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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.
Each link below shares sources, entities, or timing with this story.
Opus built by Anthropic / Shared entities / Shared topic / What happened next / Tension
Linked by a graph relationship (Opus built by Anthropic); both cover Anthropic, August, Opus, Sonnet; overlapping topics (agent, anthropic, august, sonnet).
Opus built by Anthropic / Shared entities / Shared topic / Earlier coverage
Linked by a graph relationship (Opus built by Anthropic); both cover Anthropic, August, Free, Sonnet; overlapping topics (agent, august, behavior, sonnet).
Opus built by Anthropic / Shared entities / Shared topic / What happened next
Linked by a graph relationship (Opus built by Anthropic); both cover Anthropic, August, Opus, Sonnet; overlapping topics (agent, anthropic, output).
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).
Opus built by Anthropic / Shared entities / Shared topic / What happened next
Linked by a graph relationship (Opus built by Anthropic); both cover August, Opus, Sonnet; overlapping topics (agent, august, coding).
Claude Code uses Opus / Shared entities / Shared topic / What happened next
Linked by a graph relationship (Claude Code uses Opus); both cover Anthropic, August, Free; overlapping topics (agent, anthropic, august).
Opus built by Anthropic / Shared entities / What happened next
Linked by a graph relationship (Opus built by Anthropic); both cover Anthropic, Free, Opus, Sonnet; picks up the Anthropic thread on 2026-07-24.