GPT 6 Astra vs Claude Fable 5.1 Compared

A head-to-head testing comparison examines how these two flagship AI models perform in real-world scenarios.

Best Design Skill for Claude Code

A new tool called Impeccable 4.0 is introduced as a top design skill add-on for Claude Code.

Organization Policy Diagnostics Added

Claude Code now shows why an organization's policy failed to load, plus new settings to increase command and background-task output limits.

Claude Fable and Mythos 5.1 Launch

Anthropic has released Claude Fable 5.1 and Claude Mythos 5.1, positioned as its most advanced models yet for coding and knowledge work.

--agents

Define custom subagents dynamically via JSON. Accepts the fields listed for CLI-defined subagents. Claude Code validates the JSON at startup and exits on an invalid value; see Invalid --agents configuration for the message and for the flags and environment variable that skip the validation. Validation requires Claude Code v2.1.242 or later

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