
GPT-5.5 Tops Benchmarks, Costs 2x API Price, Still Hallucinates
OpenAI launched GPT-5.5, an agentic model that tops Terminal-Bench 2.0 at 82.7% and surpasses Claude Opus 4.7 and Gemini 3.1 Pro on coding and math. However, independent testing shows higher hallucination rates and effective API costs 20% above GPT-5.4 despite doubled token prices.





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