ernd guides
Guides to AI API costs
How OpenAI and Anthropic price and bill their APIs, and how teams track and cut that spend. Every fact links to the provider's own page.
Guides
4 pages
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How to cut LLM API costs
Ways to lower OpenAI and Anthropic API bills with smaller models, prompt caching, batch jobs, flex processing, shorter outputs and spend limits.
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How OpenAI and Anthropic API billing works
How OpenAI and Anthropic bill API usage. Prepaid credits, auto-reload, usage tiers, spend limits, invoices, receipts and tax, checked October 27, 2026.
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How to track AI API spend
Track OpenAI and Anthropic API spend with usage dashboards, cost APIs, per-project keys, spend alerts and receipts, then reconcile it in your accounts.
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AI credits programs for startups, compared
How startup credits from OpenAI, Anthropic, AWS, Google Cloud and Microsoft compare on amounts, who qualifies, expiry and which AI models they pay for.
Pricing and tools
3 pages
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OpenAI API pricing per million tokens
OpenAI API prices per 1M tokens for GPT-6 and GPT-5.6 models, with cached input, Batch, Flex and Fast mode rates, as listed on October 27, 2026.
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Anthropic API pricing per million tokens
Claude API prices per million tokens for Opus, Sonnet, Haiku and Fable models, with cache, Batch and fast mode rates, as listed on October 27, 2026.
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AI API cost calculator for OpenAI and Anthropic
Estimate a month of OpenAI or Anthropic API spend from token counts, at list prices checked October 27, 2026. Examples only, not a quote.
More on billing and pricing is on the ernd blog.
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The ernd card
The ernd card is a charge card for US companies, with partners across the AI stack built in.
Request your card