Released 32 days after DeepSeek V3.1 · All DeepSeek releases
DeepSeek-V3.1 Terminus, released in September 2025, refines V3.1 with targeted production-stability improvements. The 671-billion-parameter model keeps 37 billion active parameters and a 128K-token context while addressing the language-consistency and tool-use issues users reported. The update reduces Chinese-English code-mixing and stray-character generation seen in earlier versions, producing more reliable multilingual output. DeepSeek also reports stronger Code Agent and Search Agent behavior, making Terminus a steadier choice for multi-tool agentic workflows. It retains the hybrid thinking and non-thinking modes of V3.1 and is available with open weights on Hugging Face, aimed at deployments that need robust, predictable multilingual performance.
DeepSeek V3.1 Terminus runs on 2 different routes through the Opper gateway. Compare residency, ZDR, and training posture at a glance — full data-handling detail per route below.
DeepSeek V3.1 Terminus runs on 2 independently monitored routes through the Opper gateway. A direct integration leaves you on one of them, the gateway serves whichever is healthy.
Measured over the last 30 days from each provider's official status feed via StatusGator. Refreshed hourly. See uptime for every provider Opper monitors.
Each route hosting DeepSeek V3.1 Terminus has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.
Zero data retention is on by default on Pay-as-you-go — no action required. No training on customer data. US; unknown; DPA available.
Zero data retention is on by default on Pay-as-you-go — no action required. No training on customer data. US; SCCs; DPA available.
Independent benchmark scores — composite indices for reasoning, coding, and math, plus individual eval scores where available.
Call DeepSeek V3.1 Terminus through the Opper gateway with one API key. Let your coding agent set it up, or call it directly — Opper is drop-in compatible with the OpenAI, Anthropic, and Google AI SDKs.
Copy this and paste it into a coding agent like Claude Code, Cursor or Codex and it'll wire up Opper for you.
import OpenAI from "openai";const client = new OpenAI({apiKey: process.env.OPPER_API_KEY,baseURL: "https://api.opper.ai/v3/compat",});const completion = await client.chat.completions.create({model: "deepinfra/deepseek-ai/DeepSeek-V3.1-Terminus",messages: [{ role: "user", content: "Hello" }],});console.log(completion.choices[0].message.content);
Side-by-side on privacy, EU hosting, pricing, and benchmarks.
