DeepSeek V3.1 API
About
Build advanced reasoning agents with DeepSeek V3.1, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.56/1M input and $1.68/1M output tokens, native tool calling support, open weights architecture. Access DeepSeek V3.1 via the Fireworks AI API with up to 164K output tokens.
Capabilities
Input Modalities
text
Output Modalities
text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsOpen
Limits
Context Window
164K
Tokens
Input Limit
164K
Tokens
Max Output
164K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.56
Output
$1.68
Frequently Asked Questions
DeepSeek V3.1 by Fireworks AI costs $0.56 per 1M input tokens and $1.68 per 1M output tokens.
Model Details
ID
accounts/fireworks/models/deepseek-v3p1
Provider
Fireworks AIFamily
deepseek
Release Date
Aug 21, 2025
Knowledge Cutoff
Jul 1, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
FIREWORKS_API_KEY
API Base URL
https://api.fireworks.ai/inference/v1/