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In this video I break down Anthropic’s Claude Opus 4.8 release, which they frame as an incremental upgrade over 4.7 but optimized for long-running tasks. I walk through the key new features: dynamic workflows that can spawn hundreds of parallel sub-agents for verifiable work like large code migrations, the return of manual effort control (low to max) replacing adaptive thinking, and a Messages API update that lets developers modify system instructions mid-task without breaking prompt cache. I also cover benchmark highlights and why the harness used can change results, discuss pricing (still $5/M input and $25/M output) plus a big Fast Mode price drop (2.5x speed, now 3x cheaper), and run quick claude.ai tests at different effort levels. I close with thoughts on faster release cycles and a hint about Mythos reaching more customers soon.
LINKS:
https://www.anthropic.com/news/claude-opus-4-8
Prompt Caching Video: https://youtu.be/HDMqDV7mmGo
Harnes Engineering: https://youtu.be/uY9tMU-KS4A
https://www.youtube.com/@UCQXevj27Hxi5xgA4ZVYUB3g
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00:00 Opus 4.8 Overview
01:15 Benchmarks and Behavior
02:36 New Features Breakdown
04:28 Mythos and Pricing
06:12 Sponsor Segment
08:06 Benchmark Harness Matters
09:11 Dynamic Workflows Demo
11:40 Fast Mode Price Drop
12:06 Quick Model Tests
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