gpt-5.5 is now on API Yi: reasoning.effort adds xhigh (five tiers: none/low/medium/high/xhigh), SWE-bench Verified 88.7%, 60% fewer hallucinations vs. GPT-5.4, 1.05M context + 128K output. Pricing matches OpenAI’s official rate: $5 in / $30 out / $0.50 cached input per 1M tokens (2× GPT-5.4’s per-token price).
📖 Details: /en/news/gpt-5-5-launch
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