DeepSeek changelog: September 2025

2 releases from Sep 22 to September 29, 2025

Everything DeepSeek shipped in September 2025, collected from official DeepSeek sources. Each entry is dated and links to the page it came from.

September 2025 at a glance

September 2025 was DeepSeek's busiest month of the 12 months to then: 2 releases, about 3.4× its monthly average of 1. That was 1 release more than August 2025. Every release this month was Model.

Releases

+1 vs August 2025

Rank of 12 months

1st

Average 0.6 a month

Most shipped

Model

2 releases

Notable DeepSeek launches in September 2025

ModelSep 29
DeepSeek-V3.2-Exp
DeepSeek-V3.2-Exp upgrade for deepseek-chat and deepseek-reasoner models with enhanced reasoning capabilities.
Source: DeepSeek API Change Log
ModelSep 22
DeepSeek-V3.1-Terminus
DeepSeek-V3.1-Terminus upgrade with improved language consistency and agent performance optimizations.
Source: DeepSeek API Change Log

All DeepSeek releases in September 2025

Newest first. Each entry links to the official page it came from.

September 20252 releases

Sep 29

DeepSeek-V3.2-Exp

DeepSeek-V3.2-Exp upgrade for deepseek-chat and deepseek-reasoner models with enhanced reasoning capabilities.

DeepSeek-V3.2-ExpModelSource: DeepSeek API Change Log

Sep 22

DeepSeek-V3.1-Terminus

DeepSeek-V3.1-Terminus upgrade with improved language consistency and agent performance optimizations.

DeepSeek-V3.1-TerminusModelSource: DeepSeek API Change Log

Where September 2025 sits

DeepSeek releases per month, for September 2025 and the 11 months before it. A taller bar means more releases that month; the dated entries for each month are on its own page.