AiHubMix Documentation Hub

Free AI APIs are the fastest way to ship AI features in 2026 — but most “free” platforms come with credit cards, trial expiries, or surprise usage caps. AIHubMix takes a different approach: a unified, OpenAI-compatible gateway with 27+ genuinely free LLM and image generation models subsidized by the platform, including OpenAI’s GPT-5.5, GPT-Image-2, Google’s Gemini 3, Zhipu GLM-5.1, Kimi, MiniMax, and Xiaomi MiMo. No credit card. No trial expiry. One API key, every major model.

🚀 Latest Update: GPT-5.5 and GPT-Image-2 Now are Free

AIHubMix is dedicated to securing maximum value for its users. In this update, the free versions of two of OpenAI’s latest flagship models — GPT-5.5 and GPT-Image-2 — are officially live. Since OpenAI’s official API does not offer free access to these models, AIHubMix continues to invest in subsidizing inference costs, lowering the barrier to entry for top-tier models to zero. GPT-5.5-free A comprehensive upgrade in reasoning depth, agent orchestration, tool use, code generation, and data analysis — currently OpenAI’s most capable available model overall. Free access on AIHubMix is the fastest way to compare GPT-5.5 against Claude Opus 4.6, Gemini 3.1 Pro, and GLM-5.1 without paying per token. GPT-5.5-free API Usage Examples

import openai

client = openai.OpenAI(
    api_key="<AIHUBMIX_API_KEY>",  # Replace with the key generated in AIHubMix
    base_url="https://aihubmix.com/v1"
)

response = client.chat.completions.create(
    model="gpt-5.5-free",  # The reasoning depth of the model defaults to medium
    messages=[
        {"role": "user", "content": "Hello, how are you?"}
    ],
    temperature=0.7  # Default is 1
)

print(response.choices[0].message.content)

GPT-Image-2-free Product photography, posters, avatars, illustrations, e-commerce assets, social media graphics, livestream thumbnails — all mainstream image generation use cases covered in one call, with output quality at commercial-grade level. The first OpenAI image model with built-in reasoning and ~99% character-level text rendering accuracy across Latin, CJK, Hindi, and other scripts. API Usage Examples

import base64

from openai import OpenAI

client = OpenAI(
    api_key="<AIHUBMIX_API_KEY>",  # Replace with the key generated in AIHubMix
    base_url="https://aihubmix.com/v1"
)

response = client.images.generate(
    model="gpt-image-2-free",
    prompt="A vase of flowers on a table, with intense contrasting colors and thick, expressive brushstrokes. Render the image so it looks painted in Fauvist style.",
    n=1,           # Number of images to generate, supports 1-10
    size="auto",   # Image size: 1024x1024, 1024x1536, 1536x1024, 4096x4096, auto (default)
    quality="auto" # Image quality: high, medium, low, auto (default)
)

image_bytes = base64.b64decode(response.data[0].b64_json)
with open("output.png", "wb") as f:
    f.write(image_bytes)

New User Bonus: After signing up, get 10 free calls each to free models including GPT-5.5 and GPT-Image-2. Top up to unlock more quota. Paying users: receive an additional 10 calls and a million-token top-up.

Why Use Free AI APIs in 2026?

Free AI model APIs unlock four concrete benefits that paid-only access cannot match:

Side-by-side model evaluation — Compare GPT-5.5, Claude Opus 4.6, Gemini 3.1 Pro, GLM-5.1, and Kimi on the same prompts before committing to a paid plan.
Zero-cost prototyping — Build proof-of-concept agents, chatbots, and automation pipelines without burning your credit card during the discovery phase.
Cost-aware production routing — Route low-stakes traffic (batch summarization, log analysis, draft generation) to free models while reserving paid quota for revenue-critical paths.
Hobbyist and student access — Indie developers, students, and side-project builders gain access to frontier models that would otherwise cost hundreds per month.

The catch with most “free LLM API” providers is fragmentation: Google AI Studio gives you Gemini, Groq gives you Llama, OpenRouter gives you a different mix every week, and each requires a separate account, API key, and rate-limit strategy. AIHubMix consolidates 27+ free models behind one OpenAI-compatible endpoint with automatic provider failover — drop-in replacement for any existing OpenAI SDK call.

Complete Free Model Catalog (27+ Models, May 2026)

AIHubMix currently offers 27+ free models spanning major providers including OpenAI, Google, Zhipu, Kimi, MiniMax, and Xiaomi — and the lineup keeps growing as new models ship.

General-Purpose Chat & Reasoning Models

Covering the GPT-4o and GPT-4.1 families plus Gemini Flash and domestic flagships — suited for everyday Q&A, content generation, document analysis, and multilingual chat. gpt-4o-free supports mixed text-and-image input, gemini-3-flash-preview-free offers ultra-long context (1M+ tokens), and the rest balance speed and capability differently.

Model	Context	Highlights
gpt-4o-free	128K	Multimodal, vision-capable
gpt-4.1-free	1M	Complex instruction following, long-form generation
gpt-4.1-mini-free	1M	Balanced speed and capability
gpt-4.1-nano-free	1M	Lightweight, high-frequency tasks
gemini-3-flash-preview-free	1M+	Ultra-long context, multimodal input
glm-4.7-flash-free	128K	Fast response, multilingual support
mimo-v2-flash-free	128K	Low-latency conversation
ling-2.6-flash-free	128K	Strong contextual coherence

Free Coding Models (Largest Category)

The deepest category in the free tier — bringing together specialized coding model series from Kimi, MiniMax, Zhipu GLM, and Qwen. If you’re searching for a free GitHub Copilot alternative or a free Cursor backend, this is where to start.

Model	Strength
kimi-for-coding-free	Multi-file context, refactoring, debugging
k2.6-code-preview-free	Algorithmic and systems-level code
coding-minimax-m2-free	MiniMax coding series
coding-minimax-m2.1-free	MiniMax coding series
coding-minimax-m2.5-free	MiniMax coding series
coding-minimax-m2.7-free	Latest MiniMax coding release
coding-glm-4.6-free	GLM coding series
coding-glm-4.7-free	GLM coding series
coding-glm-5-free	GLM-5, 745B MoE, Claude Opus 4.5 parity
coding-glm-5-turbo-free	GLM coding accelerated edition
coding-glm-5.1-free	#1 on SWE-bench Pro (58.4%)
step-3.5-flash-free	Lightweight completion, low latency

Free Image Generation Models

GPT-Image-2-free OpenAI’s next-generation image generation model released in April 2026, and its first image model with built-in reasoning. Before generating, it automatically plans composition, retrieves visual references from the web, and self-checks output — yielding noticeably better quality than GPT Image 1.5. Supports up to 4096×4096 resolution, generates roughly 2× faster than GPT Image 1.5, and produces up to 8 stylistically consistent images from a single prompt. Text rendering is a particular strength — covering Latin, CJK, Hindi, and other scripts with character-level accuracy of about 99%, making it ideal for posters, marketing assets, UI prototypes, and any scenario requiring precise typography. gemini-3.1-flash-image-preview-free (Nano Banana 2) Released by Google DeepMind in February 2026, combining Pro-level image quality with Flash-level speed — generating a 4K image in just 4–6 seconds. Unlike traditional image models, Nano Banana 2 integrates directly into the standard Chat Completions API, with no separate image endpoint required. Just describe what you need in conversation to generate an image, and continue editing across turns — for example, generate a product shot first, then change the background to a sunset scene with a single sentence. It also supports real-time visual grounding from the web, accurately rendering specific landmarks, branded products, and other real-world objects.

Free Agent & Reasoning Models

Xiaomi’s MiMo series is purpose-built for complex reasoning, function calling, and tool use — well-suited to autonomous agent workflows that require multi-step planning and chained tool execution.

Model	Highlights
xiaomi-mimo-v2-pro-free	Advanced reasoning, function calling, 1T+ params
xiaomi-mimo-v2.5-free	1.02T params, 42B active, 1M context, 1000+ tool calls

Top 5 Free Models on AIHubMix 🔥

coding-glm-5.1-free — Best Free Coding Model

Released by Zhipu AI in April 2026 with around 754B parameters. GLM-5.1 became the first open-source model to top SWE-bench Pro at 58.4% — surpassing GPT-5.4 (57.7%), Claude Opus 4.6 (57.3%), and Gemini 3.1 Pro (54.2%). Across 12 benchmarks covering reasoning, coding, agents, tool use, and browsing, it shows a balanced capability profile suited to demanding developer workflows. Via AIHubMix, it’s a drop-in upgrade for any Cursor, Cline, Aider, or Claude Code setup at zero cost.

coding-glm-5-free — Open-Source Code Powerhouse

GLM-5.1’s predecessor: a 745B-parameter MoE architecture (44B active), released February 2026. Scored 77.8% on SWE-bench Verified, achieving open-source state-of-the-art on agent coding leaderboards including Terminal Bench 2.0, with overall coding ability on par with Claude Opus 4.5.

gpt-4.1-free `Hot` — Best Free 1M-Context Model

Context 1M · Latency 0.529s · Throughput 72 TPS · Free input and output

OpenAI’s next-generation flagship released April 2025. Comprehensively surpasses GPT-4o on coding and instruction following — 54.6% SWE-bench Verified, 87.4% IFEval. The 1M ultra-long context is uniquely suited to large-scale document analysis, codebase understanding, and complex agent workflows. The free version is hosted on Azure, offering fast response and high stability.

xiaomi-mimo-v2-pro-free `New` — Best Free Agent Model

Context 256K · Latency 1.673s · Throughput 41 TPS · Free input and output

Xiaomi’s large reasoning model — MoE architecture with over 1T total parameters and roughly 42B active during inference. Ranked 8th on the global Intelligence Index (2nd among Chinese models). Coding capability surpasses Claude Sonnet 4.6, and overall agent capability approaches Opus 4.6 — making it a strong pick for complex code generation and long-chain multi-tool workflows.

xiaomi-mimo-v2.5-free — Strongest Free Open Reasoning Model

The current top of the MiMo series, with an Artificial Analysis Intelligence Index score of 54. Built on a hybrid-attention MoE architecture (1.02T total / 42B active) with a 1M-token context window. Improves comprehensively over V2-Pro on general agent capability, complex software engineering, and long-horizon tasks — supporting agent workflows with 1,000+ tool calls in a single session.

AIHubMix vs Openrouter

Which Free AI API Should You Pick? If you’ve searched “free AI API,” “OpenRouter alternative,” or “free Claude API,” you’ve likely seen a fragmented landscape. OpenRouter is the most-cited name in this category, but its free tier and AIHubMix’s free tier solve fundamentally different problems — one optimizes for breadth of open-source models, the other for access to frontier proprietary models without paying.

Where OpenRouter wins

Open-source variety — if your work centers on DeepSeek, Llama 3.3, Qwen, or fine-tuned community models, OpenRouter’s catalog is broader.
Random free-model routing — the openrouter/free virtual model picks any available free open-source model, useful for cheap fallback chains.
Long-standing brand recognition in the indie OSS community.

Where AIHubMix wins

Free access to closed-source frontier models — GPT-5.5, GPT-Image-2, Gemini 3, and Claude-class capability via GLM-5.1 are usable at $0. OpenRouter’s free tier deliberately excludes these.
Native Claude Code integration — AIHubMix exposes both /v1/chat/completions (OpenAI format) and /v1/messages (Anthropic format with anthropic-beta and anthropic-version header forwarding). Drop in via ANTHROPIC_BASE_URL with no proxy or translation layer.
Image generation in the same gateway — call GPT-Image-2 or Nano Banana 2 with the same API key you use for chat.
Multi-provider failover per model — when one upstream throttles or degrades, requests transparently re-route, raising your effective ceiling beyond what a single-upstream gateway delivers.
Higher cumulative free quota — daily caps spread across 27+ models, not a single 200-request bucket.

When to pick AIHubMix: you want OpenAI/Anthropic/Google flagship models for free, a single OpenAI-compatible endpoint, and image generation in the same gateway. When to pick OpenRouter: you only need open-source models (Llama, DeepSeek, Qwen, Gemma) and prefer the broadest open-source catalog over frontier proprietary access.

How to Get a Free AI Model API Key (3 Steps)

The full flow for accessing free models via AIHubMix:

Sign up at aihubmix.com — email or OAuth, no credit card.
Create an API key on the API Keys page. Format: sk-...
Pick a model from the free model catalog and start calling.

Use Cases & Integrations

Free Models in Claude Code (Anthropic CLI)

Claude Code is Anthropic’s official AI coding CLI, now a core part of many developer workflows. With a one-line environment variable, you can route Claude Code through AIHubMix and use any free coding model as the backend — no Anthropic billing required.

export ANTHROPIC_BASE_URL="https://aihubmix.com"
export ANTHROPIC_AUTH_TOKEN="sk-YOUR_KEY"
claude

Practical routing strategy: hand off everyday code generation to kimi-for-coding-free or coding-glm-5.1-free, use gpt-4.1-free for documentation and comments, and let xiaomi-mimo-v2-pro-free handle planning and orchestration of complex tasks. The full dev-assist pipeline runs at zero inference cost. See the Claude Code integration docs for setup details — also available directly on Claude Desktop.

Free Models in Cursor, Cline, Aider, and Other AI Coding Editors

Any AI coding editor that supports a custom OpenAI-compatible endpoint works with AIHubMix free models. Configure https://aihubmix.com/v1 as the base URL and pick a *-free model — drop-in replacement for paid GPT-5 or Claude usage in IDE assistants.

Free Models in AI Agents & Autonomous Workflows

OpenClaw — open-source autonomous AI agent platform released November 2025, currently with 3.2M+ users. Supports nearly every mainstream messaging channel — WhatsApp, Telegram, Slack, Discord — letting AI agents execute tasks directly inside platforms users already work in. Through AIHubMix, both xiaomi-mimo-v2-pro-free and coding-glm-5.1-free work seamlessly as backend models with full support for function calling, multi-turn context, and structured output. Hermes Agent — NousResearch’s agent framework, deeply optimized for tool use and structured JSON output. Its execute_code tool compresses multi-step pipelines into a single inference call, dramatically reducing round trips. Ideal for automation pipelines requiring strict JSON output — AIHubMix’s automatic rate-limit rotation across providers ensures long-running tasks aren’t interrupted when a single provider hits its quota.

Free Models with Open-Source Clients

AIHubMix is an officially supported API provider for several popular open-source applications:

Desktop chat clients — Cherry Studio is one of the most popular local AI chat clients, with a clean UI and convenient multi-model management. Select AIHubMix as the API provider to use GPT-4.1, Gemini Flash, GLM-5.1, and other free models in a desktop chat interface.
Multi-model proxy & translation — LiteLLM provides unified call management and load balancing across multiple free models; NextAI Translator supports free models for high-quality multilingual translation.
MCP / IDE integrations — Claude Desktop, Continue, Open WebUI, and any tool that accepts an OpenAI-compatible endpoint.

Rate Limits & Free Quota

Free models on AIHubMix operate under per-model rate limits expressed as requests per minute (RPM) and daily token caps. Specifics are listed on each model’s page at aihubmix.com/models. Compared to single-provider free tiers:

More headroom than OpenRouter — multiple providers backing each model, with automatic failover when one upstream throttles.
Higher cumulative ceiling than Google AI Studio — instead of 1,500 req/day on a single model, AIHubMix lets you spread traffic across 27+ free models.
No surprise expiry — quotas reset daily; no 30-day trial cliff.

For production traffic, the recommended pattern is paid quota for the critical path, free models for auxiliary workloads (batch summarization, log enrichment, draft generation, non-revenue-critical features).

FAQ

Q: Why choose AIHubMix over OpenRouter, AIMLAPI, or Google AI Studio? A: AIHubMix offers a unified OpenAI-compatible API aggregating 500+ global models including 27+ continuously updated free models — and unlike OpenRouter, the free tier includes frontier proprietary models like GPT-5.5, GPT-Image-2, and Gemini 3 (not just open-source). Paid models are priced more competitively. The platform is officially operated by AIHubMix, LLC (USA) with formal authorization from major cloud vendors — making it trustworthy on both stability and compliance. Q: Do I need a credit card to use AIHubMix free models? A: No. Sign up with email or OAuth, create an API key, and start calling. Free models are usable immediately without any payment method on file. Q: Do free models on AIHubMix have a time limit or trial expiry? A: No trial expiry. Free models remain available within their respective per-minute and daily quotas indefinitely. Limits are expressed as RPM and daily token caps — see each model’s page for specifics. Q: Which free model offers the strongest overall coding capability? A: As of May 2026, coding-glm-5.1-free leads — its 58.4% SWE-bench Pro score surpasses GPT-5.4 (57.7%), Claude Opus 4.6 (57.3%), and Gemini 3.1 Pro (54.2%), making it the first open-source model to top the SWE-bench Pro leaderboard. kimi-for-coding-free particularly excels at multi-file context understanding and code refactoring. Q: Are AIHubMix free models suitable for production? A: For moderate production traffic, yes — with careful quota planning. AIHubMix’s automatic failover balances load across multiple providers, increasing effective available quota. For higher-traffic production scenarios, run core inference on paid quota and route auxiliary work (batch summarization, log analysis, non-critical paths) to free models for a cost/stability balance. Q: Can I use AIHubMix free models with the OpenAI Python or Node.js SDK? A: Yes — AIHubMix is fully OpenAI-compatible. Set base_url to https://aihubmix.com/v1 and use any official OpenAI SDK, LangChain integration, LlamaIndex pipeline, or AI gateway. No code rewrite required. Q: Does AIHubMix support free image generation APIs? A: Yes. Free image generation includes GPT-Image-2 (OpenAI’s first reasoning-capable image model, up to 4096×4096) and Nano Banana 2 (gemini-3.1-flash-image-preview-free, 4K in 4–6 seconds). Both are accessed through standard chat-completions or image endpoints — no separate billing or quota system.

Get Started Today

Ready to ship AI features without burning your runway? Sign up at aihubmix.com, grab a free API key, and start calling 27+ frontier models in minutes. For deeper integration guides, model performance specs, quota details, and SDK examples, see the AIHubMix official documentation. The complete free model catalog lives at aihubmix.com/models. Related guides: Claude Code setup · Cherry Studio integration · LiteLLM gateway · OpenClaw agent platform · Hermes Agent for structured output

References & Sources

Last updated: May 7, 2026

Documentation Index

​🚀 Latest Update: GPT-5.5 and GPT-Image-2 Now are Free

New User Bonus: After signing up, get 10 free calls each to free models including GPT-5.5 and GPT-Image-2. Top up to unlock more quota. Paying users: receive an additional 10 calls and a million-token top-up.

​Why Use Free AI APIs in 2026?

​Complete Free Model Catalog (27+ Models, May 2026)

​General-Purpose Chat & Reasoning Models

​Free Coding Models (Largest Category)

​Free Image Generation Models

​Free Agent & Reasoning Models

​Top 5 Free Models on AIHubMix 🔥

​coding-glm-5.1-free — Best Free Coding Model

​coding-glm-5-free — Open-Source Code Powerhouse

​gpt-4.1-free Hot — Best Free 1M-Context Model

​xiaomi-mimo-v2-pro-free New — Best Free Agent Model

​xiaomi-mimo-v2.5-free — Strongest Free Open Reasoning Model

​AIHubMix vs Openrouter

​Where OpenRouter wins

​Where AIHubMix wins

​How to Get a Free AI Model API Key (3 Steps)

​Use Cases & Integrations

​Free Models in Claude Code (Anthropic CLI)

​Free Models in Cursor, Cline, Aider, and Other AI Coding Editors

​Free Models in AI Agents & Autonomous Workflows

​Free Models with Open-Source Clients

​Rate Limits & Free Quota

​FAQ

​Get Started Today