DeepSeek V4 Flash vs Llama 3.1 70B Instruct

Name: DeepSeek V4 Flash
Author: DeepSeek

DeepSeek V4 Flash (2026) and Llama 3.1 70B Instruct (2024) are frontier reasoning models from DeepSeek and AI at Meta. DeepSeek V4 Flash ships a 1m-token context window, while Llama 3.1 70B Instruct ships a 128k-token context window. On HumanEval, Llama 3.1 70B Instruct leads by 14.6 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.

DeepSeek V4 Flash fits 8x more tokens; pick it for long-context work and Llama 3.1 70B Instruct for tighter calls.

Decision scorecard

Local evidence first

Signal	DeepSeek V4 Flash	Llama 3.1 70B Instruct	How to read it
Best for	reasoning-heavy apps, tool-calling agents, and long-context analysis	provider-routed production	Use-case synthesis from product type, capability flags, context, and provider data.
Decision fit	Coding, RAG, and Agents	Coding, RAG, and Long context	Primary workload tags from local decision data.
Context window	1m	128k	Higher is better when prompts, retrieval chunks, or transcripts are large.
Cheapest output	$0.12/1M tokens	$0.40/1M tokens	Cheapest tracked provider route; verify your exact region and tier.
Provider routes	5 tracked	13 tracked	Broader coverage can reduce vendor lock-in and fallback risk.
Shared benchmarks	2 shared	HumanEval leader	Visible benchmark lead is 14.6 points on HumanEval.

Decision tradeoffs

Choose DeepSeek V4 Flash when...

DeepSeek V4 Flash holds a shared-benchmark lead on Massive Multitask Language Understanding, ahead by 2.7 points.
DeepSeek V4 Flash has the larger context window for long prompts, retrieval packs, or transcript analysis.
DeepSeek V4 Flash has the lower cheapest tracked output price at $0.12/1M tokens.
DeepSeek V4 Flash uniquely exposes Reasoning and JSON / Tool use in local model data.
Local decision data tags DeepSeek V4 Flash for Coding, RAG, and Agents.

Choose Llama 3.1 70B Instruct when...

Llama 3.1 70B Instruct holds a shared-benchmark lead on HumanEval, ahead by 14.6 points.
Llama 3.1 70B Instruct has broader tracked provider coverage for fallback and route flexibility.
Local decision data tags Llama 3.1 70B Instruct for Coding, RAG, and Long context.

Monthly cost at traffic

Estimate token spend from the cheapest tracked input and output route or tier on this page.

Lower estimate DeepSeek V4 Flash

Requests / monthInput tokens / requestOutput tokens / request

DeepSeek V4 Flash

$76.26

Cheapest tracked route/tier: OpenRouter

Llama 3.1 70B Instruct

$420

Cheapest tracked route/tier: Hyperbolic AI Inference

Estimated monthly gap: $344. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

DeepSeek V4 Flash -> Llama 3.1 70B Instruct

Provider overlap exists on Microsoft Foundry, OpenRouter, and Vercel AI Gateway; start route-level A/B tests there.
Llama 3.1 70B Instruct is $0.28/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
Check replacement coverage for Reasoning and JSON / Tool use before moving production traffic.

Llama 3.1 70B Instruct -> DeepSeek V4 Flash

Provider overlap exists on OpenRouter, Microsoft Foundry, and Vercel AI Gateway; start route-level A/B tests there.
DeepSeek V4 Flash is $0.28/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
DeepSeek V4 Flash adds Reasoning and JSON / Tool use in local capability data.

Specs

Specification	DeepSeek V4 Flash DeepSeek	Llama 3.1 70B Instruct AI at Meta
Released	2026-04-24	2024-07-23
Context window	1m	128k
Parameters	284B	70B
Architecture	Mixture of Experts	Decoder Only
License	MITOSI-approved	Llama 3 Community
Openness	Open source	Open weights
Weights	Available	Available
Code	Unknown	Unknown
Commercial use	Commercial use: permitted	Commercial use: conditional
Knowledge cutoff	-	2023-12

Pricing and availability

Pricing attribute	DeepSeek V4 Flash	Llama 3.1 70B Instruct
Input price	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.	$0.40/1M tokens
Output price	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.	$0.40/1M tokens
Providers	DeepSeek Platform OpenRouter Microsoft Foundry Vercel AI Gateway Novita AI	Cloudflare Workers AI OctoAI API (Deprecated)Together AI Fireworks AI NVIDIA NIM Microsoft Foundry

Capabilities

Capability	DeepSeek V4 Flash	Llama 3.1 70B Instruct
Vision	No	No
Multimodal	No	No
Reasoning	Yes	No
JSON / Tool use	Yes	No
Structured outputs	Yes	Yes
Code execution	No	No
IDE integration	No	No
Computer use	No	No
Parallel agents	No	No

Benchmarks

Benchmark	DeepSeek V4 Flash	Llama 3.1 70B Instruct
HumanEval	69.5	84.1
Massive Multitask Language Understanding	88.7	86.0

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Last reviewed: 2026-07-11. Data sourced from public model cards and provider documentation.

Both models

DeepSeek V4 Flash Llama 3.1 70B Instruct