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Screenshot of platform.openai.com/tokenizer showing the sentence "Does ChatGPT, Claude, Anthropic, Llama, Mistral, Gemini, and Perplexity all use Byte-Pair Encoding (BPE)?" tokenizing to 32 tokens / 105 characters. Visible tabs: GPT-5.x & O1/3, GPT-4 & GPT-3.5 (legacy), GPT-3 (legacy) — illustrates that different model generations use different tokenizers. Co-Authored-By: Claude <noreply@anthropic.com>