●OPUS48 — The default model on Bedrock, Vertex, and AWS is now Claude Opus 4.8. Opus 4.8 and Haiku 4.5 are also in the Messages API, with prompt caching and extended thinking●STREAM — A Claude Code stability and quality update landed: subagent text over stream-json, stronger permission and hook handling, and better background-agent reporting●FASTEND — Fast mode for Claude Opus 4.7 is removed on July 24. After that, speed: 'fast' returns an error, so migrate to fast mode on Opus 4.8●TEACH — Claude for Teachers is here, giving verified US K-12 educators free premium access, plus curriculum connections aligned to standards in all 50 states and new education connectors●FIX — The update fixes issues across Chrome, Windows, Bedrock, Vertex, hooks, and session recovery, and speeds up terminal rendering●IPO — Bankers are reportedly lining up investor meetings for Anthropic ahead of a possible public listing as soon as October●OPUS48 — The default model on Bedrock, Vertex, and AWS is now Claude Opus 4.8. Opus 4.8 and Haiku 4.5 are also in the Messages API, with prompt caching and extended thinking●STREAM — A Claude Code stability and quality update landed: subagent text over stream-json, stronger permission and hook handling, and better background-agent reporting●FASTEND — Fast mode for Claude Opus 4.7 is removed on July 24. After that, speed: 'fast' returns an error, so migrate to fast mode on Opus 4.8●TEACH — Claude for Teachers is here, giving verified US K-12 educators free premium access, plus curriculum connections aligned to standards in all 50 states and new education connectors●FIX — The update fixes issues across Chrome, Windows, Bedrock, Vertex, hooks, and session recovery, and speeds up terminal rendering●IPO — Bankers are reportedly lining up investor meetings for Anthropic ahead of a possible public listing as soon as October

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Claude API¹ Whisper¹ Japanese¹ voice AI¹ quality measurement¹

⬡ API & SDK/2026-07-11Advanced

When Whisper Wrote 'Thanks for Watching' Into the Silence — Measuring and Killing Japanese Transcription Hallucinations

Whisper inserts phantom boilerplate into silent or noisy segments of Japanese audio. Here is how to measure hallucinations with no_speech_prob and avg_logprob, strip silence with VAD, and have Claude validate what remains — with the implementation and the routine that pulled it back.