DeepSeek: DeepSeek V3.1 Terminus

Coming soonQuick Start

DeepSeek V3.1 Terminus is DeepSeek's 671B-parameter hybrid reasoning model, released 2025-09 as a refinement of DeepSeek V3.1 with only 37B active parameters. It addresses language consistency and agent capability issues while improving coding and search agent performance, matching DeepSeek-R1 on difficult benchmarks with faster response times.

This model is not routed on MirAPI yet — prices shown are the official list prices. Create an account to get notified when it goes live.

Modalities
inTextoutText
Price / 1M
$0.27 / $1.00
Context
164K
Knowledge cutoff
2025-03-31

Capabilities

ReasoningTool usePrompt cachingStructured output

Benchmarks

bar = score (0–100) · ▏ median

Scores from vendor reports and public leaderboards. No private evals.

Intelligence Index
General ability
31.4
#50
Coding Index
Code
43.5
#51
Agentic Index
Agentic
19.9
#49
GPQA Diamond
Science QA
80.4
#49
τ-bench (airline)
Agentic tool use
68.8
#53

Showcase

Three fixed prompts, identical for every chat model. Outputs are archived verbatim — copy the prompt to reproduce.

Task prompt · identical for all models
Build a single-file HTML page using three.js from a CDN: a low-poly planet with a tilted ring of ~200 orbiting particles, a soft key light plus rim light, slow auto-rotation, and drag-to-orbit controls. No build tools — one file only.
Archived output
Archive not published yet

Every model will run this exact prompt; the output lands here verbatim, with tokens and per-run cost.

Quick Start

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.mirapi.ai/v1",   # changed
    api_key=os.environ["MIRAPI_API_KEY"],   # changed
)

resp = client.chat.completions.create(
    model="deepseek/deepseek-v3.1-terminus",
    messages=[{"role": "user", "content": "Hello"}],
)
Wire DeepSeek V3.1 Terminus into your product

1M free tokens to start · no card · OpenAI-compatible, one base_url change

Start free