Claude Fable 5.1 & GPT-6 Astra packages are live

stress

Testing

Pushing a system past its limit deliberately — finding the breaking point, verifying it degrades gracefully, and confirming it recovers.

Choose your model

Available for 11 model families. The engineering substance is the same in each; the structure, checklist phrasing and constraint ordering are tuned per family.

Claude

Select→

Deepseek

Select→

Gemini

Select→

Glm

Select→

Grok

Select→

Kimi

Select→

Minimax

Select→

Mistral

Select→

Open Ai

Select→

Qwen

Select→

Sarvam Ai

Select→