SOTA · Coding Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Agentic | #19 · #19 in Coding › Agentic Margin 95.45454545454545 Terminal-Bench Harbor Hub · Oct 6, 2026 | #1 · Co-SOTA · Coding › Agentic Margin 0 Terminal-Bench Harbor Hub · Oct 6, 2026 |
| Coding › Web dev | #40 · #40 in Coding › Web dev Margin 31.200000000000003 LMArena leaderboard dataset · Oct 13, 2026 | #3 · Near-SOTA · Coding › Web dev Margin 1.5999999999999943 LMArena leaderboard dataset · Oct 13, 2026 |
| Long context | #36 · #36 in Long context Margin 19.148936170212764 LMArena leaderboard dataset · Oct 13, 2026 | #11 · #11 in Long context Margin 5.851063829787236 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 | #56 · #56 in Factuality Margin 33.13953488372093 LMArena leaderboard dataset · Oct 13, 2026 | #17 · #17 in Factuality Margin 10.465116279069761 LMArena leaderboard dataset · Oct 13, 2026 |
Claude Sonnet 5: $4.000000000000001 per 1M blended tokens.
Claude Sonnet 5.5: $4.000000000000001 per 1M blended tokens.
Claude Sonnet 5: closed weights.
Claude Sonnet 5.5: closed weights.
General LLM: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 5 in General LLM at #29 against #50.
Reasoning: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 5 in Reasoning at #18 against #40.
Science: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 5 in Science at #3 against #32.
Coding: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 5 in Coding at #1 against #19.
Coding › Agentic: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 5 in Coding › Agentic at #1 against #19.
Coding › Web dev: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 5 in Coding › Web dev at #3 against #40.
Long context: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 5 in Long context at #11 against #36.
Factuality: As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 5 in Factuality at #17 against #56.
Claude Sonnet 5 · Claude Sonnet 5.5
Claude Sonnet 5 or Claude Sonnet 5.5?
As of Oct 15, 2026, Claude Sonnet 5 leads Claude Sonnet 5.5 in 0 of 8 shared categories.
Claude Sonnet 5 or Claude Sonnet 5.5 for General LLM?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 5 in General LLM at #29 against #50.
Claude Sonnet 5 or Claude Sonnet 5.5 for Reasoning?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 5 in Reasoning at #18 against #40.
Claude Sonnet 5 or Claude Sonnet 5.5 for Science?
As of Oct 15, 2026, Claude Sonnet 5.5 leads Claude Sonnet 5 in Science at #3 against #32.