GPT-5.6 Sol
by OpenAI
OpenAI's flagship for hard agentic work, careful reasoning, and tasks where persistence matters more than speed. Try GPT-5.6 Sol on Zo.
Knowledge cutoffFeb 2026
Context window1.1M tokens
Release dateJul 2026
Input
$5.00 / 1M tokensOutput
$30.00 / 1M tokensCached
$0.50 / 1M tokensCache write
$6.25 / 1M tokensHow we rate models
- Quality. Three brains is top, one is basic. We anchor the rating on SWE-bench Verified — the industry-standard coding benchmark — how often a model solves real GitHub issues end-to-end.
- Fast. Shown when the model can produce at least roughly 80 tokens per second (about 60 words a second). Not every model qualifies.
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