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DeepSeek: DeepSeek V3.1 Terminus

DeepSeek-V3.1 Terminus is an update to [DeepSeek V3.1](/deepseek/deepseek-chat-v3.1) that maintains the model's original capabilities while addressing issues reported by users, including language consistency and agent capabilities, further optimizing the model's performance in coding and search agents. $0.27 per million input tokens, $1 per million output tokens. 163,840 token context window, maximum output of 32,768 tokens. Higher uptime with 4 providers. Includes independent benchmarks from Artificial Analysis.

View source on OpenRouter Hugging Face
Overview

Model specifications

Context
163,840 tokens
Maximum output
32,768 tokens
Architecture
text->text
Tokenizer
DeepSeek
Knowledge cutoff
2025-03-31
Moderated
No
OPENROUTER

Complete pricing

Synchronized OpenRouter rates. Token prices are shown per one million tokens.

Input
$0.27
/M tokens
Output
$1
/M tokens
Cache read
$0.135
/M tokens
API

Model configuration

Reasoning

Moderated
No
Default parameters
No
API

Quick start

Call this exact model ID through OpenRouter’s OpenAI-compatible API.

curl https://openrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"deepseek/deepseek-v3.1-terminus","messages":[{"role":"user","content":"Hello!"}]}'
Capabilities

Input → Output

Input
text
Output
text
Reasoning

No

API

Supported API parameters

frequency_penaltyinclude_reasoninglogit_biasmax_tokensmin_ppresence_penaltyreasoningrepetition_penaltyresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_ktop_p
Available providers

4 providers

Live providers on OpenRouter

Provider availability, latency, throughput and routing can change continuously. Open the source page for current operational data.

OpenRouter

Novita

fp8
Context
131K
Maximum output
33K
Input
$0.270
Output
$1.00
Cache read
$0.135
Cache write
Not provided

SiliconFlow

fp8
Context
164K
Maximum output
147K
Input
$0.270
Output
$1.00
Cache read
Not provided
Cache write
Not provided

AtlasCloud

fp8
Context
131K
Maximum output
66K
Input
$0.300
Output
$0.950
Cache read
$0.130
Cache write
Not provided

StreamLake

unknown
Context
128K
Maximum output
32K
Input
$0.343
Output
$1.03
Cache read
Not provided
Cache write
Not provided
deepseek

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Input: $0.065Output: $0.180per 1M tokens
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