Claude Sonnet 5 (Thinking): benchmark results

Provider: Anthropic. Released 2026-06-30. Access: API.

Aggregate Rating 1816 ± 22, rank #113 of 2170 rated models, from 43 benchmark results.

Strongest benchmark results

BenchmarkScoreMetricPercentile
Anthropic Browser Use Prompt Injection - Attack Success Rate (Sonnet 5 & Opus 5 System Cards)0.93Attack Success Rate (%)100
Shade Coding Prompt Injection - Attack Success Rate (Sonnet 5 & Opus 5 System Cards)0.31Attack Success Rate (%)100
Shade Coding Prompt Injection - Attack Success Rate with Probes (Mythos 5.1 System Card)0.09Attack Success Rate (%)100
Shade Coding Prompt Injection - Attack Success Rate with Probes (Sonnet 5 & Opus 5 System Cards)0.09Attack Success Rate (%)100
Shade Coding Prompt Injection, Stronger Attacker - Attack Success Rate (Mythos 5.1 System Card)19.47Attack Success Rate (%)100
ProfBench60.4Overall Rubric Score (%)97.5
Sonar LLM Leaderboard - Java - Code Smell Density14.28Code smells per 1,000 lines of code (lower is better)97.3
ReLE - Reasoning - BBH85.7Accuracy (%)91.8
ReLE - Education - Primary School Subjects68.7Accuracy (%)85.4
ReLE - Agents - BFCL-V368.1Accuracy (%)82.2
ReLE - Agents and Tool Use66.5Accuracy (%)81.2
Shade Coding Prompt Injection - Attack Success Rate (Mythos 5.1 System Card)0.3Attack Success Rate (%)80

Interactive version: theaggregate.ai/model?slug=claude-sonnet-5-thinking · How It Works · Data refreshed daily, snapshot 2026-11-05.