OpenAI released GPT-5.5 Instant on May 10, 2026, extending the GPT-5.5 lineup with a variant tuned for speed and low latency rather than maximum context depth. The release sits alongside the previously launched GPT-5.5 (1M context window, $5/1M input tokens) and the limited-preview GPT-5.5-Cyber security-focused model, giving the family three distinct deployment profiles. For developers, GPT-5.5 Instant targets use cases where response time is a primary constraint — real-time assistants, interactive coding tools, and latency-sensitive API integrations. The Instant variant broadens OpenAI's competitive positioning against low-latency alternatives and gives teams a reason to stay within the GPT-5.5 ecosystem rather than routing fast-path requests to smaller models from other providers.