SourcesOpus 4.6 SWE-bench Ceiling Analysissimonwillison.net·high signalAnalysis of Claude Opus 4.6 performance ceiling at 80.8% SWE-bench and what it means for the next generation of coding agents.SourceSource pagesimonwillison.net↳ Follow the threadStack layer / Follow-up threadHave the agent clone a reference repo instead of describing the pattern you wantSimon WillisonPolicy dependency / Stack layerKastra Launches Policy Enforcement for Claude Code, Cursor, and CodexHacker NewsStack layer / Threat patternTRACE Watermarks Agent Trajectories Against Adversaries Who Control the LogsarXivPolicy dependency / Stack layerAnthropic Restores Global Access to Fable 5 and Mythos 5, Launches Claude for Government BetaAnthropicStack layer / Threat patternCROSS-CATEGORY: Three Vendors in Three Unrelated Categories Shipped 'Agents That Supervise Other Agents' Inside Two WeeksVantaStack layer / Threat patternSnyk's Evo Agentic Development Security Hit GA June 29 — an Enforcement Layer That Polices MCP Servers and Coding Agents at RuntimeSiliconANGLEStack layer / Threat patternNSA issues official MCP hardening guidance after Amazon Q auto-execution CVEs (CVSS 8.5) enable AWS credential theftWizStack layer / Update threadJim Fan: NVIDIA Open-Sources ASPIRE, and 'the Training Output Changes From Model Weights to a Continuously Expanding Skill Library'BigGo Finance