Claude 4 (Opus 4 / Sonnet 4)
AI Model
Coding
Prior generation
Hybrid reasoning and hours-long agentic coding sessions.
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Claude 4 (May 2025) fused instant responses with extended thinking in one model and pushed agentic coding — Opus 4 could sustain multi-hour autonomous engineering tasks. Anthropic shipped it under its ASL-3 safety standard, the first activation of that deployment tier.
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Sources
Record reviewed as of 2026-01-15 — see Methodology.