Glossary
Theo Reason
GlossaryBy OpenCharts TeamPublished
Theo Reason is the deep-thinking engine — extended-deliberation reasoning for hard math, plans, and analysis tasks.
In depth
Theo Reason powers Think Mode’s heaviest queries and is the engine used when correctness and stepwise rigor are non-negotiable. It trades latency for accuracy.
Also known as
reasoning engine
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See enginesRelated terms
Think Mode
Think Mode runs Theo’s deep reasoning engine — slower but with better answers for hard problems, multi-step plans, and code or analysis tasks where correctness matters.
Theo Pro
Theo Pro is the higher-quality conversational engine — used for hard reasoning, code, and modes where correctness and depth matter more than latency.