We've launched mid-conversation system messages. On Claude Opus 4.8, you can send role: "system" messages at non-first positions in the messages array, preserving prompt cache hits when instructions c
We've launched mid-conversation system messages. On Claude Opus 4.8, you can send role: "system" messages at non-first positions in the messages array, preserving prompt cache hits when instructions change during a long-running session. No beta header is required.
출처: Claude Platform 릴리스 노트 (원문 보기)
With adaptive thinking enabled, Claude Opus 4.8 triggers reasoning only when a turn needs it, reducing wasted thinking tokens compared to Claude Opus 4.7 at the same effort level.
The stop_details field on refusal responses is now publicly documented; it returns a category (cyber, bio, or null) and a human-readable explanation, so your application can route different classes of
On the Claude API, you are no longer billed for a request when it returns stop_reason: "refusal" without Claude having generated any output. See Streaming refusals for detecting and handling refusals.
The advisor tool now supports a max_tokens parameter to cap the advisor model's output per call, reducing latency and output token cost for workloads that don't need full-length advisor responses. Set
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