Claude Opus 5: What Anthropic Documented About Its Own Model
Anthropic shipped a prompting guide and a 194-page System Card with Claude Opus 5. Between them: over-verification, scope drift and a higher hallucination rate.
Anthropic shipped a prompting guide and a 194-page System Card with Claude Opus 5. Between them: over-verification, scope drift and a higher hallucination rate.
Anthropic released Claude Opus 5 on 24 July 2026 with a 1M-token context. It costs half of Fable 5 and the same as Opus 4.8, so it is not a price cut.
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