Anthropic shipped Claude Opus 4.8 on May 28 without making much noise about the parts that actually matter to developers. The benchmarks are fine — SWE-Bench Pro up nearly five points over Opus 4.7, code honesty dramatically improved — but the reason to care is three quiet API changes that affect what your existing integrations cost and what they can now do. Mid-Conversation System Messages Change the Agentic Loop The most significant new capability in Claude Opus 4.8 is mid-conversation system messages. On Opus 4.8, you can insert a message with "role": "system" directly into the messages array, after a […]
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