DeepSeek Chat v3.1 Terminus

deepseek-chat-v3.1-terminus
byDeepseek|Created Sep 22, 2025
Chat Completions

DeepSeek-V3.1 Terminus is an enhanced version of DeepSeek V3.1 that retains the original model’s capabilities while resolving user-reported issues, such as language consistency and agent functionality. The update further refines the model’s performance in coding and search agent tasks. This large-scale hybrid reasoning model (671B parameters, 37B active) supports both thinking and non-thinking modes. Building on the DeepSeek-V3 foundation, it incorporates a two-phase long-context training approach, allowing for up to 128K tokens, and adopts FP8 microscaling for more efficient inference.

Pricing

Pay-as-you-go rates for this model. More details can be found here.

Input Tokens (1M)

$0.14

Output Tokens (1M)

$0.50

Capabilities

Input Modalities

Text

Output Modalities

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Supported Parameters

Available parameters for API requests

Frequency Penalty
Logit Bias
Logprobs
Max Completion Tokens
Presence Penalty
Reasoning Effort
Response Format
Stop
Temperature
Tool Choice
Tools
Top P