Anthropic Claude Token Counter & Cost Calculator (Claude 3.7 / 3.5 Sonnet & Haiku)
Estimate Claude BPE token counts, 200K context usage, and 90% Prompt Caching read discounts for Claude 3.7 Sonnet, 3.5 Sonnet, and Haiku.
How do I use Anthropic Claude Token Counter & Cost Calculator (Claude 3.7 / 3.5 Sonnet & Haiku)?
Notice the tool is pre-filtered to 'Anthropic (Claude BPE)' with an XML-structured `<system_instructions>` + `cache_control` sample prompt and 90% cache hit ratio.
Paste your Claude system prompt, XML tags, or codebase context into the editor.
Use the 'Prompt Cache Hit Ratio' selector in the sidebar to see how Anthropic's 90% cached read discount ($0.30/1M vs $3.00/1M) transforms long-context costs.
Compare Input, Cached Read, and Output costs across Claude 3.7 Sonnet, Claude 3.5 Sonnet, and Claude 3.5 Haiku.
What features does Anthropic Claude Token Counter & Cost Calculator (Claude 3.7 / 3.5 Sonnet & Haiku) offer?
Pre-filtered to Anthropic's Claude lineup: `Claude 3.7 Sonnet`, `Claude 3.5 Sonnet`, and `Claude 3.5 Haiku`
Models Anthropic's industry-leading **90% Prompt Caching read discount** (`$0.30/1M` on Sonnet)
Pre-loaded with an Anthropic best-practice XML `<system_instructions>` prompt with `<cache_control type="ephemeral" />`
Tracks 200,000-token context window utilization in real time as you type
Supports multimodal image token estimation via the sidebar slider
100% Client-Side execution: confidential codebase context and prompts stay in your browser
Anthropic Claude 3.7 / 3.5 Pricing & Prompt Caching Economics
Anthropic's explicit `cache_control: { type: 'ephemeral' }` breakpoints reduce cached input read costs by 90% ($0.30/1M instead of $3.00/1M on Claude 3.7/3.5 Sonnet).
Cached Read Rate = 0.10 × Base Input Rate ($0.30 / 1M tokens on Claude Sonnet)Minimum cacheable prompt prefix is 1,024 tokens for Claude 3.7/3.5 Sonnet and 2,048 tokens for Claude 3.5 Haiku.
| Anthropic Model | Base Input / 1M | Cache Read / 1M (90% Off) | Output / 1M Tokens | Max Context Window |
|---|---|---|---|---|
| Claude 3.7 Sonnet | $3.00 | $0.30 | $15.00 | 200,000 tokens |
| Claude 3.5 Sonnet | $3.00 | $0.30 | $15.00 | 200,000 tokens |
| Claude 3.5 Haiku | $0.80 | $0.08 | $4.00 | 200,000 tokens |
How is Anthropic Claude Token Counter & Cost Calculator (Claude 3.7 / 3.5 Sonnet & Haiku) used in real-world workflows?
Calculating 90% Cache Savings on Multi-Turn Codebase Chats
When building coding agents on Claude 3.7 Sonnet, caching a 50,000-token repository tree drops each turn's input cost from $0.15 to $0.015.
Measuring XML Tag & Few-Shot Example Token Budgets
Ensure your `<system_instructions>` and `<examples>` blocks exceed the 1,024-token minimum required for Claude `ephemeral` cache breakpoints.
Monitoring 200K Context Window Saturation
Check what percentage of Claude's 200,000-token context window is consumed by your retrieved document chunks before hitting `max_tokens` limits.
Frequently Asked Questions about Anthropic Claude Token Counter & Cost Calculator (Claude 3.7 / 3.5 Sonnet & Haiku)
What is the minimum token length to enable Prompt Caching in Claude?
Anthropic requires a minimum cacheable prefix of **1,024 tokens** on Claude 3.7 Sonnet and Claude 3.5 Sonnet, and **2,048 tokens** on Claude 3.5 Haiku. Prompts shorter than those thresholds cannot be cached even if `cache_control` is specified.
How much does Anthropic charge for cache writes vs. cache reads?
Writing a new cache entry costs 25% more than the base input rate ($3.75/1M on Sonnet) with a 5-minute TTL (refreshed on each hit), while every subsequent cache read costs **90% less** than the base input rate ($0.30/1M on Sonnet).
Does Claude use the same `tiktoken` tokenizer as OpenAI?
No. Anthropic uses its own custom BPE tokenizer (~65K vocabulary). In English and source code, Claude token counts typically fall within 3%–8% of `o200k_base`, and XML tags like `<context>` tokenize cleanly.
Is my Claude prompt uploaded to any server?
No. All token counting and cost calculations run 100% locally in your browser.
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