DeepSeek V4.1 Flash API
Released September 13, 2026 as the successor to V4 Flash. Thinking and non-thinking modes are switchable per request, and the model adds image understanding, tool calling, and JSON output. Peak pricing is $0.30/$1.20 with cached input at $0.006; off-peak rates are roughly half.
💰 Save up to 70% vs official DeepSeek pricingDeepSeek V4.1 Flash — cheaper than the official DeepSeek API
Access DeepSeek V4.1 Flash through AI API Hub and pay less per token. Same OpenAI-compatible endpoint, lower cost.
Technical Specifications
| Provider | DeepSeek |
| Model Family | DeepSeek V4.1 Flash |
| Release Date | 2026-09 |
| Context Window | 1M |
| Max Output Tokens | 393,216 |
| Input Price | $0.30 / 1M tokens |
| Output Price | $1.20 / 1M tokens |
| Vision Support | Yes ✓ |
| Function Calling | Yes ✓ |
| JSON Mode | Yes ✓ |
| Streaming | Yes ✓ |
| Fine Tuning | Not Available |
| Status | Active ✓ |
Overview
DeepSeek V4.1 Flash is DeepSeek's current deepseek model, released in 2026-09. Released September 13, 2026 as the successor to V4 Flash. Thinking and non-thinking modes are switchable per request, and the model adds image understanding, tool calling, and JSON output. Peak pricing is $0.30/$1.20 with cached input at $0.006; off-peak rates are roughly half.
For developers, the headline numbers are a 1M context window and up to 393,216 output tokens per response — enough headroom for newest deepseek release and 1m context / 384k output without chunking your input. Priced at $0.30/1M input and $1.20/1M output, it sits in the budget tier — ideal for high-volume pipelines where token cost dominates.
On the capability side, DeepSeek V4.1 Flash exposes 6 features: Reasoning, Code Generation, Vision, Tool Use, JSON Mode, Streaming. Note that fine-tuning isn't supported — you'll work with the base model. Vision support means you can pass images alongside text, handy for document parsing or UI automation.
The practical appeal of routing DeepSeek V4.1 Flash through AI API Hub is simplicity: one OpenAI-compatible endpoint, USDT & USDC payments, no credit card, and you're calling the API in under 30 seconds — just swap your base URL.
What Makes DeepSeek V4.1 Flash Different
How DeepSeek V4.1 Flash is used
DeepSeek V4.1 Flash is deployed where problems need step-by-step reasoning before code output — complex bug fixes, algorithmic implementation, math-heavy analysis, and multi-step refactoring. The internal chain-of-thought adds latency (expect slower responses), so don't route high-volume simple queries here. Use it for the hard 10% of tasks where cheaper models fail.
Pricing position within DeepSeek
DeepSeek V4.1 Flash sits in the middle of DeepSeek's pricing at $0.30/1M input — 18% below the lineup average ($0.14 cheapest, $0.70 most expensive). 3 siblings cost less, 2 cost more. This mid-tier positioning makes it a sensible default when you're unsure which variant to pick.
DeepSeek V4.1 Flash's role in the lineup
Within DeepSeek's lineup, DeepSeek V4.1 Flash is a mid-tier option — balanced between cost and capability. The deepseek family has 6 active variants, and DeepSeek V4.1 Flash occupies the lower end. This makes it a safe default for production workloads where you're not sure which tier to pick.
Real-world use cases
Real-world deployments: autonomous coding agents that fix complex bugs across multi-file codebases, algorithmic problem solving, math-heavy data analysis pipelines, and automated code review for architecture-level decisions. Teams route the simple 90% of coding tasks to cheaper models and reserve DeepSeek V4.1 Flash for the hard 10%.
vs sibling models
What makes DeepSeek V4.1 Flash different from sibling models: compared to DeepSeek V4 Pro ($0.25/1M more expensive, same 1M context); DeepSeek V4 Flash ($0.16/1M cheaper, same 1M context); DeepSeek Chat ($0.03/1M cheaper, 128K vs 1M context (smaller)). Choose DeepSeek V4.1 Flash when step-by-step reasoning matters more than speed.
API Examples
Python
from openai import OpenAI
client = OpenAI(
api_key="YOUR_API_KEY",
base_url="https://api.apiyihe.org/v1"
)
response = client.chat.completions.create(
model="deepseek-v4.1-flash",
messages=[
{"role": "user", "content": "Hello"}
]
)
print(response.choices[0].message.content)JavaScript / Node.js
import OpenAI from "openai";
const client = new OpenAI({
apiKey: process.env.API_KEY,
baseURL: "https://api.apiyihe.org/v1"
});
const response = await client.chat.completions.create({
model: "deepseek-v4.1-flash",
messages: [
{ role: "user", content: "Hello" }
]
});
console.log(response.choices[0].message.content);cURL
curl https://api.apiyihe.org/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "deepseek-v4.1-flash",
"messages": [
{"role": "user", "content": "Hello"}
]
}'Supported Features
| Vision / Image Input | ✅ Supported |
| Audio / Voice Input | ❌ Not Available |
| Function Calling | ✅ Supported |
| JSON Mode | ✅ Supported |
| Streaming | ✅ Supported |
| Fine-Tuning | ❌ Not Available |
| Multimodal | ❌ Not Available |
Benchmark Scores
| Benchmark | Score |
|---|---|
| MMLU | Not Publicly Available |
| GPQA | Not Publicly Available |
| SWE-Bench | Not Publicly Available |
| HumanEval | Not Publicly Available |
| GSM8K | Not Publicly Available |
| MATH | Not Publicly Available |
| MMMU | Not Publicly Available |
Pricing History
DeepSeek V4.1 Flash was released in 2026-09 by DeepSeek and is currently publicly available via AI API Hub.
Current Pricing: $0.30 per 1M input tokens · $1.20 per 1M output tokens. Pay-as-you-go with no minimum commitment.
Pricing Model: Token-based billing (pay per use). No subscription fees. No hidden costs.
💡 DeepSeek occasionally updates pricing. AI API Hub reflects current pricing in real-time. All prices in USD. Pay with USDT or USDC — no currency conversion fees.
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Frequently Asked Questions
What is DeepSeek V4.1 Flash?
DeepSeek V4.1 Flash is DeepSeek's current deepseek model. Released September 13, 2026 as the successor to V4 Flash. Thinking and non-thinking modes are switchable per request, and the model adds image understanding, tool calling, and JSON output. Peak pricing is $0.30/$1.20 with cached input at $0.006; off-peak rates are roughly half. It offers a 1M context window and supports Reasoning, Code Generation, Vision. You can access it through AI API Hub using USDT or USDC — no credit card required.
How much does DeepSeek V4.1 Flash cost?
DeepSeek V4.1 Flash is priced at $0.30 per 1M input tokens and $1.20 per 1M output tokens, billed pay-as-you-go with no minimum. Through AI API Hub you can start with as little as $5 and scale from there.
DeepSeek V4.1 Flash vs GPT-6 Astra?
They're built for different jobs. DeepSeek V4.1 Flash costs $0.30/1M input with a 1M window; GPT-6 Astra runs $10.00/1M input with 1M. DeepSeek V4.1 Flash is the more cost-effective pick and still brings newest deepseek release. See the full side-by-side at /compare/deepseek-v4.1-flash-vs-gpt-6-astra/.
DeepSeek V4.1 Flash context window?
DeepSeek V4.1 Flash has a 1M context window, capable of processing up to 1,048,576 tokens in a single request. Maximum output tokens: 393,216.
Does DeepSeek V4.1 Flash support function calling?
Yes, DeepSeek V4.1 Flash supports function/tool calling, allowing you to define functions that the model can invoke. This enables AI agents, API integrations, and structured data extraction.
Is DeepSeek V4.1 Flash multimodal?
Partially — DeepSeek V4.1 Flash supports vision (image input) but not native audio processing.
DeepSeek V4.1 Flash API rate limits?
DeepSeek V4.1 Flash rate limits: 10K RPM. Higher tier plans offer increased throughput. For high-volume production use, consider DeepSeek's faster variant models.
How to access DeepSeek V4.1 Flash API?
Access DeepSeek V4.1 Flash through AI API Hub: (1) Register at z.apiyihe.org/register?aff=ZVtr, (2) Deposit USDT/USDC, (3) Get your API key instantly, (4) Use the OpenAI-compatible endpoint https://api.apiyihe.org/v1 with model name "deepseek-v4.1-flash". Start building in under 30 seconds.