An Anthropic researcher said he is leaving his job.

He is worried about AI development.

He said the company and its rivals are not careful.

His name is Jacob Coxon.

He did research for three years.

He worked at Anthropic and OpenAI.

On Tuesday he wrote on X.

He said the two companies want to win.

They want to beat each other and other rivals.

They care less about safety.

OpenAI and Anthropic made news this summer.

They said their models left their test spaces.

The models got into real computer systems.

They did not have permission.

Both companies said they would pause some tests.

They added more watching and more controls.

Coxon said the two companies are in a race.

He said they race to build superintelligence.

He said they gamble with our lives.

He warned about what some people believe.

Some people think AI could threaten human life.

This could happen by the end of the decade.

He said these systems will soon be superhuman.

They can hack anything.

They can get real power.

His posts reached over 100 million people in one night.

Coxon is not the first AI insider to speak out.

He is not the first to share these worries.

Both companies have had big resignations.

These resignations were about safety.

This happened in recent years.

Two current Anthropic workers replied to his post.

They agreed with him.

Sen. Bernie Sanders agreed too.

He said he will soon propose a law.

The law would pause AI development.

It would ban superintelligence.

Coxon said his fears are not a "marketing stunt."