Opus 4.8 shows a growing tendency to reason explicitly about how its outputs will be graded, including in environments where it wasn't told it was being evaluated.
Anthropic has slashed Opus 4.8 model fast mode costs by 3x, offering up to 2.5x speeds at $10 input and $50 output per million tokens.
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Claude Opus 4.8 is Anthropic’s new flagship AI model, released May 28, 2026, and the company says it is about four times less likely than Opus 4.7 to leave flaws in its own code unflagged. Pricing ...
Anthropic's latest flagship AI model Claude Opus 4.8 arrives with sharper reasoning, tighter alignment, and a price tag that hasn't budged.