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GPT-5.6 Sol

By OpenAI
Model family: GPT
GPT-5.6 Sol is the highest-tier model in the GPT-5.6 family, alongside Terra and Luna as lower-cost tiers. Sol sets a new state of the art on Terminal-Bench 2.1 for command-line coding workflows requiring planning and tool coordination. On GeneBench v1, it improves long-horizon genomics and quantitative biology analysis over GPT-5.5 while using fewer tokens. In cybersecurity, it advances performance on ExploitBench and ExploitGym for vulnerability research and exploitation tasks while matching Mythos Preview at roughly 1/3 the output tokens. A new max reasoning effort setting enables deeper extended reasoning, and ultra mode uses subagents to parallelize complex multi-step work. The model includes layered safeguards: model-level refusals, real-time cyber and biology misuse classifiers with generation pausing, and account-level monitoring. Priced at $5 input / $30 output per 1M tokens, with 90% prompt caching discount, explicit cache breakpoints, and a 30-minute minimum cache life.
New Text Gen 7
Released: June 26, 2026

Overview

GPT-5.6 Sol is OpenAI's flagship model in the GPT-5.6 series. It achieves state-of-the-art performance on coding (Terminal-Bench 2.1), biology (GeneBench v1), and cybersecurity (ExploitBench) benchmarks. Features a new max reasoning effort setting and ultra mode for multi-agent parallelism. Priced at $5/$30 per 1M input/output tokens, currently in limited preview.

About OpenAI

OpenAI is a technology company that specializes in artificial intelligence research and innovation.

Industry: Artificial Intelligence
Company Size: 4500
Location: San Francisco, California, US
Website: openai.com
View Company Profile
Last updated: June 30, 2026
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