Count tokens for GPT-6 Astra, GPT-5.6 Sol/Terra/Luna, Claude Fable 5.1, Opus 5.5, Opus 5, Sonnet 5, Haiku 4.5, and Gemini 3.8 Flash as you type. See current API pricing, remaining context, and chunk suggestions without leaving the browser.
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Token counting runs entirely in your browser via js-tiktoken — no data ever leaves this page. Prices are standard API rates in USD, checked 23 Sep 2026; batch and cached-input discounts aren't applied.
GPT-6 Astra · OpenAI
0 tokens
Context limit: 272,000
Prompts over 272K tokens bill at 2× input / 1.5× output.
GPT-5.6 Sol · OpenAI
0 tokens
Context limit: 272,000
Promotional price through 21 Nov 2026. Prompts over 272K tokens bill at 2× input / 1.5× output.
GPT-5.6 Terra · OpenAI
0 tokens
Context limit: 272,000
Prompts over 272K tokens bill at 2× input / 1.5× output.
GPT-5.6 Luna · OpenAI
0 tokens
Context limit: 272,000
Prompts over 272K tokens bill at 2× input / 1.5× output.
Claude Fable 5.1 · Anthropic
0 tokens
Context limit: 1,000,000
Estimated with o200k_base; this vendor's tokenizer isn't public.
Claude Opus 5.5 · Anthropic
0 tokens
Context limit: 1,000,000
Estimated with o200k_base; this vendor's tokenizer isn't public.
Claude Opus 5 · Anthropic
0 tokens
Context limit: 1,000,000
Estimated with o200k_base; this vendor's tokenizer isn't public.
Claude Sonnet 5 · Anthropic
0 tokens
Context limit: 1,000,000
Estimated with o200k_base; this vendor's tokenizer isn't public.
Claude Haiku 4.5 · Anthropic
0 tokens
Context limit: 200,000
Estimated with o200k_base; this vendor's tokenizer isn't public.
Gemini 3.8 Flash · Google
0 tokens
Context limit: 1,000,000
Introductory price through 31 Dec 2026 ($1.50 / $7.50 from 2027). Estimated with o200k_base; this vendor's tokenizer isn't public.