DeepSeek API changelog

DHS orders US federal civilian agencies to remove DeepSeek products

A Department of Homeland Security order published in the Federal Register on October 20, 2026 tells federal civilian agencies to stop buying DeepSeek products, including third-party products built with DeepSeek technology, and remove them from their systems. Agencies can request exceptions within 60 days.

Who is affected:

US federal civilian agencies and vendors that sell them products built on DeepSeek models.

Action needed:

If you sell to US federal civilian agencies, check whether your product uses DeepSeek models.

DeepSeek starts billing server-side search and fetch calls October 31

Search and Fetch API calls cost $0.75 per 1,000 requests. Calls made through server-side tools in DeepSeek Harness, Claude Code and Codex are free until billing starts at 16:00 UTC on October 31, 2026.

Who is affected:

Developers using DeepSeek models in Claude Code, Codex or DeepSeek Harness with web search.

What to do:

Expect new per-request charges for search and fetch after October 31, 2026.

DeepSeek lowers API prices with V4.1-Flash

DeepSeek lowered API prices with the V4.1-Flash launch, keeping off-peak rates at 50% of peak, effective 04:00 UTC on September 10, 2026. The pricing page lists deepseek-flash at $0.30 input (cache miss) and $1.20 output per 1M tokens at peak.

DeepSeek keeps V4-Pro running after September 14

DeepSeek had said deepseek-v4-pro requests would move to V4.1-Flash from September 14. It now keeps serving V4-Pro after that date at the same prices: $1.32 input (cache miss) and $3.96 output per 1M tokens at peak.

Who is affected:

Apps calling deepseek-v4-pro.

What to do:

Keep using deepseek-v4-pro if you rely on it.

DeepSeek introduces peak and off-peak API pricing

DeepSeek updated API pricing with peak and off-peak rates, with off-peak 50% lower than peak, effective 16:00 UTC on August 16, 2026.

Who is affected:

DeepSeek API users, especially those running heavy workloads during peak hours.

What to do:

Schedule flexible batch workloads in off-peak hours.

DeepSeek-V4-Flash official API release enters public beta

DeepSeek re-post-trained V4-Flash as DeepSeek-V4-Flash-0731 with much stronger agent benchmarks than V4-Pro-Preview and native Responses API support for Codex. The deepseek-v4-flash model name now serves it. The V4-Pro API and the app and web models were unchanged.

Who is affected:

Apps calling deepseek-v4-flash.

What to do:

Retest prompts on deepseek-v4-flash, since the model behind the name changed.