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Models2026-07-10 · source-backed
Elvis Saravia's roundup characterizes it as making plans, driving browsers and terminals, and finishing multi-step tasks where prior Sonnets stopped short, notably verifying its own output unprompted. Anthropic puts it near Opus 4.8 on reasoning, tool use, coding, and knowledge work at a lower price, with introductory pricing of $2/$10 per 1M through August 31. Default on Free and Pro. Test the self-checking behavior specifically. If it holds, it changes how much verification scaffolding your agent loop actually needs, which is the single biggest source of harness complexity.
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Anthropic released Claude Code / Shared entities / Shared topic / Earlier coverage
Linked by a graph relationship (Anthropic released Claude Code); both cover Anthropic, August, Free, Sonnet; overlapping topics (agent, august, behavior, sonnet).
Opus built by Anthropic / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Opus built by Anthropic); both cover Anthropic, Opus, Sonnet; overlapping topics (actually, anthropic, sonnet).
Linked by a graph relationship (Opus built by Anthropic); both cover Anthropic, Opus, Sonnet; overlapping topics (agent, anthropic, output).