Qwen: Qwen3 4B (free)
by qwen
About
Qwen3-4B is a 4 billion parameter dense language model from the Qwen3 series, designed to support both general-purpose and reasoning-intensive tasks. It introduces a dual-mode architecture—thinking and non-thinking—allowing dynamic switching between high-precision logical reasoning and efficient dialogue generation. This makes it well-suited for multi-turn chat, instruction following, and complex agent workflows.
Specifications
Error Rate
Based on feedback reported by Free LLM Router users. Error rate reflects the percentage of requests that encountered issues such as rate limiting, unavailability, or errors. Learn more.
Availability
Available 41 of 41 tracked days. Daily snapshots show whether this model was accessible as a free model on OpenRouter.
| Feb | Mar | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Model | Days | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| Qwen: Qwen3 4B (free) | 30 | ||||||||||||||||||||||||||||||
Similar Models
More from Qwen
Frequently Asked Questions
Is Qwen: Qwen3 4B (free) free to use?
Yes, Qwen: Qwen3 4B (free) is completely free to use through OpenRouter. You can access it via the Free LLM Router API at no cost.
What is the context window for Qwen: Qwen3 4B (free)?
Qwen: Qwen3 4B (free) supports a context window of 41K tokens (40,960 tokens).
Does Qwen: Qwen3 4B (free) support function calling (tools)?
Yes, Qwen: Qwen3 4B (free) supports function calling / tool use, enabling it to interact with external APIs and services.
Does Qwen: Qwen3 4B (free) support reasoning?
Yes, Qwen: Qwen3 4B (free) supports reasoning capabilities, allowing it to show its step-by-step thought process.