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OpenAI Unveils GPT-5.5 with Multi-Step Coding, Strong Benchmarks

4/24/2026

Summary

OpenAI Launches GPT-5.5

OpenAI launched GPT-5.5 on April 23, 2026 for coding, office work and scientific research.
GPT-5.5 scored 75.1% on Terminal Bench 2.0, 78.7% OS World Verified, 84.9% GDPval, 81.8% Cyvergime, 25.0% GeneBench and 80.5% BixBench.
The model adds agentic multi-step task ability and includes OpenAI’s strongest cybersecurity safeguards that limit risky requests.
Jakub Pachocki said it lets researchers focus on higher-level goals, with GPT-5.5 available to ChatGPT and Codex subscribers, an API release planned.

Summary

OpenAI Raises Prices

OpenAI doubled GPT-5.5 prices to $5 per million input and $30 per million output.
The GPT-5.5 Pro tier costs $30 per million input and $180 per million output, ten times the base price.
OpenAI eliminated the “mini” ($0.75) and “nano” ($0.20) GPT-5.4 plans, leaving no cheap GPT-5.5 option.
OpenAI introduced a Fast mode that runs 1.5× faster at 2.5× the price and a cyber-permissive license limiting GPT-5.5 to verified security professionals.

History

Historical Context

OpenAI released GPT-3 in June 2020, a significant advancement in natural language processing with 175 billion parameters, vastly outperforming its predecessor, GPT-2. This model's capabilities set the stage for future iterations like GPT-4, launched in March 2023, and GPT-5, expected in 2025, highlighting the rapid evolution of AI technology and its implications for various fields, including research and cybersecurity.

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OpenAI Launches GPT-5.5

OpenAI launched GPT-5.5 on April 23, 2026 for coding, office work and scientific research.
GPT-5.5 scored 75.1% on Terminal Bench 2.0, 78.7% OS World Verified, 84.9% GDPval, 81.8% Cyvergime, 25.0% GeneBench and 80.5% BixBench.
The model adds agentic multi-step task ability and includes OpenAI’s strongest cybersecurity safeguards that limit risky requests.
Jakub Pachocki said it lets researchers focus on higher-level goals, with GPT-5.5 available to ChatGPT and Codex subscribers, an API release planned.

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