Models

DeepSeek V3 Fast vs DeepSeek V4 Flash

Compare DeepSeek V3 Fast from DeepSeek and DeepSeek V4 Flash from DeepSeek on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.

DeepSeekDeepSeek V3 FastDeepSeekDeepSeek V4 Flash
DeepSeek logo
DeepSeek V3 Fast
DeepSeek · text → text

V3 Ultra-Fast Version,The current price is a limited-time 50% discount and will return to the original price on July 31st. The original price is: input: $0.55/M, output: $2.2/M. The model provider is the Sophnet platform. DeepSeek V3 Fast is a high-TPS, ultra-fast version of DeepSeek V3 0324, featuring full-precision (non-quantized) performance, enhanced code and math capabilities, and faster responses! DeepSeek V3 0324 is a powerful Mixture-of-Experts (MoE) model with a total parameter count of 671B, activating 37B parameters per token. It adopts Multi-Head Latent Attention (MLA) and the DeepSeekMoE architecture to achieve efficient inference and economical training costs. It innovatively implements a load balancing strategy without auxiliary loss and sets multi-token prediction training targets to enhance performance. The model is pre-trained on 14.8 trillion diverse, high-quality tokens and further optimized through supervised fine-tuning and reinforcement learning stages to fully realize its capabilities. Comprehensive evaluations show that DeepSeek V3 outperforms other open-source models and rivals leading closed-source models in performance. The entire training process only requires 2.788M H800 GPU hours and remains highly stable, with no irrecoverable loss spikes or rollbacks.

Input$0.56 /M
Output$2.24 /M
DeepSeek logo
DeepSeek V4 Flash
DeepSeek · text → text

(This model currently points to the older 0423 version; if you need to request the latest version, you can choose the model deepseek-v4-flash-0731)DeepSeek-V4 features an ultra-long context of one million characters and achieves leading performance domestically and in the open-source domain in agent capabilities, world knowledge, and reasoning.

Input$0.142 /M
Output$0.284 /M
Cache read$0.0284 /M

Pricing & Specifications

Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.

DeepSeek V3 Fast
DeepSeek V4 Flash
Input /M
$0.56
$0.142
Output /M
$2.24
$0.284
Cache read /M
-
$0.0284
Context length
32,000
1,000,000
Max output
32,000
384,000
Time to First Token
1.5 s
1.0 s
Throughput
150.0 tok/s
66.5 tok/s
Modalities
text
text
Supported Parameters
toolsfunction callingstructured outputs
toolsfunction callingstructured outputsthinking
API Formats
chat_completions · claude_api
Released
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April 24, 2026

Promotional prices show the discounted rate; see each model page for promotion windows.

Activity Past 30 Days

Daily traffic served through AIHubMix — how demand for each model is trending.

DeepSeek-V3-Fastdeepseek-v4-flash

Tokens / day

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Requests / day

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Performance Past 3 Days

Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.

DeepSeek-V3-Fastdeepseek-v4-flash

Throughput (tok/s)

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TTFT (s)

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Uptime (%)

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LMArena Benchmarks

LMArena ratings by capability (Bradley-Terry, commonly called Elo). Higher is better.

Text
DeepSeek-V3-Fastdeepseek-v4-flash
13401380142014601500
Overall
13951436
Coding
14291483
Math
13701426
Hard prompts
14091459
Instruction following
13791428
Multi-turn
14101452
Creative writing
13901408
Longer query
13931448
Chinese
14141473
English
14081445

Source: LMArena (arena.ai) leaderboard, imported by AIHubMix. Models without published ratings are omitted per chart.

Cost calculator

Estimate your monthly bill for the same workload on each model.

DeepSeek V4 Flash
$12.78 /mo
DeepSeek V3 Fast
$67.20 /mo

Monthly = daily × 30. Discounted rates applied where a promotion is active.

FAQ

Which is cheaper: DeepSeek V3 Fast, DeepSeek V4 Flash?

DeepSeek V4 Flash: $0.284/M output tokens; DeepSeek V3 Fast: $2.24/M. Use the cost calculator above to estimate your own workload.

How do their coding arena scores compare?

DeepSeek V4 Flash: 1483; DeepSeek V3 Fast: 1429 (LMArena coding leaderboard).

Which responds faster?

DeepSeek V4 Flash: 1.0s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.

How large is each context window?

DeepSeek V3 Fast accepts 32,000 and DeepSeek V4 Flash accepts 1,000,000 input tokens. Maximum output per request is 32,000 tokens on DeepSeek V3 Fast and 384,000 tokens on DeepSeek V4 Flash.

Which one generates tokens faster?

DeepSeek V3 Fast at 150.0 tok/s and DeepSeek V4 Flash at 66.5 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.

What inputs and capabilities does each model support?

DeepSeek V3 Fast accepts text input and supports tool calling, function calling and structured outputs; DeepSeek V4 Flash accepts text input and supports tool calling, function calling, structured outputs and thinking.

Can I call DeepSeek V3 Fast and DeepSeek V4 Flash with the same API key?

Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.

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