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OpenAI's GPT-6 Astra can finish some agent tasks in fewer steps while raising the stakes of unsupervised execution. Efficiency is part of the case for Astra; it is not a reason to give the model more authority.

Google kept the introductory token rate identical to its predecessor, but one independent test found that higher reasoning effort and extra agent loops pushed the cost of finished work up by roughly 40 percent.

Anthropic’s Fable 5.1 and Mythos 5.1 share the same underlying model but not the same rules of engagement. That split is more important than another week at the top of a benchmark chart.