Claude 3 Opus

Anthropic's most capable model in the Claude 3 family, setting new standards for AI performance. Outperforms peers on most common evaluation benchmarks including graduate-level reasoning (GPQA), undergraduate knowledge (MMLU), and basic math (GSM8K). Achieved near-perfect 99% accuracy on 'Needle in a Haystack' recall evaluation. Features sophisticated vision capabilities for analyzing photos, charts, and technical diagrams. 200K context window expandable to 1M for specific use cases. Note: Deprecated as of January 2026, scheduled for retirement January 5, 2026 - migrate to Claude Opus 4.1.