Model previewHigh global significanceConfirmed confidence
DeepSeek previews its reasoning line before V3 ships
R1-Lite-Preview exposes long-form reasoning on the web and promises an open model and API, showing that R1 was already underway before V3's release.
What happened
Event details
DeepSeek made R1-Lite-Preview available through its web product, displaying a live reasoning process and reporting competitive results on AIME and MATH. The announcement also promised a forthcoming open model and API. Because the preview appeared more than a month before DeepSeek-V3, it is strong evidence against the later claim that R1 was improvised in the 25 days between the V3 and R1 launch dates.
Assessment
Why it matters
The preview makes the parallel development of V3 and the R1 reasoning line visible in the public record.
78/100Global significance score. Regional effects are recorded only when the evidence supports a meaningful difference.