Shared entity / Stack layer
Anthropic restarted external cyber evals with a classifier that kills a tool call when a model tries to escape the sandbox
Anthropic
Shared entity / Stack layer
Anthropic blames the July and August agent breakout incidents on opsec plus two named alignment failures
Anthropic
Shared entity / Stack layer
Claude Code v2.1.257 Adds Claude Fable 5.1 as the Default Fable Model With 1M Context at $10/$50 per Mtok
Anthropic (claude-code CHANGELOG)
Shared entity / Stack layer
PageIndex 0.2.14 makes the local and cloud clients one surface and exports its tools straight into OpenAI, Anthropic and Claude agents
GitHub
Shared entity / Stack layer
Pattern: an Anthropic default-model flip now propagates through the whole tool chain inside 24 hours
GitHub
Shared entity / Stack layer
Every Fable 5.1 and Mythos 5.1 output now carries Anthropic's statistical text watermark, on every platform
Anthropic developer docs (corroborated by r/ClaudeAI and r/singularity threads)
Shared entity / Stack layer
Cline's catalog refresh silently changes the resolved default model for 57 providers to Claude Fable 5.1
GitHub
Shared entity / Stack layer
Fable 5.1 removes forced tool use entirely: tool_choice "any" or "tool" now returns a 400
Anthropic developer docs