DeepSeek
DeepSeek V4 preview
Announced Apr 24, 2026
A new long context family
01
What could it do?
DeepSeek previewed V4 Pro and Flash with million token context.
02
What changed?
Two sizes and thinking modes.
WHY IT MATTERED
More room for long inputs.
03
Where it fell short
Preview, not the later general release.
Sources checked Oct 7, 2026
Release facts were checked against the sources below. Performance claims belong to the developers; we have not independently tested these models.
Developer announcement or release logBenchmark results
No comparable ECI score is available for this release in our source snapshot. Missing scores are never estimated.