PHWhat Is GPT-5.5?
GPT-5.5 is OpenAI's newest and most capable model, described as "a new class of intelligence for real work and powering agents." It's designed to understand complex goals, use tools autonomously, verify its own work, and carry multi-step tasks to completion — a significant shift from a "smart chatbot" to a more autonomous work model.
Key Strengths
GPT-5.5 excels in these areas:
- Agentic coding — Writes, debugs, and iterates code end-to-end
- Online research — Browses and synthesizes information autonomously
- Data analysis — Handles messy, multi-part analytical tasks
- Document & spreadsheet creation — Turns rough input into polished output
- Computer use — Operates software and works across tools
- Scientific research — Early-stage but notably capable
Speed & Efficiency
Despite being a larger and more capable model, GPT-5.5 matches GPT-5.4's per-token latency in real-world serving — meaning it's just as fast while being smarter. It also uses significantly fewer tokens to complete the same Codex tasks, making it more cost-efficient than its predecessor.
Availability
GPT-5.5 launched on April 23, 2026 and is available in both Codex and ᑕᕼᗩTGᑭT. While it is priced higher than GPT-5.4, OpenAI notes that its token efficiency helps offset the cost difference.
Competitive Edge
Benchmarks place GPT-5.5 ahead of Claude Opus 4.7 and Gemini 3.1 Pro in most categories, with only a slight gap in browsing tasks. It also comes with a Bio Bug Bounty program — a red-teaming challenge to find biosafety jailbreaks, with rewards up to $25,000, highlighting OpenAI's continued focus on safety.
Bottom line: GPT-5.5 is OpenAI's most "agentic" model yet — give it a complex task and it plans, acts, checks its work, and delivers, without you needing to hold its hand every step.
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