GPT-5.1 does NOT use em dashes anymore—in case it is specified in custom instructions! Instruction following is also getting much better in comparison to GPT-5.
GPT-5.1 Drops Em Dashes on Command
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By
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GPT-5.1 does NOT use em dashes anymore—in case it is specified in custom instructions! Instruction following is also getting much better in comparison to GPT-5.