The gpt-oss models utilize the o200k_harmony tokenizer, which is a Byte Pair Encoding (BPE) tokenizer. This tokenizer extends the o200k tokenizer used for other OpenAI models, such as GPT-4o and OpenAI o4-mini, and includes tokens specifically designed for the harmony chat format. The total number of tokens in this tokenizer is 201,088[1].
This tokenizer plays a crucial role in the models' training and processing capabilities, enabling effective communication in their agentic workflows and enhancing their instruction-following abilities[1].
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