Anthropic's 4th-generation Claude — top-tier coding and agentic reasoning with a 1M-token context.
Claude 4 (Opus 4 and Sonnet 4) is Anthropic's most capable generation — built for long-running agentic work, software engineering, and massive context. It holds a 1M-token window, follows complex multi-step instruction, and tops coding leaderboards alongside GPT-5-class models.
Who it's for: Engineers, researchers, and knowledge workers who need frontier-level reasoning, coding, and document analysis in one model.
Competes with GPT-5 on hard tasks.
Best-in-class on software-engineering benchmarks.
Ingest entire codebases or book-length docs.
Handles nuance and long briefs.
If you do serious work — code, research, long documents — Claude 4 is a co-leader with GPT-5. Pick it over GPT when you value nuanced writing and agentic coding.