GPT-5.5

Retired

OpenAI positioned GPT-5.5 as its smartest model for agentic coding, computer use, knowledge work, and scientific research, rolling out first in ChatGPT and Codex with API availability coming soon.

Retired

The first-party endpoint is retired. Partner-channel availability is tracked separately.

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Input, output, and cached rates with source and verification time, plus same-workload cost examples.

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Modality:LLM

Release:Apr 23, 2026

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Latest changes

OpenAI introduced GPT-5.5 for ChatGPT, Codex, and upcoming API access

Apr 23, 2026• Critical Update

OpenAI introduced GPT-5.5 on April 23, 2026 as its smartest model for agentic coding, computer use, knowledge work, and research. GPT-5.5 is rolling out to Plus, Pro, Business, and Enterprise users in ChatGPT and Codex, while GPT-5.5 Pro is rolling out to Pro, Business, and Enterprise users in ChatGPT. OpenAI says both GPT-5.5 and GPT-5.5 Pro will come to the API very soon, with pricing listed at $5 input / $0.50 cached input / $30 output per 1M tokens for GPT-5.5 and $30 input / $180 output per 1M tokens for GPT-5.5 Pro.