Anthropic API Pricing (2026): Every Claude Model Per Million Tokens, and What a Real Workload Costs

TL;DR: The Rate Table Is the Easy Part

Every "Anthropic API pricing" page on the internet is a copy of Anthropic's table with ads around it. The table is below, read straight from Anthropic's pricing page on the date at the top of this post, because I'd rather you get the number from me than from a page that hasn't been updated since spring. But the table isn't the bill. The bill is the table times your token mix, times whether you cache, times which generation of model you're on — and those three multipliers move the number more than the choice between vendors does. I run production workloads on this API for clients; here's the whole picture.

Anthropic API pricing per million tokens (September 2026)

Legacy Opus 4.1 and Opus 4 are still listed at $15 / $75 — if you're on either, you're paying three times the current Opus price for an older model. The Batch API is 50% off input and output on every model. Fast mode on Opus 5 and Opus 4.8 is a separate, premium rate of $10 / $50. Prices are Anthropic's published US list rates as of September 2026; the cloud marketplaces (AWS, Microsoft Foundry) bill in their own units. Check the source page before you sign anything with a zero on the end.

Is the Claude API free?

No. Anthropic's pricing page lists no free API tier, and the API is pay-per-token from the first call. The thing that's free is the consumer chat at claude.ai, which is a different product with different limits. The practical version of "free": at Haiku 4.5's $1 per million input tokens, a thousand test requests with a 2,000-token prompt cost about $2. Evaluation is not where the money goes.

The price cut that was supposed to expire, and didn't

Sonnet 5 launched at $2 / $10 as "introductory pricing through August 31, 2026," with a scheduled increase to $3 / $15 on September 1. As of September 2026, Anthropic's page says the increase will not occur — $2 / $10 is now the standard price. That's a third off the previous Sonnet generation's rate for the newer model, and it changes the default I give clients: Sonnet 5 is now the cheapest mid-tier frontier model I'm aware of, and for most business workloads it's the one to start on. If someone quotes you Sonnet at $3 / $15, they're reading the old row.

The tokenizer gotcha: 4.7 and later count ~30% more tokens

Here's the line on Anthropic's page that nobody puts in their pricing roundup: Claude 4.7 and later models use a newer tokenizer that produces approximately 30% more tokens for the same text. The exact figure depends on the content. Sonnet 4.6 and earlier use the previous tokenizer. Why it matters: a per-token price comparison across generations understates the newer models' cost by roughly that much. Sonnet 5 at $2 with 30% more tokens bills like Sonnet 4.6 at about $2.60 — still cheaper than 4.6's $3, but not the 33% cut the sticker implies. Measure your real token counts before you build a budget on the table. I've watched two clients miss this and wonder why the migration "saved" less than the spreadsheet said.

Prompt caching: the math that decides whether you pay $120 or $66

Caching is the biggest lever on an Anthropic bill and the one most builders leave off. The pricing, as of 2026: a 5-minute cache write costs 1.25x the base input price, a 1-hour write costs 2x, and a cache hit costs 10% of base input. On Sonnet 5 that's $2.50 per million to write, $0.20 per million to read. If your requests share a stable prefix — a system prompt, a policy document, a product catalog, few-shot examples — every request after the first reads that prefix at a tenth of the price. The write premium pays for itself on the second hit.

What three real workloads actually cost

These are the shapes I see most in owner-led businesses, priced on the September 2026 table. Token counts are the assumptions, so swap in yours.

1. Support bot: 10,000 responses a month, 4,000 tokens in (3,000 of it a stable system prompt and knowledge base), 400 tokens out. That's 40M input, 4M output.

• Sonnet 5, no caching: 40M × $2 + 4M × $10 = $120/month
• Sonnet 5, system prompt cached: 10M uncached × $2 + 30M cached × $0.20 + 4M × $10 = ~$66/month
• Haiku 4.5, no caching: 40M × $1 + 4M × $5 = $60/month (about $33 cached)
• Opus 5, no caching: $300/month — and for a support bot, you won't be able to tell the difference from Sonnet

2. Document extraction: 5,000 invoices or contracts a month, 8,000 tokens in, 500 out, nobody waiting on the result. 40M input, 2.5M output — and "nobody waiting" means Batch.

• Haiku 4.5 standard: $40 + $12.50 = $52.50; on Batch, ~$26
• Sonnet 5 standard: $80 + $25 = $105; on Batch, ~$52.50

This is the workload where model choice is genuinely a cost decision: run a 200-document sample through both, measure the error rate, and let the numbers pick.

3. Content and proposal drafting: 200 long drafts a month, 6,000 tokens in, 2,500 out. 1.2M input, 0.5M output.

• Sonnet 5: $2.40 + $5 = $7.40/month
• Opus 5: $6 + $12.50 = $18.50/month
• Fable 5.1: $12 + $25 = $37/month

At this volume the model is a rounding error against the value of the output. Use the best one. The people agonizing over $11 a month here are the same people paying a writer $2,000 for the drafts.

Anthropic API pricing vs OpenAI API pricing

This page is the Claude side only, on purpose — vendor tables go stale independently, and I'd rather keep one page exactly right than two pages roughly right. The side-by-side, with the OpenAI numbers, the tool-use reliability data from production logs, and the routing pattern most teams end up deploying (Claude for the reasoning hot path, OpenAI for image and voice) is in Claude API vs OpenAI API. The business-level version of the same decision is Anthropic vs OpenAI for business.

Which Claude model should you actually pay for?

The rule I give every client, as of 2026: Haiku for volume, Sonnet as the default, Opus for judgment, Fable when the task is worth $10 in and $50 out. Classification, routing, extraction, tagging, anything that runs ten thousand times — Haiku 4.5. The default for everything customer-facing or quality-sensitive — Sonnet 5, now that $2 / $10 is permanent. Contract analysis, complex multi-step agents, the decisions where a wrong answer costs real money — Opus 5. Fable 5.1 is the top of the range and priced like it; use it where the output is the product and the volume is small. The longer version, by business task, is which Claude model to use for business.

API pricing vs the subscriptions

Two different meters. The API bills per token, as above. The Claude apps — Pro, Max, Team — bill per month with usage limits instead of a meter, and they're the right buy for humans using Claude directly rather than software calling it. Claude's plan pricing covers that side; Claude Code pricing covers the tool that straddles both, since it runs on either API credits or a Max subscription.

The business-owner answer

The Anthropic API is cheap enough now that the cost question is almost never "can we afford it." It's "which model, cached how, batched when" — and that's a design question, not a procurement one. Get it right and a support bot runs for the price of a lunch; get it wrong and you pay Opus prices for Haiku work with no cache in front of it. If you want the workflow-by-workflow model and cost plan written down for your business, that's the AI Readiness Assessment ($2,500 flat, two weeks, credited against a build within 90 days); the self-serve version is the CFSB Playbook ($397); and the "which of these should we even be running through an API" conversation is free on a strategy call.