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DeepSeek V4.1 Flash

deepseek·deepseek/deepseek-v4.1-flash·BETA·Open weights·deepseek-flash series·NEW
DeepSeek V4.1 Flash model for reasoning and agentic coding

DeepSeek V4.1 Flash is offered by 76 providers on this page. Public prices are shown for 69 of them. Its official list price is $0.15 per 1M input tokens and $0.60 per 1M output tokens. The lowest paid channel is engy at $0.04 / $0.08 per 1M, about 16× below the list price. That channel is a third-party gateway, so confirm its availability and rate limits before depending on it. It also has 3 free ($0) channels and 4 covered by a paid subscription; free tiers usually carry rate limits, and subscription-covered access bills $0 per token only after the subscription fee.

Artificial Analysis rates it 39.5 on the Intelligence Index. Against its lowest blended price of $0.05 per 1M, that is roughly 790 index points per dollar, which is the value ratio the leaderboards rank on. Median output speed is 223 tokens per second, with 1.12s to the first token. Running one task of the Artificial Analysis suite costs about $0.2652, which reflects how many tokens its reasoning consumes rather than the unit price alone.

The context window is 1,000,000 tokens at the reference host, but hosts report different limits, from 327,680 to 1,050,000, so the usable window depends on the provider you pick. It supports reasoning, tool use, and structured output. Accepted input modalities are Text, Image, and PDF. The weights are open, so it can also be self-hosted or served through a gateway of your choice. Providers report the capability flags inconsistently, so verify a specific feature against the host you plan to use. Its training knowledge cuts off at 2025-05.

Specs & pricing

Input / output per 1M tokens
Official price·DeepSeek
$0.15 / $0.60
Blended $0.26 · Cache read $0.003
Lowest paid·engyGateway
$0.04 / $0.08
Blended $0.05 · 16.3× spread
3 more $0 channels
Context
1,000,000
Output limit
393,216
Knowledge cutoff
2025-05
Released / updated
2026-09-10 / 2026-09-10
Capabilities
✓ Reasoning✓ Tool use✓ Structured output✓ Temperature✓ Attachments
⚠ Providers report capability flags inconsistently
Modalities
TextImagePDF
License
MIT
Weights
Hugging Face

Quality & performanceArtificial Analysis · Intelligence Index v4.3 · rep. tier Max

Intelligence39.5
Value790
Coding—
Agentic—
Output speed223 tok/s
TTFT1.12 s
Cost per task$0.27
Value formulaIQ 39.5 ÷ min blended $0.050 = 790
Reasoning tier → intelligence / speed (higher tier = stronger but slower)
Non-reasoningIQ 24.7 · 219 tok/s
MaxIQ 39.5 · 223 tok/s

Quality is independently evaluated by Artificial Analysis. Speed/latency are model-level medians.

Available at 76 providers69 with public prices · 3 free · 4 subscription-covered

ProviderTierInputOutputCache readCache writeContextOutput limitStatus
Alibaba Token PlanGatewaySubscription$0$01,000,000384,000
NaN
deepseek-v4-flash
GatewayFree——1,000,000384,000
Umans AI Coding Plan
umans-deepseek-v4.1-flash
GatewaySubscription$0$01,048,576 ⚠393,215
Alibaba Token Plan (China)GatewaySubscription$0$01,000,000384,000
SCNet Token Plan
DeepSeek-V4.1-Flash
GatewaySubscription$0—1,000,000384,000
NvidiaCloudFree——1,000,000384,000
Kenari
deepseek-v4-1-flash
GatewayFree——1,000,000384,000
engyGateway$0.04$0.08$0.008—327,680 ⚠65,536
AMD
DeepSeek-V4.1-Flash
Cloud$0.14$0.28$0.0028—1,048,576 ⚠384,000
Eden AI
flexai/DeepSeek-V4.1-Flash
Gateway$0.14$0.42$0.021—1,048,576 ⚠384,000
DeepSeekOfficial
deepseek-flash
First-party$0.15$0.60$0.003—1,000,000393,216

Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.

Reasoning control

Toggle (on / off)effort = loweffort = higheffort = maxeffort = noneeffort = minimaleffort = mediumeffort = xhighbudget_tokens ≥ 1 ≤ 393,216

Interleaved thinking (reasoning between tool calls) is declared by 28 of 76 providers.

1 / 76 providers expose no reasoning control (reasoning_options: []).

Experimental modes1 items

ModeProviderInputOutputCache readCache write
priorityFireworks AI$0.38$1.50$0.0075—

Your usage cost

1engy$8.16
2AMD$25.54
3Eden AI$34.72
4NanoGPT$37.12
5DevPass (LLM Gateway)$38.12
6LLM Gateway$38.12
8DeepSeek · Official$42.36

7 more channels offer $0 (Alibaba Token Plan, NaN, Umans AI Coding Plan etc.); free tiers usually have rate limits and no SLA, excluded from ranking.

Switch to engy to save $34.20/mo (81%)
Note: this is a gateway; verify availability and rate limits yourself.

Price historyone sample accumulated per data sync

Input listOutput listMin blended
$1.20$02026-09-092026-10-032026-09-09 · Input list $0.162026-09-10 · Input list $0.302026-09-11 · Input list $0.152026-09-15 · Input list $0.152026-09-27 · Input list $0.152026-09-28 · Input list $0.152026-09-29 · Input list $0.152026-10-01 · Input list $0.152026-10-02 · Input list $0.152026-10-03 · Input list $0.152026-09-09 · Output list $0.312026-09-10 · Output list $1.202026-09-11 · Output list $0.602026-09-15 · Output list $0.602026-09-27 · Output list $0.602026-09-28 · Output list $0.602026-09-29 · Output list $0.602026-10-01 · Output list $0.602026-10-02 · Output list $0.602026-10-03 · Output list $0.602026-09-09 · Min blended $0.202026-09-10 · Min blended $0.202026-09-11 · Min blended $0.262026-09-15 · Min blended $0.182026-09-27 · Min blended $0.0992026-09-28 · Min blended $0.172026-09-29 · Min blended $0.182026-10-01 · Min blended $0.172026-10-02 · Min blended $0.182026-10-03 · Min blended $0.05

Benchmark34 items

NameConditionsScoreMetricSource
GPQA Diamondvariant: reasoning_effort=10090.9pass@1Source ↗
MathArena Apexvariant: reasoning_effort=10065.6pass@1Source ↗
Humanity's Last Examvariant: reasoning_effort=100 · dataset: full set36.8pass@1Source ↗
Humanity's Last Examvariant: reasoning_effort=100 · dataset: text-only subset39.1pass@1Source ↗
Codeforcesvariant: reasoning_effort=1003471ratingSource ↗
Terminal-Benchharness: DeepSeek Harness minimal mode · variant: reasoning_effort=100 · v2.190.6pass@1Source ↗
Terminal-Benchharness: DeepSeek Harness minimal mode · variant: reasoning_effort=100 · v3.030pass@1Source ↗
Terminal-Benchharness: DeepSeek Harness minimal mode · variant: reasoning_effort=100 · v4.031.2pass@1Source ↗
DeepSWEharness: mini-swe-agent · variant: reasoning_effort=100 · v1.174.2resolvedSource ↗
ProgramBenchharness: DeepSeek Harness minimal mode · variant: reasoning_effort=10020.3almost@1Source ↗
NL2Repoharness: DeepSeek Harness minimal mode · variant: reasoning_effort=10064scoreSource ↗
CyberGymvariant: reasoning_effort=10088.1pass@1Source ↗
ExploitGymvariant: reasoning_effort=10015.3pass@1Source ↗
AutomationBenchvariant: reasoning_effort=10054.8pass@1Source ↗
Agents' Last Examvariant: reasoning_effort=10031.8pass@1Source ↗
SEC-Bench Proharness: Claude Code · variant: reasoning_effort=10062.8pass@1Source ↗
Humanity's Last Examvariant: reasoning_effort=100; with tools63.9pass@1Source ↗
Chartographyharness: Claude Code · variant: reasoning_effort=100; with tools78.9pass@1Source ↗
BabyVisionharness: Claude Code · variant: reasoning_effort=100; with tools89.6pass@1Source ↗
ZeroBenchharness: Claude Code · variant: reasoning_effort=100; with tools · dataset: main49pass@5Source ↗
DeepSWEharness: Claude Code · variant: reasoning_effort=100 · v1.169.8resolvedSource ↗
Terminal-Benchharness: Claude Code · variant: reasoning_effort=100 · v2.188pass@1Source ↗
DeepSWEharness: Codex · variant: reasoning_effort=100 · v1.165.6resolvedSource ↗
Terminal-Benchharness: Codex · variant: reasoning_effort=100 · v2.184.1pass@1Source ↗
DeepSWEharness: OpenCode · variant: reasoning_effort=100 · v1.165.5resolvedSource ↗
Terminal-Benchharness: OpenCode · variant: reasoning_effort=100 · v2.185pass@1Source ↗
DeepSWEharness: Pi · variant: reasoning_effort=100 · v1.166.2resolvedSource ↗
Terminal-Benchharness: Pi · variant: reasoning_effort=100 · v2.186.1pass@1Source ↗
Terminal-Benchharness: mini-swe-agent · variant: reasoning_effort=100 · v2.190.3pass@1Source ↗
DeepSWEharness: DeepSeek Harness minimal mode · variant: reasoning_effort=100 · v1.172.6resolvedSource ↗
DeepSWEharness: DeepSeek Harness standard mode · variant: reasoning_effort=100 · v1.170.5resolvedSource ↗
Terminal-Benchharness: DeepSeek Harness standard mode · variant: reasoning_effort=100 · v2.185.8pass@1Source ↗
DeepSWEharness: DeepSeek Harness PTC mode · variant: reasoning_effort=100 · v1.167.6resolvedSource ↗
Terminal-Benchharness: DeepSeek Harness PTC mode · variant: reasoning_effort=100 · v2.185.8pass@1Source ↗

The same benchmark scores very differently across harness / dataset, so the qualifying conditions must be shown together.

Artificial Analysis evaluations3 items

Humanity's Last Exam39.2%
SciCode51.9%
AA-LCR84.0%

Individual evaluations run by Artificial Analysis, on the same reasoning tier as the intelligence score above. Each benchmark has its own task set and harness, so rows are not comparable with one another. The Intelligence Index above draws on a different, newer set of evaluations.

Related models

DeepSeek Flash Latestsame series$0.003 / $2.40deepseek-ai/DeepSeek-V4.1-Flash-Fastsame series$0.60 / $2.40DeepSeek V4.1 Flash (EU)same series$0.50 / $1.50Qwen3.7 Flashcheaper alternative$0.03 / $0.13Muse Spark 1.3 Contributorcheaper alternative$0.10 / $0.20Muse Spark 1.2 Contributorcheaper alternative$0.10 / $0.20Qwen Flashcheaper alternative$0.05 / $0.40
Data partly from models.dev (MIT) · DeepSeek official docs ↗