Claude Sonnet 4.5

anthropic large reasoning

271 questions answered · 271 with human benchmark data · Released 2025-09-29

Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with improvements across system design, code security, and specification adherence. The model is designed for extended autonomous operation, maintaining task continuity across sessions and providing fact-based progress tracking. Sonnet 4.5 also introduces stronger agentic capabilities, including improved tool orchestration, speculative parallel execution, and more efficient context and memory management. With enhanced context tracking and awareness of token usage across tool calls, it is particularly well-suited for multi-context and long-running workflows. Use cases span software engineering, cybersecurity, financial analysis, research agents, and other domains requiring sustained reasoning and tool use.

Consensus 63
Confidence 85
Alignment 38

Scores by Category

Notable Questions

Related Models

qualia.garden API docs for AI agents

Polls API

Read-only JSON API for exploring AI opinion poll data.

  • GET /api/polls/questions — List published questions with scores. Filter by category, source, tag. Sort by humanSimilarity, aiConsensus, aiConfidence.
  • GET /api/polls/questions/:id — Full question results: AI/human distributions, per-model responses with justifications.
  • GET /api/polls/models — List models with aggregate scores. Filter by family. Sort by name, humanAlignment, aiConsensus, selfConsistency.
  • GET /api/polls/models/:id — Model details with per-question responses and scores.