GPT-5.6 Cyber (Reasoning)

by OpenAI

GPT-5.6 Cyber (Reasoning) is a reasoning model from OpenAI, released on August 10, 2026. It has a 400K-token context window and can generate up to 128K output tokens. API pricing is $12.5 per 1M input tokens and $75 per 1M output tokens.

GPT-5.6 Cyber is OpenAI's purpose-trained cybersecurity model for authorized vulnerability research, exploit validation, and security testing via the gated Daybreak Red tier (distinct from GPT-5.6 Sol / Daybreak Blue). The daybreak-red-latest alias routes to gpt-5.6-cyber. OpenAI API list prices are $12.50 input / $1.25 cached input / $75 output per 1M tokens, with a 400K-token context window (prompts over 272K input tokens billed at 2x input and 1.5x output) and 128K max output; supports the Responses API. OpenAI reports Advanced Cybersecurity Completion Rate 95% (internal Daybreak evaluation; https://openai.com/index/expanding-daybreak-as-the-cyber-defense-window-narrows/). OpenAI states the model was used in research that uncovered previously unknown vulnerabilities in Chrome's V8 (CVE-2026-15903). Assessed High (not Critical) for cybersecurity under OpenAI's Preparedness Framework; requires Daybreak approval and provisioning.

Key specs

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