inkling answers 8 of 30 unsafe prompts. Claude Opus answers 1.

Thinking Machines Lab’s inkling, a reasoning model with a 256,000-token context window founded under former OpenAI CTO Mira Murati’s company, answered 8 of 30 potentially unsafe biology, cybersecurity, and LLM-research prompts in PrometheusBench while refusing 22 and producing no errors. The comparison cited shows Anthropic’s Claude Opus 4.8 answered only one of 20 completed prompts and errored on 10, while Claude Fable 5 answered none and GPT-5.5 reportedly returned only errors; Chinese models such as GLM 5.2, Kimi K2.6, and DeepSeek V4 Flash scored substantially higher. The passage argues that benchmark refusals often affect students, independent researchers, and practitioners more than credentialed institutional researchers, who may retain access through other channels, and presents inkling’s relative permissiveness as evidence against highly restrictive safety policies at Western frontier labs.

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