/ Models Index / Claude Opus 4.6

Claude Opus 4.6

Frontier · Anthropic · Anthropic · Released Apr 2026
A

Excellent (A) — Capability Grade

Claude Opus 4.6 is Anthropic's flagship frontier model and the highest-rated model in the Q2 2026 Index. State-of-the-art performance on SWE-Bench Verified, GPQA-Diamond, and tool-use benchmarks (TAU-bench). Reasoning is industry-leading for long-context, multi-step agentic workflows. Constitutional AI alignment training produces strongest documented refusal-of-misuse behavior in the rated cohort. Premium-priced in the API category.

94
Composite / 100
/ Subscore Breakdown · 6 Capability Dimensions

Where this grade comes from.

General Reasoning
A
Code Generation
A
Math & STEM
A
Tool Use & Agency
A
Multimodal
A-
Safety & Alignment
A
/ Key Events & Disclosures

Release timeline & positioning.

  • Released Apr 2026
  • Highest SWE-Bench Verified score (Q2 2026)
  • 500K context window
  • Constitutional AI training
  • API-only deployment

/ Best for

Enterprise agentic workflows requiring long-context reasoning, code generation at scale, and the strongest documented safety profile.

/ Watch out for

Premium API pricing (~$15-$75 per 1M tokens output) reflects flagship positioning. For volume-cost-sensitive workloads, evaluate Claude Sonnet 4.6 or Haiku 4.5.