Claude Opus 4.8: "a modest but tangible improvement"

Anthropic released Claude Opus 4.8 with modest gains, stronger honesty, and developer-facing prompt improvements.

Anthropic shipped Claude Opus 4.8, and Simon Willison highlights the unusually restrained release language: a “modest but tangible improvement.” The model keeps most Opus 4.7 pricing and specs, while evaluations suggest it is more likely to flag uncertainty and less likely to ignore flaws in code it wrote. Developer-relevant changes include mid-conversation system messages and a lower prompt-cache minimum of 1,024 tokens.

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