01
What is a token? Count and compare tokenizers
Compare eight tokenizers on identical text. Learn why tokens differ from characters and why Chinese has no fixed conversion ratio.
UNDERSTAND · ESTIMATE · COMPARE
AI Tools: Token Counter, API Cost Calculator & Model Tests
Understand tokens, calculate API costs, compare model responses and inspect AI-generated images. Start with a practical guide, then use the matching tool to test your own workload.
02
API cost calculator: input, output and per-million pricing
Estimate costs using request count, input tokens and output tokens. Understand cache charges and dated provider rates.
03
GPT model quality tests: investigate degraded responses
Compare reproducible SVG and reasoning probes. Check output limits, context and protocol settings before attributing a failure to model quality.
04
AI image comparison: GPT Image, Nano Banana and Seedream
Inspect same-prompt examples for portraits, product images, Chinese text and multi-subject scenes. Evaluate task fit as well as cost.
05
JEV playground: classification, scoring and agent routing
Explore Choice, Noul and Score with customer-support and routing examples. Inspect structured results and interpret confidence carefully.
A practical path from tokens to model selection
- Understand tokens and context, then count your actual input.
- Estimate costs from request volume, output length and current rates.
- Compare relevant prompts and record failures, retries and latency.
- Evaluate image generation and structured decision models for their specific tasks.
Before you run a tool
Token counting and cost estimation need no API key. Recorded samples are free to inspect. Live model, image and JEV requests use your own key and may incur API charges. Token counts and dated samples do not guarantee future billing or model quality.