DeepSeek V3.1 — DeepSeek | Modeldex

DeepSeek V3.1

Active

DeepSeek-V3.1 is a large hybrid reasoning model (671B parameters, 37B active) that supports both thinking and non-thinking modes via prompt templates. It extends the DeepSeek-V3 base with a two-phase long-context...

Updated 4 days agoStructured data from Modeldex catalog

Budget

Knowledge cutoff

Mar 31, 2025(1.1 years ago)

API release

Aug 21, 2025(8 months ago)

Not enough benchmark coverage yet for an Intelligence Index — needs at least 3 results across 2 categories.

Overview

History

DeepSeek V3.1 became available via the DeepSeek API on 2025-08-21.

Training & availability

Training data has a knowledge cutoff of 2025-03-31 — information about events after that date is unlikely to appear in the model's responses. DeepSeek has not released the underlying model weights — access is via their hosted API only.

Capabilities

Context window: 32K tokens.
Input modalities: text.

Recommended for: cheap.

Limitations

The knowledge cutoff is 12 months old — this model will not know about recent events, releases, or API changes.
The context window (32K tokens) is modest by 2026 standards — unsuitable for processing long documents in a single request.
Text-only — cannot process images, audio, or video inputs.

Pricing

Input: $0.1500 per 1M tokens
Output: $0.7500 per 1M tokens

Use the cost calculator above to estimate monthly spend for your workload.

Quick start

Minimal example using the OpenRouter API. Copy, paste, replace the key.

from openai import OpenAI

client = OpenAI(
    base_url="https://openrouter.ai/api/v1",
    api_key="sk-or-...",
)
resp = client.chat.completions.create(
    model="deepseek/deepseek-chat-v3-1",
    messages=[{"role": "user", "content": "Explain quantum computing in one sentence."}],
)
print(resp.choices[0].message.content)

Cost calculator

Estimate your monthly bill. Presets are typical workload sizes.

Input tokens / month5.0M

@ $0.15/1M

Output tokens / month2.0M

@ $0.75/1M

Input cost

$0.75

5.0M × $0.15/1M

Output cost

$1.5

2.0M × $0.75/1M

Total / month

$2.25

$27 / year

Providers & performance

11 providers

Multi-provider inference routes for this model — sorted by throughput. Latency is time-to-first-token; throughput is output tokens per second. Data from OpenRouter, measured over the last 30 minutes.

Provider	Throughput	Latency (TTFT)	Input $ / 1M	Output $ / 1M	Context	Quant	Supports
Google	84tok/s	788ms	$0.6	$1.7	164K	—	tools · json
SambaNova	61tok/s	1.25s	$0.65	$1.5	131K	fp8	tools
Together	53tok/s

Popularity

Signals from open-source communities — not a quality measure, but useful for gauging adoption among developers.

🤗

HuggingFace downloads

149.5K/ month

HuggingFace likes

819

Integrations & tooling support

Tool calling: Not supported
Structured outputs: Not supported

Price vs quality

Budget pricing

Priced low — good for high-volume tasks. Quality tier pending more benchmark coverage.