OpenAI GPT-5.5 Agentic Model Takes Over ChatGPT, Cuts Tokens but Raises API Costs

OpenAI released the GPT-5.5 agentic model on April 23, 2026, replacing GPT-5.4 as the default in ChatGPT for Plus, Pro, Business, and Enterprise users. GPT-5.5 is positioned as an “agentic” system that can complete messy, multi-step real work with less step-by-step human guidance. A GPT-5.5 Pro variant targets longer-horizon, higher-accuracy workloads. Key performance claims in the latest rollout include 82.7% on Terminal-Bench 2.0, 84.9% on GDPval across 44 knowledge-work occupations, and 78.7% on OSWorld-Verified for autonomous operation in real computer environments. OpenAI says the GPT-5.5 agentic model keeps the same per-token latency as GPT-5.4, but uses fewer tokens for the same tasks, reframing quality from “chat” metrics to execution outcomes. Pricing is built for agent deployments: standard GPT-5.5 is $5 per million input tokens and $30 per million output tokens, while GPT-5.5 Pro is expected at $30/$180 per million input/output. OpenAI also compares competitively with Anthropic’s Claude Mythos Preview on Terminal-Bench 2.0 and says GPT-5.5 stays within its critical cybersecurity risk threshold (“High”), requiring enhanced safeguards. For crypto traders, the direct impact on coin prices is likely limited. However, the push toward AI agents for enterprise workflows can shift sentiment around AI infrastructure and the broader “digital economy” narrative—often a second-order driver rather than an immediate catalyst.