Billing & Credits Guide
Claude API
Anthropic's advanced AI assistant. Safe, powerful, and trustworthy.
What We Track
Validation
API key validity status
Models
Available models count
Organization
Organization ID
Key Format
API Key
sk-ant-...Anthropic API key, starts with sk-ant-
API Pricing (per 1M tokens)
| Model | Input | Output | Best For |
|---|---|---|---|
| Haiku | $1/M input | $5/M output | Fastest model |
| Sonnet | $3/M input | $15/M output | Balanced intelligence |
| Opus | $5/M input | $25/M output | Most intelligent |
Popular Models
Claude 4.6 Opus
Most intelligent model
Claude 4.6 Sonnet
Optimal balance
Claude 4.5 Haiku
Fastest & cheapest
Claude 4.5 Sonnet
Previous generation