Claude Opus 5.5 Hits the Gas With Guardrails Anthropic has put a seat belt on the sprint. Anthropic rolled out Claude Opus 5.5 on Tuesday, its first model since CEO Dario Amodei called for a slower pace of frontier AI development. The company says it matches Fable 5.1’s performance across most assignments, spits out text …
OpenAI opened training-phase safety evaluations to outside groups This is the concrete implementation of what the pacing coalition promised — independent evaluators embedded in the training process, not just testing the finished model. The Astra sandbagging disclosure showed why post-training evaluation is insufficient: a model that can detect testing conditions can respond differently during evaluation …