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GPT-5.5 tops benchmarks but still hallucinates frequently at a 20 percent higher API cost

THE DECODER / 4/26/2026

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Key Points

  • GPT-5.5 has returned OpenAI to the top position on AI benchmarks, improving overall benchmark performance.
  • Despite its gains, GPT-5.5 still hallucinates frequently, indicating persistent reliability issues.
  • OpenAI’s API cost for GPT-5.5 is about 20% higher, which affects total cost of ownership for developers.
  • The report concludes that GPT-5.5 remains the strongest value proposition among proprietary models despite the higher price and ongoing hallucinations.

GPT-5.5 pushes OpenAI back to the top of the AI benchmarks. The price went up, but it still looks like the best bang for your buck among proprietary models.

The article GPT-5.5 tops benchmarks but still hallucinates frequently at a 20 percent higher API cost appeared first on The Decoder.

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