⏰ Limited-Time Free Models
xAI’s entire Grok lineup is nearing the end of its free trial period, with most models expiring May 15 — just 2 days away. After expiration, pricing kicks in at competitive rates:
- Grok 4.1 Fast – 2M context, $0.2/$0.5 per M tokens (prompt/completion)
- Grok 4 Fast – 2M context, $0.2/$0.5 per M tokens
- Grok 4 – 256K context, $3/$15 per M tokens
- Grok Code Fast 1 – 256K context, $0.2/$1.5 per M tokens
- Grok 3 – 131K context, $3/$15 per M tokens
- Grok 3 Mini – 131K context, $0.3/$0.5 per M tokens
Also ending soon:
- Mistral 7B Instruct v0.1 – free until May 30 (15 days left), then $0.11/$0.19 per M tokens
- Gemini 2.0 Flash Lite – free until Jun 1 (17 days left), then $0.075/$0.3 per M tokens
🤗 Trending on Hugging Face
A clear theme emerged today: Gemma 4 fine-tunes for terminal/agent tasks dominate the trending list, led by the LLM-OS-Models team. All models are built on Gemma 4 and fine-tuned with a “Native Liquid” SFT approach:
- gemma-4-E4B-it-Terminal-SFT-Native-Liquid-1Epoch – 2,322 downloads, 3 likes ⭐
- gemma-4-E4B-it-Terminal-SFT-Native-Liquid-2Epoch – 2,333 downloads, 1 like
- gemma-4-E4B-Terminal-SFT-Native-Liquid-1Epoch – 2,292 downloads, 1 like
- gemma-4-E4B-Terminal-SFT-Native-Liquid-2Epoch – 2,298 downloads, 1 like
- gemma-4-E2B-Terminal-SFT-Native-Liquid-1Epoch – 2,318 downloads, 1 like
- gemma-4-E2B-Terminal-SFT-Native-Liquid-2Epoch – 2,281 downloads, 1 like
Other notable uploads include llama-3.1-8b-r1280-als-random-qres1 from jiogenes (exploring alternative activation scaling) and vlite-0.12B from aixk, a tiny 0.12B parameter vision-language model.
🚀 New Models on OpenRouter
Two new models hit OpenRouter today:
- Anthropic: Claude Opus 4.7 (Fast) – 1M context window, priced at $30/M tokens prompt. A speedy variant of Anthropic’s flagship reasoning model.
- Perceptron: Perceptron Mk1 – 32K context, priced at just $0.15/M tokens prompt. An ultra-budget option for lightweight inference.
⭐ GitHub Trending: AI Edition
Five AI-related repositories caught the community’s attention this week:
- huangserva/3DCellForge ⭐ 1,789 – JavaScript – AI-powered interactive 3D cell generation and exploration studio. The standout project of the day.
- alchaincyf/huashu-md-html ⭐ 510 – CSS – Bidirectional Markdown/HTML pipeline: everything to MD, MD to beautiful HTML, HTML to MD.
- simonlin1212/a-stock-data ⭐ 444 – A full-stack data toolkit for China A-Share market with 6-layer architecture, 15 endpoints, and 7 data sources.
- iam567/LifeManga ⭐ 327 – Swift – iOS app using GPT-4 image generation for AI manga creation.
- sunyouzhi2003/LSFG-Desktop ⭐ 324 – C++ – Lossless Scaling 2026 universal frame generation supporting X2/X3/X4 multipliers.
💡 Key Trends
Today’s AI landscape is defined by three themes. First, the terminal/agent fine-tuning wave — the LLM-OS-Models team’s Gemma 4 SFT variants dominated Hugging Face, signaling growing interest in specialized agent-oriented models. Second, xAI’s aggressive free-tier strategy is drawing developers into the Grok ecosystem before pricing kicks in on May 15. Third, AI is expanding into domain-specific tools — from 3D biology (3DCellForge) to stock market analytics (a-stock-data) — as open-source developers build purpose-built AI-powered applications across industries.