> ## Documentation Index
> Fetch the complete documentation index at: https://docs.apiyi.com/llms.txt
> Use this file to discover all available pages before exploring further.

# GPT-5.5 live (OpenAI official relay)

> GPT-5.5 live (OpenAI official relay) — OpenAI's newest frontier model gpt-5.5 on APIYI: reasoning.effort adds xhigh (5 tiers), SWE-bench Verified 88.7%, 60% fewer hallucinations vs. GPT-5.4, official-rate pricing.

**2026/4/25 18:39 (UTC+8)** · New Model · OpenAI

🚀 **GPT-5.5 live (OpenAI official relay)** — OpenAI's newest frontier model `gpt-5.5` is now on APIYI: `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](/en/news/gpt-5-5-launch)

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