Last Week in AI #345 - 5 new models, 9 misalignment incidents, some Dots
Anthropic and OpenAI race to release smarter and cheaper models
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Key points
- Anthropic launches Claude Opus 5.5 with stricter safeguards for cybersecurity
- OpenAI launches GPT-6.1 Sol, says it nearly matches GPT-6 Astra and costs less
- First, Anthropic announced Claude Opus 5.5, which runs 40 percent cheaper than Opus 5 while matching Fable 5.1 on most work, and inheriting Fable-style safeguards: cybersecurity requests get re-routed to the weaker Opus 4.8, and flagged biology requests go to Opus 5.
- OpenAI, meanwhile, extended its GPT-6 generation with updated Sol and Luna models, released 90 minutes after Anthropic’s Opus 5.5 update.
Sources (1)
- [1]Last Week in AI #345 - 5 new models, 9 misalignment incidents, some DotsLast Week in AI · Sep 30, 11:23 AM
Anthropic and OpenAI race to release smarter and cheaper models
- Anthropic launches Claude Opus 5.5 with stricter safeguards for cybersecurity
Extractive summary: sentences quoted from the sources.
Before this
- Sep 30, 2026[AINews] OpenAI DevDay 2026: Dots, 6.1 Sol, Ultrafast, Decisions API, Agents API, Spaces, Marketplace, and 1.2 Billion ChatGPT WAU
- Sep 29, 2026Comfy-Org/ComfyUI v0.38.0
- Sep 29, 2026Sonnet 5.5 is worth a try
- Sep 29, 2026[AINews] AMD buys World Labs for $8.2B, as Atlas solves sparse reconstruction problem for robotics, design and more
- Sep 29, 2026[AINews] Opus 5.5 is good at explainer videos
- Sep 29, 2026Claude Code’s Next Era — Thariq Shihipar, Anthropic
