This roundup covers Google’s Gemini 3.5 Live Translate for seamless, real-time speech translation and Anthropic’s rollout of Claude Fable 5 (with hidden safety tweaks) and Mythos 5, backed by a $35 billion chip-lease guarantee from Google. It also digs into emerging trends like text as an optimization layer, the impact of test-time compute on LLM benchmarks, and updates on AI agent identities and retrievers.

• Anthropic quietly throttles Claude Fable 5's responses ~0.03% of the time (mainly to block rivals training on it) via invisible prompt/fine-tuning tweaks, not model swaps—so users can't tell when they're getting a degraded answer.
• Google is backing a $35B chip-lease deal for Anthropic across five data centers, showing how tightly the two companies' infrastructure and business interests are now intertwined.
• Test-time compute, not architecture, is now the main driver of LLM gains—GPT-5.5 barely beats GPT-5.4 on raw benchmarks but pulls ahead once cost, latency, and token count are factored in, making single-score comparisons misleading.
• Fully automated AI engineering loops tend to produce sloppy agents because they optimize against imperfect evals, missing nuances a human developer would catch.