Cheapest & Free AI APIs for High-Volume Use (2026)
Updated April 2026 ยท Prices per 1M tokens ยท All sources linked ยท ไธญๆ
๐ฏ Who is this page for?
You need AI at scale but don't need frontier quality. Use cases: text classification, sentiment analysis, keyword extraction, summarization, translation, moderation, data enrichment, bulk processing. Also useful for prototyping, testing, and side projects where you want $0 cost.
๐ Free Model Aggregator Platforms
These platforms aggregate free models from multiple providers. One API key gives you access to dozens of free models. No credit card required.
| Platform | Free Models | Rate Limits | Highlights | Source |
|---|---|---|---|---|
| OpenRouter | 29 free models including Llama 4, GPT-oss, DeepSeek R1, Qwen3, GLM-4.5 Air, Mistral, Hermes 405B [1] | 20 RPM, 200 RPD per model | Largest free model selection; unified API; tools support | openrouter.ai |
| ็ก ๅบๆตๅจ SiliconFlow | DeepSeek V3/R1, Qwen3-8B/32B, GLM-4-9B, Llama 4 Scout [2] | 1000 RPM per model | Highest free RPM; ไธญๅฝ็ด่ฟ; OpenAI-compatible API | siliconflow.cn |
| Google AI Studio | Gemini 2.5 Flash, Flash-Lite, Gemma 3 [3] | 15-30 RPM, 1-2M TPM, 250 RPD | Best free quality; 1M context window; vision support | ai.google.dev |
| Groq | Llama 4 Scout/Maverick, Mixtral, Gemma 2 [4] | Free tier with limited RPM | Fastest inference (~100ms); real-time apps | groq.com |
| Cloudflare Workers AI | Llama 3.3, Mistral 7B, Phi-4 mini [5] | Free: 10K neurons/day | Edge inference; no cold start; global CDN | cloudflare.com |
| Mistral AI (La Plateforme) | Mistral Small, Codestral [6] | Free tier with rate limits | European data residency; good coding model | mistral.ai |
โญ Notable Free Models (via Aggregators)
These are the best free models available through aggregator platforms. All accessible with a single OpenRouter or SiliconFlow API key.
| Model | Available Free Via | Context | Capabilities | Best For |
|---|---|---|---|---|
| GPT-oss-120B | OpenRouter [1] | 131K | Tools | General Q&A, coding, agents |
| Hermes 3 Llama 3.1 405B | OpenRouter [1] | 131K | โ | Largest free model, strong reasoning |
| DeepSeek R1 | OpenRouter, SiliconFlow [1] | 128K | Reasoning | Chain-of-thought, math, coding |
| DeepSeek V3.2 | SiliconFlow [2] | 128K | โ | Best free quality for general tasks |
| Qwen3 32B | SiliconFlow, OpenRouter [2] | 128K | Tools | Multilingual, coding, Chinese tasks |
| GLM-4.5 Air | OpenRouter [1] | 128K | โ | Chinese tasks, general purpose |
| Llama 4 Scout (17B) | Groq, SiliconFlow [4] | 128K | โ | โก Fastest; real-time chat, agents |
| Gemini 2.5 Flash | Google AI Studio [3] | 1M | Vision | Longest free context; image understanding |
| Gemini 2.5 Flash-Lite | Google AI Studio [3] | 1M | โ | Highest free volume + 1M context |
| NVIDIA Nemotron Nano 12B | OpenRouter [1] | 8K | โ | Lightweight, fast, simple tasks |
| Liquid LFM 2.5 1.2B | OpenRouter [1] | 66K | โ | Ultra-lightweight; fastest free model |
๐ฐ Ultra-Cheap Paid APIs (Under $0.30/MTok input)
| Model | Provider | Input $/MTok | Output $/MTok | Context | Best For | Source |
|---|---|---|---|---|---|---|
| GPT-4.1 Nano | OpenAI | $0.10 | $0.40 | 1M | Classification, extraction, simple Q&A | openai.com |
| Gemini 3.1 Flash-Lite | $0.10 | $0.40 | 1M | Cheapest per-token with massive context | ai.google.dev | |
| Groq (Llama 4 Scout) | Groq | $0.11 | $0.34 | 128K | โก Fastest inference (~100ms), real-time apps | groq.com |
| DeepSeek V3.2 | DeepSeek | $0.14 | $0.28 | 128K | Best quality/price ratio, coding & reasoning | deepseek.com |
| Gemini 2.5 Flash | $0.15 | $0.60 | 1M | Great quality at budget price, long context | ai.google.dev | |
| DeepSeek R1 | DeepSeek | $0.55 | $2.19 | 128K | Cheapest reasoning model (chain-of-thought) | deepseek.com |
| o4 Mini | OpenAI | $0.55 | $2.20 | 200K | Reasoning tasks, coding, math | openai.com |
| Claude Haiku 3.5 | Anthropic | $0.80 | $4.00 | 200K | Budget Anthropic option, fast responses | anthropic.com |
๐ Real Cost Comparison: 10M Input Tokens + 5M Output Tokens
GPT-4.1 Nano$3.00
Gemini 3.1 Flash-Lite$3.00
Groq Llama 4$2.80
DeepSeek V3.2$2.80
Gemini 2.5 Flash$4.50
Claude Haiku 3.5$28.00
GPT-4o (for comparison)$37.50
๐ก Budget models cost 7-13ร less than GPT-4o for the same workload. For simple tasks, the quality difference is minimal.
๐ฏ Which Cheap Model for Which Task?
| Task | Recommended Model | Why | Est. Cost per 1M requests |
|---|---|---|---|
| Sentiment Analysis | GPT-4.1 Nano | Short input/output, simple classification | ~$1-3 |
| Keyword/Entity Extraction | Gemini Flash-Lite | Cheapest per-token, handles structured output | ~$2-5 |
| Translation (high volume) | DeepSeek V3.2 | Excellent multilingual at lowest cost | ~$5-15 |
| Summarization | Gemini 2.5 Flash | 1M context window, good quality | ~$5-20 |
| Content Moderation | Groq (Llama 4) | Sub-100ms latency for real-time | ~$3-8 |
| Data Enrichment | DeepSeek V3.2 | Good at structured data, cheapest | ~$5-15 |
| Email Auto-Reply | Claude Haiku 3.5 | Best tone/quality at budget price | ~$10-30 |
| Code Review (bulk) | DeepSeek V3.2 | Strong coding ability, very cheap | ~$10-25 |
๐ Self-Hosting: The Ultimate Cheap Option
For maximum volume at minimum cost, self-host open-weight models. You pay only for GPU rental โ no per-token fees.
| Model | Min VRAM | GPU Cost (est.) | Equivalent Per-Token |
|---|---|---|---|
| Llama 4 Scout (17B) | 24GB | ~$0.50/hr (A10G) | ~$0.001/MTok (effectively free) |
| Qwen3 14B | 16GB | ~$0.40/hr (T4) | ~$0.001/MTok |
| DeepSeek V3.2 (full) | 8รH100 | ~$16/hr | Only worthwhile at extreme scale |
| Gemma 3 4B | 8GB | ~$0.25/hr (T4) | Cheapest self-hosted option |
GPU costs from AWS/GCP/AWS spot pricing. Use vast.ai or runpod.io for cheaper community GPUs.
๐ Official Pricing Sources
- OpenRouter Free Models Collection โ 29 free models, no credit card
- ็ก ๅบๆตๅจ SiliconFlow ๅฎไปท โ 1000 RPM free, Chinese open-source models
- Google AI Studio Pricing (Gemini) โ Free Gemini Flash
- Groq Pricing โ Free tier with ultra-fast inference
- Cloudflare Workers AI Models โ Edge inference free tier
- Mistral AI Pricing โ Free tier for Mistral Small
- OpenAI API Pricing โ GPT-4.1 Nano at $0.10/MTok
- DeepSeek API Pricing โ V3.2 at $0.14/MTok
- Anthropic API Pricing โ Haiku 3.5 at $0.80/MTok
Prices reflect published rates as of April 2026. Free tier limits may change. Always verify on official pages.
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