DeepSeek

The official host for DeepSeek's own models — V3 for chat/agents, R1 for deep reasoning — at some of the lowest prices anywhere.

Get an API key

1. Sign up at platform.deepseek.com (email or Google)
2. Open the API Keys page in the console
3. Click 'Create API Key' and name it
4. Copy the key now — it's shown only once
5. Export it as DEEPSEEK_API_KEY

Create a key ↗ · Pricing ↗

New accounts get free trial tokens; no credit card to start.

Enable

export DEEPSEEK_API_KEY=...        # shell profile — survives forever

or in the terminal — validates the key live before saving:

/enable deepseek

or pick any locked 🔒 DeepSeek model in /models and paste the key inline.

Models

Starter menu (once enabled, /models fetches the provider's full live list):

• deepseek-chat
• deepseek-reasoner

Switch anytime — /model deepseek-chat fuzzy-matches; context carries over.

SDK

from mantis_agent import MantisAgentOptions
options = MantisAgentOptions(
    model="deepseek-chat",
    backend="https://api.deepseek.com/v1",     # key read from $DEEPSEEK_API_KEY
)

Notes

• deepseek-reasoner (R1) returns thinking tokens; mantis renders them as thinking blocks.
• Prices are per-token among the lowest of any frontier-adjacent model.