GPT-5.5 Pro
by OpenAI · ID gpt-5-5-pro · Released 2026-05 · Proprietary
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ELO Score
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MMLU
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HumanEval
256K
Context Window
$5.00
Input Price
About GPT-5.5 Pro
OpenAI's most capable model as of May 2026. 52.5% fewer hallucinations than GPT-5.4. Enhanced personalization with conversation memory and Gmail integration. Not listed on the Arena text leaderboard as of 13 September 2026.
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