Free LLM APIs are often advertised, but in practice many come with hard limitations, unstable access, or unclear usage terms. As of now, there are only a small number of models that are genuinely free, publicly accessible, and usable for real testing or early-stage development.
Below are four LLM APIs currently available for free on OpenQiao. All four can be accessed through a unified API, making them easy to evaluate and compare without managing multiple providers or SDKs.
1. Google Gemini 3 Flash Preview (Free)
- Model ID:
google/gemini-3-flash-preview-free - Provider: Google
- Status: Free (with rate limits)
Gemini 3 Flash Preview is Google’s low-latency model in the Gemini 3 family, optimized for fast response times and high-throughput inference. While positioned as a preview model, it retains the core multimodal and reasoning capabilities of Gemini 3.
Built on the same architecture as Gemini 3 Pro, this model supports native multimodal inputs, including text, images, and audio. It also benefits from the improved long-context handling introduced in the Gemini 3 generation.
This free version is available for use in Studio Chat and API testing, though it may be temporarily unavailable during peak usage and is subject to rate limits. For applications that prioritize speed and cost efficiency over guaranteed uptime, Gemini 3 Flash Preview is a practical option.
Best for:
- Real-time applications
- Latency-sensitive workloads
- Early-stage Gemini 3 evaluation
2. Xiaomi MiMo-V2-Flash (Free)
- Model ID:
xiaomi/mimo-v2-flash-free - Provider: Xiaomi
- Status: Free
MiMo-V2-Flash is an open-source foundation model developed by Xiaomi. It uses a Mixture-of-Experts architecture with 309B total parameters and 15B active parameters, combined with a hybrid attention design.
The model supports a hybrid reasoning toggle and a large 256K context window. It performs particularly well in reasoning, coding, and agent-based scenarios.
Best for:
- Long-context tasks
- Code generation
- Reasoning-heavy workflows
- Agent systems
3. Z.AI GLM-4.6V Flash (Free)
- Model ID:
z-ai/glm-4.6v-flash-free - Provider: Z.AI
- Status: Free
GLM-4.6V-Flash supports visual and textual inputs and includes native function calling, making it suitable for multimodal agent scenarios even in the free tier.
Best for:
- Multimodal understanding
- Vision-based tasks
- Agent pipelines with function calling
4. KwaiKAT KAT-Coder-Pro V1 (Free)
- Model ID:
kuaishou/kat-coder-pro-v1-free - Provider: Kuaishou
- Status: Free (limited-time)
KAT-Coder-Pro V1 is a coding-focused model designed for autonomous agent workflows and complex software engineering tasks.
Best for:
- AI coding and code review
- Autonomous agent workflows
- Complex task execution with tool usage
Final Thoughts
Truly usable free LLM APIs are rare. These four models offer a solid, no-cost way to explore modern LLM capabilities before committing to paid plans.