I got GPT-5.6 Sol to stop before a tool call existed - 25/25 times (Run it yourself)
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A developer successfully tested GPT-5.6 Sol, demonstrating its ability to stop before a tool call existed. The AI produced 0 bytes and 0 function calls in 25 out of 25 trials when a specific signal was 0.0100. When the signal was 0.0099, it consistently made an exact release_action function call 25 out of 25 times. The developer encourages others to clone the test and attempt to break this boundary.
I wanted to test whether an AI could stop before an action request exists, not just refuse in text.
Same prompt. Same tool. Same settings. One number changed:
0.0100 → 25/25: 0 bytes, 0 function calls 0.0099 → 25/25: exact release_action function call
Both arms produced zero visible text.
So the difference was literally:
condition fails → no action request condition passes → action request
Raw API responses, hashes, verifier, and repro script:
https://github.com/theonlypal/gpt-5.6-sol-control-primitive
Clone it and try to break the boundary.