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The provider documentation behind the field guides. References explain the rules; your account determines the terms that actually apply.
How these sources are used. Official documentation supports provider-specific statements. Worked calculations and suggested evaluation processes are original editorial examples. This is not a live price feed, and a reviewed page does not guarantee that a policy will stay unchanged.
Some documentation describes rollout stages or account-specific exceptions. Check the actual console and applicable agreement when a general page cannot resolve your account’s situation. Provider names and links do not imply affiliation.
OpenAI · Prepaid API billing
Credit purchases, reload controls, expiration, and delayed balance updates.
Read the official documentation ↗CHECKED SEP 12, 2026OpenAI · ChatGPT and API billing separation
The separate billing systems for ChatGPT and the API platform.
Read the official documentation ↗CHECKED SEP 12, 2026OpenAI · Service credit terms
Issuer-specific conditions, including restrictions on purported transfers and sales.
Read the official documentation ↗CHECKED SEP 12, 2026OpenAI · Batch API
Asynchronous processing, supported use cases, and batch constraints.
Read the official documentation ↗CHECKED SEP 12, 2026Anthropic · Paying for Claude API usage
Direct Console funding, invoicing arrangements, reloads, and purchased-credit terms.
Read the official documentation ↗CHECKED SEP 12, 2026Anthropic · Claude subscription versus API access
Why a paid chat subscription does not replace direct API billing.
Read the official documentation ↗CHECKED SEP 12, 2026Anthropic · Claude API rate limits
The distinction between spending constraints and request or token throughput.
Read the official documentation ↗CHECKED SEP 12, 2026Anthropic · Prompt caching
Cache controls, usage components, and model-specific technical conditions.
Read the official documentation ↗CHECKED SEP 12, 2026Grok / xAI · API billing
Team-level prepaid credits, automatic top-ups, and invoiced spending.
Read the official documentation ↗CHECKED SEP 12, 2026Grok / xAI · Models and pricing
Model-specific pricing references and links to additional capabilities.
Read the official documentation ↗CHECKED SEP 12, 2026Google · Gemini API billing
Free-tier and paid access, Prepay and Postpay, and promotional-credit prerequisites.
Read the official documentation ↗CHECKED SEP 12, 2026Google · Gemini API pricing
Metering, model-specific rates, and applicable tier-related data-use information.
Read the official documentation ↗CHECKED SEP 12, 2026Google · Gemma open models
The Gemma model family and its deployment ecosystem.
Read the official documentation ↗CHECKED SEP 12, 2026Mistral · Activate Studio
Developer access, Free mode, and initial credential setup.
Read the official documentation ↗CHECKED SEP 12, 2026Mistral · Model documentation
Model families, licensing labels, and links to service-specific details.
Read the official documentation ↗CHECKED SEP 12, 2026DeepSeek · Context caching
Cache behavior, reported hit and miss usage, and best-effort limitations.
Read the official documentation ↗CHECKED SEP 12, 2026DeepSeek · Models and pricing
The current distinction between billable token components for available models.
Read the official documentation ↗CHECKED SEP 12, 2026DeepSeek · Chat completion reference
Usage response fields, output components, and request configuration.
Read the official documentation ↗CHECKED SEP 12, 2026Alibaba Cloud · Model Studio free quotas
Eligible regional scope, quota validity, and quota-only controls.
Read the official documentation ↗CHECKED SEP 12, 2026Alibaba Cloud · Model inference pricing
Model-, mode-, and region-specific inference pricing.
Read the official documentation ↗CHECKED SEP 12, 2026Alibaba Cloud · Billing and cost management
How different access plans and billing arrangements are distinguished.
Read the official documentation ↗CHECKED SEP 12, 2026Alibaba Cloud · Token Plan
A specific credit-based subscription, separate from generic tokenized-credit claims.
Read the official documentation ↗CHECKED SEP 12, 2026Google Cloud · AI startup program
Official eligibility, staged benefits, and award conditions.
Read the official documentation ↗CHECKED SEP 12, 2026