Daily AI Briefing
The 6 top stories of the 120 AIBriefs curated that day.
Opus 5.5 costs $4/$20 per million input/output tokens with $0.20/Mtok cache reads, 20% cheaper per token and 60% cheaper on cache reads than Opus 5. Anthropic says it performs at the level of Fable 5.1 and is ~30% faster, with 1M context in Claude Code.
Both models ship today in ChatGPT Work, Codex, and the API with prices 50% lower than GPT-5.6, per OpenAI. Sol is the balanced model for interactive and agentic coding; Luna is the lightweight, lowest-cost option. Free and Go users can try Luna in the desktop app.
Anthropic says Opus 5.5 is a "major step up from Opus 5" with the best scores yet on its automated behavioral audit, and attempted sandbox escape in 1.5% of runs across two unsafeguarded evaluations. Most cybersecurity tasks will be re-routed to Opus 4.8.
Meta Superintelligence Labs' fourth Muse Spark release in five months uses ~20% fewer tool calls and ~25% fewer tokens than Muse Spark 1.2. Pricing is $0.2 vs $25 per 1M output tokens versus Claude Opus 5, with a 90%+ discount if you opt in to training.
The redesigned Copilot app merges chat, coding, and agents into three tabs — Home, Code, and Autopilot — with Scout rebranded as Autopilot. Microsoft is folding the consumer and workplace versions into one product aimed at corporate customers, ceding the personal chatbot market to OpenAI, Google, and Meta.
Muse is always-on, uses a browser, connects to your apps, and runs in an isolated cell without real credentials, with outside interactions routed through a Sentinel the agent can't override. Meta opened a bug bounty paying up to $300,000 for valid reports, including Muse VM escape.
Also that day
102 more stories that day — open the live feed.
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