OpenAI launches GPT-5.5 with 1.1M context
- OpenAI said on April 23 it is rolling out GPT-5.5 in ChatGPT and Codex, with API access for GPT-5.5 and GPT-5.5 Pro added April 24. - OpenAI says GPT-5.5 reaches 82.7% on Terminal-Bench 2.0, matches GPT-5.4 latency, and ships with a 1.05 million-token context window in the API. - GPT-5.5 follows GPT-5.4 by seven weeks, pushing OpenAI’s agent-focused lineup toward longer, tool-using workflows (openai.com)
OpenAI rolled out GPT-5.5 on April 23, adding the model to ChatGPT and Codex before expanding it to the API a day later. (openai.com) (help.openai.com) A context window is the amount of text a model can keep “in mind” in one session, like the size of its working desk. OpenAI lists GPT-5.5 at 1.05 million tokens of context in the API, alongside a 128,000-token maximum output. (openai.com) OpenAI says GPT-5.5 is built for coding, online research, data analysis, documents, spreadsheets, and software tasks that stretch across multiple tools. In ChatGPT, GPT-5.5 Thinking is available on eligible paid plans, while GPT-5.5 Pro is limited to Pro, Business, Enterprise, and Edu. (openai.com) (help.openai.com) The company’s headline pitch is that the model can take “messy, multi-part” requests and carry more of the work itself. OpenAI says GPT-5.5 asks for less guidance, uses tools more effectively, and keeps going until a task is done. (openai.com 1) (openai.com 2) On OpenAI’s benchmark table, GPT-5.5 scores 82.7% on Terminal-Bench 2.0, up from 75.1% for GPT-5.4. OpenAI also reports 78.7% on OSWorld-Verified and 84.4% on BrowseComp, with GPT-5.5 matching GPT-5.4 per-token latency in real-world serving. (openai.com) The release lands seven weeks after GPT-5.4, which OpenAI introduced on March 5 with a 1 million-token context window and native computer-use capabilities in Codex and the API. GPT-5.5 keeps that agent-focused direction but pushes performance higher on coding, browsing, and long-horizon work. (openai.com 1) (openai.com 2) OpenAI also raised the API price versus GPT-5.4. Its API page lists GPT-5.5 at $5 per 1 million input tokens and $30 per 1 million output tokens, compared with $2.50 and $15 for GPT-5.4. (openai.com) For safety, OpenAI says it ran GPT-5.5 through its Preparedness Framework, added red-teaming for cybersecurity and biology risks, and gathered feedback from nearly 200 early-access partners. The system card was updated on April 24 to add safeguards for API deployment of GPT-5.5 and GPT-5.5 Pro. (openai.com 1) (openai.com 2) The result is a model OpenAI is positioning less as a chatbot upgrade than as software for longer jobs. The company’s release page calls GPT-5.5 “the next step toward a new way of getting work done on a computer.” (openai.com)
