Open formula. Browser-based calculations. Source-dated rates. No API keys. No provider login. No tracing SDK. No account required. Input payloads are not stored.
Pricing source date: 2026-05-28 · Build verification: 2026-05-28 · Stale threshold: 30 days. This is a tokenizer-sizing tool; results depend on the tokenizer behavior of the target model and the output-token reserve you enter, not on provider price rows. Confirm tokenizer behavior for the model you plan to use, since tokenization can differ across providers and model versions.
Estimates prompt and output-token budget before provider pricing is applied. This is table-stakes input hygiene for all downstream Model Ruler cost calculators.
Formula
estimated_input_tokens = tokenizer_family_estimate(text_bytes); total_planning_tokens = estimated_input_tokens + expected_output_tokens
Primary source register
Tokenizer behavior differs by provider and model. Treat this as a planning estimate and verify exact tokenization with the target provider before contractual commitments.
- https://openai.com/pricing
- https://www.anthropic.com/pricing
- https://platform.claude.com/docs/en/about-claude/pricing
- https://platform.claude.com/docs/en/about-claude/models/overview
- https://cloud.google.com/vertex-ai/generative-ai/pricing
- https://www.together.ai/pricing
- https://replicate.com/pricing
- https://fireworks.ai/pricing
- https://groq.com/pricing
- https://deepinfra.com/pricing
- https://aws.amazon.com/bedrock/pricing/
- https://azure.microsoft.com/pricing/details/cognitive-services/openai-service/
Included assumptions
- text byte count
- tokenizer-family heuristic
- expected output-token reserve
Excluded assumptions
- provider-specific tokenizer edge cases
- cached-token discounts
- system prompts not entered by the user
Architecture-cost audit
Context growthDocument tokens, system overhead, output reserve, and cumulative context requirements.
Diagnostic output
This tool returns Cost classification, Dominant cost driver, Decision threshold, and Sensitivity. Diagnostic focus: Token budget pressure and downstream provider-cost sensitivity..
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