First retrained base model since GPT-4.5, co-designed with NVIDIA GB200/GB300 systems. Significant improvements in agentic benchmarks, particularly Terminal-Bench (82.7%) and long-context retrieval (74.0% on MRCR v2).
OpenAI released GPT-5.5 on April 23, its first retrained base model since GPT-4.5, scoring 82.7% on Terminal-Bench 2.0 versus GPT-5.4's 75.1% and Claude Opus 4.7's 69.4%. API pricing is set at $5 per million input tokens and $30 per million output tokens, exactly double GPT-5.4 rates.
OpenAI's GPT-5.5 scored 93 out of 100 points in a 10-round benchmark test covering summarization, reasoning, coding, and creative tasks. The model lost points primarily for ignoring specific instructions, such as using unauthorized sources when asked to summarize from a single news outlet.
OpenAI released GPT-5.5, which completes tasks at the same difficulty level faster than GPT-5.4 while using significantly fewer tokens. The model is available to ChatGPT Plus, Pro, Business, and Enterprise users, with API access delayed due to required safeguards.
OpenAI released GPT-5.5 on April 23, 2026, seven weeks after GPT-5.4. The model features a 400K context window in Codex and claims improvements in multi-step tasks, agentic coding, and computer use, though at higher pricing than its predecessor.
OpenAI released GPT-5.5 on April 23, 2026, positioning it as a step toward agentic computing and a unified 'superapp' combining ChatGPT, Codex, and browser capabilities. The company claims the model outperforms GPT-5.4, Google's Gemini 3.1 Pro, and Anthropic's Claude Opus 4.5 across multiple benchmarks.
OpenAI has released GPT-5.5, one month after GPT-5.4, claiming improved performance on coding tasks and reduced token usage in its Codex platform. The model rolls out April 24 to paid ChatGPT tiers.
OpenAI released GPT-5.5, its latest AI model with enhanced coding, computer operation, and research capabilities. The model is rolling out to paid subscribers in ChatGPT and Codex, with API access coming soon.