DeepSeek 4.1 Flash (Free-01)
deepseek-4.1-flash-free-01
DeepSeek 671B reasoning & chat model with DeepThink CoT reasoning. Free cluster slot 01.
131.1k ContextCoT
cluster: deepseekLaunch in Playground
Direct access to DeepSeek 4.1 Flash (Free-01), NVIDIA Nemotron 3.5 Lightning (1M Context), and Mistral Leanstral through one lightning-fast OpenAI-compatible wire endpoint.
curl https://nextrouter.nextapi.online/v1/chat/completions \
-H "Authorization: Bearer $NEXTROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "deepseek-4.1-flash-free-01",
"messages": [
{ "role": "user", "content": "Explain quantum computing in one short sentence." }
],
"stream": true
}'Execute live request against cluster. No API key required.
Active Models
6 Live
6 100% Free Tier
Max Context Window
1,048,576
Tokens per request
Streaming Velocity
~65 tok/s
Real-time SSE chunks
Token Pricing
$0.00
Free cluster forever
Each model is accessible via /v1/chat/completions using standard OpenAI parameters.
deepseek-4.1-flash-free-01
DeepSeek 671B reasoning & chat model with DeepThink CoT reasoning. Free cluster slot 01.
nemotron-3.5-lightning
Blazing fast 65+ tok/s model with a massive 1,000,000 token context window and native tool calling.
leanstral-1-5
Mistral flagship reasoning and coding model with 256K context and 46 tok/s throughput.
nemotron-550b-ultra
Titan 550 Billion parameter model with 1 Million token context for top-tier complex reasoning.
gemma-4-31b
Google multimodal vision and reasoning open weights model with 256K context.
muse-glimmer-30b
High-speed multimodal 44 tok/s model with vision, reasoning, and tool calling.
Engineering Grade
NextRouter handles connection pooling, model queue serialization, AES-256 key security, and real-time streaming telemetry automatically.
Point Cursor, Claude Code, Cline, LangChain, or standard OpenAI SDK to https://nextrouter.nextapi.online/v1. Same schemas, zero rewrites.
Nemotron 3.5 Lightning and Nemotron Ultra allow analyzing entire git repositories or 500-page PDF books in one prompt.
Integrated chain-of-thought planning bridge with auto-nudge recovery and Principal Software Architect system instructions for bug-free code.
Serialized request queueing shields upstream Requesty models from concurrent throttling, guaranteeing seamless multi-user traffic.
Real-time Server-Sent Events (SSE) streaming with sub-second TTFT latency meters, live tok/s velocity meters, and server-side accounting.
Integration
Sign in with Google in one click or test instantly in the public guest playground with zero login required.
Set baseURL to https://nextrouter.nextapi.online/v1. Every tool and library works identically.
Enjoy massive 1M token context windows, DeepSeek reasoning, and ultra-low latency with zero token billing.
Start streaming completions immediately. Test with zero setup in the playground or plug your key directly into Cursor or Python.