DeepSeek R1 vs DeepSeek V4 Flash

Name: DeepSeek R1
Author: DeepSeek

Keep DeepSeek R1 if downloadable weights and a 128K context window fit your deployment. Choose DeepSeek V4 Flash when you need a current public-beta direct API, 1M context, or documented JSON Output and Tool Calls. Recalculate Flash from DeepSeek's official pricing page using cache state and request time; no source-qualified R1-versus-Flash price or benchmark winner exists.

As of September 7, 2026, V4 Flash is the direct-API choice for Long context and documented JSON / Tool use; its price changes with cache state and peak or off-peak timing. Keep R1 for a weights-based deployment that fits 128K, then test both exact builds on your Coding and Agents workload.

Decision scorecard

Local evidence first

Signal	DeepSeek R1	DeepSeek V4 Flash	How to read it
Best for	reasoning-heavy apps and provider-routed production	reasoning-heavy apps, tool-calling agents, and long-context analysis	Use-case synthesis from product type, capability flags, context, and provider data.
Decision fit	Coding, RAG, and Agents	Coding, RAG, and Agents	Primary workload tags from local decision data.
Context window	128k	1m	Higher is better when prompts, retrieval chunks, or transcripts are large.
Shared benchmarks	Withheld	Withheld	Shared rows are withheld because the published results use incompatible benchmark variants and harnesses.

Decision tradeoffs

Choose DeepSeek R1 when...

Local decision data tags DeepSeek R1 for Coding, RAG, and Agents.

Choose DeepSeek V4 Flash when...

DeepSeek V4 Flash has the larger context window for long prompts, retrieval packs, or transcript analysis.
DeepSeek V4 Flash uniquely exposes JSON / Tool use in local model data.
Local decision data tags DeepSeek V4 Flash for Coding, RAG, and Agents.

Switch friction

DeepSeek R1 -> DeepSeek V4 Flash

DeepSeek V4 Flash adds JSON / Tool use in local capability data.

DeepSeek V4 Flash -> DeepSeek R1

Check replacement coverage for JSON / Tool use before moving production traffic.

Specs

Specification	DeepSeek R1 DeepSeek	DeepSeek V4 Flash DeepSeek
Released	2025-01-20	2026-04-24
Context window	128k	1m
Parameters	671B, 37B Active	284B
Architecture	Decoder Only	Mixture of Experts
License	MITOSI-approved	MITOSI-approved
Openness	Open source	Open source
Weights	Available	Available
Code	Unknown	Unknown
Commercial use	Commercial use: permitted	Commercial use: permitted
Knowledge cutoff	2023-12	-

Pricing and availability

Pricing attribute	DeepSeek R1	DeepSeek V4 Flash
Input price	$0.10/1M tokens	Off-peak $0.22/1M tokens All UTC hours outside DeepSeek's peak windows. Cache-hit input: $0.007 per 1M tokens; cache-miss input: $0.22 per 1M; output: $0.66 per 1M. Peak $0.44/1M tokens 01:00-04:00 and 06:00-10:00 UTC. Cache-hit input: $0.014 per 1M tokens; cache-miss input: $0.44 per 1M; output: $1.32 per 1M.
Output price	$0.30/1M tokens	Off-peak $0.66/1M tokens All UTC hours outside DeepSeek's peak windows. Cache-hit input: $0.007 per 1M tokens; cache-miss input: $0.22 per 1M; output: $0.66 per 1M. Peak $1.32/1M tokens 01:00-04:00 and 06:00-10:00 UTC. Cache-hit input: $0.014 per 1M tokens; cache-miss input: $0.44 per 1M; output: $1.32 per 1M.

Capabilities

Capability	DeepSeek R1	DeepSeek V4 Flash
Vision	No	No
Multimodal	No	No
Reasoning	Yes	Yes
JSON / Tool use	No	Yes
Structured outputs	Yes	Yes
IDE integration	No	No
Computer use	No	No
Parallel agents	No	No

Benchmarks

No like-for-like benchmark rows are shown for this pair.

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Model pages

Labs and families

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Last reviewed: 2026-07-03. Data sourced from public model cards and provider documentation.

Both models

DeepSeek R1 DeepSeek V4 Flash