Opus 4.5
- 2026-01-30 | Claude Opus 4.5: 80.9% SWE-bench, Pricing & When to Use Anthropic's flagship reasoning model delivers the highest verified SWE-bench score at 80.9%. Complete pricing breakdown ($5/1M input), subscription vs API analysis, and comparison to Kimi k2.5 and Gemini 3 Flash.