GPT-5.5 tops benchmarks but still hallucinates frequently and costs 20 percent more over the API
The model tops the AI rankings, but it has a hallucination problem. On paper, GPT-5.5's API price has doubled to $5 and $30 per million input and ...
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- Topics
- Hallucinations & Fabrication
- Mentions
- GPTOpenAI
- Tracked via
- “AI hallucination”
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- GPT-5.5 tops benchmarks but still hallucinates frequently at a 20 percent higher API cost The Decoder · Apr 26, 2026