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GPT-5.1 vs Gemini 3 Pro

Same prompt, two tokenizers: see live token counts, cost per request, and token boundaries side by side.

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Counts include each model's own chat-template overhead.

128 chars

GPT-5.1

OpenAI · 400k context
…tokens

Gemini 3 Pro

Google · 1M context
…tokens

At a glance

  • GPT-5.1: 400k-token context, $1.25/1M input · $10/1M output.
  • Gemini 3 Pro: 1M-token context, $2/1M input · $12/1M output.
  • Token counts differ between models because each vendor trains its own tokenizer vocabulary — the same text can split into more or fewer pieces. Prices as of 2026-07-07.

GPT-5.1 token counter →Gemini 3 Pro token counter →Compare all models →