15+ free tools for AI developers. Calculate costs, compare models, optimize tokens, generate schemas, and more for GPT-5, Claude Opus 4.8, Gemini 3, Grok 4, Llama 4, and other LLMs.
Count tokens for different LLM models and calculate estimated costs for your prompts and responses.
Calculate costs across different LLM providers and models to optimize your budget.
Calculate costs for generating embeddings and storing vectors in databases like Pinecone and Weaviate.
Calculate savings using the Batch API — a 50% discount across OpenAI, Anthropic, and Google models.
Estimate training and inference costs for fine-tuning custom LLM models.
Compare features, pricing, and capabilities of GPT-5, Claude, Gemini 3, Grok, and other LLMs side-by-side.
Calculate and visualize context window usage for different LLM models.
Compare API latency and response times across different LLM providers and models.
Check if your usage fits within API rate limits for different LLM providers and tiers.
Interactive visualization showing how generative AI works from query to response, including RAG, embeddings, and reranking.
Generate JSON Schema from example JSON for OpenAI function calling and Claude tool use.
Reduce token usage and API costs by optimizing your prompts without losing meaning.
Production-ready system prompts for common LLM use cases. Copy and customize for your needs.
Visualize how your text will be chunked with different settings like top-k and temperature.
Build and test prompt templates with variable substitution and formatting.