Introducing Claude 4

Anthropic has introduced Claude Opus 4 and Claude Sonnet 4, which it says set new standards for coding, advanced reasoning, and AI agents. Claude Opus 4 leads on SWE-bench at 72.5% and Terminal-bench at 43.2%, and can work continuously for several hours on long-running tasks. Sonnet 4 scores 72.7% on SWE-bench and is available to free users, while Claude Code is now generally available. Pricing is $15/$75 per million tokens (input/output) for Opus 4 and $3/$15 for Sonnet 4.