We call on all AI labs to immediately pause for at least 6 months the training of AI systems more powerful than GPT-4. AI systems with human-competitive intelligence can pose profound risks to society and humanity. Powerful AI systems should be developed only once we are confident that their effects will be positive and their risks will be manageable. Therefore, we call on all AI labs to immediately pause for at least 6 months the training of AI systems more powerful than GPT-4. This pause should be public and verifiable, and include all key actors.