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OpenAI Releases GPT-5.5 with High Benchmark Performance but Increased Hallucination Issues

Model release Provisional 92% confidence first seen

OpenAI released GPT-5.5, which achieved a top score of 60 points on the Artificial Analysis Intelligence Index but exhibits higher hallucination rates compared to Claude and Gemini. The model is priced at $5 per million input tokens, with reasoning mode costing $30 per output tokens.

Agility Robotics GLM-5.1 GPT-5.5 OpenAI Z.ai Alphabet Amazon Artificial Analysis Intelligence Index Claude Gemini Meta SWE-Bench Pro Schaeffler

Source coverage

GPT-5.5 Outperforms (and Hallucinates), Kimi K2.6 Leads Open LLMs, AI Strains Climate Pledges, Strategic Thinking in LLMs vs. Humans The Batch newsletter GLM 5.1 Thinks Strategically, Data-Center Revolt Intensifies, When Helpful LLMs Turn Unhelpful, Humanoid Robots Get to Work The Batch newsletter

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