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DEEPSEEK · MODEL RELEASE TRACKER

DeepSeek-V4-Pro

A high-capability release in the DeepSeek-V4 family (announced in the V4 preview). Reported as having 1.6T total / 49B active parameters and support for 1M-token context; announced live and open-sourced in April 2026. DeepSeek later announced phasing out V4-Pro and routing requests to V4.1-Flash (Sept 2026).

CURRENT SNAPSHOT3/5 DIMENSIONS WITH DATA

The dimensions that change the decision.

PRICING

Not established from the available sources.

CONTEXT WINDOW
Context windowSupports a 1,000,000-token (1M) context as the default across DeepSeek V4 services.
MODALITIES

Not established from the available sources.

BENCHMARKS
Benchmark performanceStated as having performance that rivals the world's top closed-source models.
Relative performance vs V4.1-FlashTests reported by DeepSeek state that V4.1-Flash was ahead of V4-Pro on performance, cost, speed, and total runtime.
AVAILABILITY
Availability / accessAnnounced as live and open-sourced; available via chat.deepseek.com (Expert Mode / Instant Mode) and via the updated API (model name deepseek-v4-pro).

RELEASE TIMELINE

Published, source-backed release events only.

1 SOURCES · IMPORTANCE 8.0

DeepSeek launches DeepSeek‑V4.1‑Flash with new causal encoder–decoder and lower costs

DeepSeek announced DeepSeek‑V4.1‑Flash, a smaller-native-vision model using a new Causal Encoder–Decoder design (8B active params for input, 16B for output), new pretraining and larger-scale RL post-training, plus KV‑cache compression. The company is retiring V4‑Flash variants, routing deepseek-v4-pro traffic to V4.1‑Flash from 04:00 UTC on Sept 14, 2026, and changing pricing (new rates take effect 04:00 UTC on Sept 10, 2026) while partners WorkBuddy, CodeBuddy and OpenCode already support V4.1‑Flash.

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VERIFIABLE FACTS

Every value stays attached to a source and date.

WHAT CHANGED

Stored passport versions, without reconstructed history.

Passport created5 facts