AI cost · Anthropic
Anthropic API cost: what you actually pay
Usage-based tokens by model. Watch the Opus premium — and that Opus 4.7’s tokenizer emits ~35% more tokens for the same text, quietly inflating bills at an unchanged per-token rate.
Public pricing
Token rates (USD per 1M tokens)
| Model | Input | Output | Cache read |
|---|---|---|---|
| Claude Opus 4.7New tokenizer emits ~35% more tokens for the same text. | $5 | $25 | $0.5 |
| Claude Sonnet 4.6 | $3 | $15 | $0.3 |
| Claude Haiku 4.5 | $1 | $5 | $0.1 |
Prompt caching cuts repeated-context reads to roughly a tenth of input price (see cache-read rates). Model choice dominates cost.
Last updated: 2026-07-22. Sourced from Anthropic pricing (official) ↗, Claude API rates (2026) ↗.
Where the real Anthropic API cost hides
The sticker is the smallest part of the story. For Anthropic API, these are the line items that quietly inflate the bill:
- Opus tokenizer inflation raising real cost at a flat per-token rate
- Prompt caching left off (cache reads are ~10× cheaper than fresh input)
- Opus used on tasks Sonnet or Haiku would handle
What an audit finds on Anthropic API
Opus on workloads Sonnet handles, caching disabled, and silent token growth from the new tokenizer inflating month-over-month spend.
Worked example: Anthropic API at production volume
Take 50M input and 10M output tokens a month — a modest production workload, and a round number we picked — on Claude Opus 4.7 at the published rates above.
- Monthly
- $500
- Annual
- $6,000
- On Claude Haiku 4.5
- $100
Same volume, $4,800 a year apart. Most workloads are a mix — some of it genuinely needs the frontier model and some of it does not — so the real question is what share of your calls is the routine kind, and that is a measurement, not a guess.
Arithmetic on the published prices above. Your mix will differ — run your own numbers.
Anthropic API pricing FAQ
How much does the Claude API cost?
Per million tokens: Opus 4.7 $5 in / $25 out, Sonnet 4.6 $3 / $15, Haiku 4.5 $1 / $5, with cache reads at roughly a tenth of input.
How do I cut Claude API cost?
Turn on prompt caching, drop from Opus to Sonnet/Haiku where quality allows, and watch tokenizer-driven token growth on Opus 4.7.
How much can routing cut a Anthropic API bill?
On 50M input and 10M output tokens a month, Claude Opus 4.7 costs $500 at published rates and Claude Haiku 4.5 costs $100 — $4,800 a year apart for the same volume. What you can actually move depends on how much of your traffic is routine, which is a measurement rather than a guess.
Are these Anthropic API prices current?
They were last checked against Anthropic pricing (official) and Claude API rates (2026) on 2026-07-22. Every price on this page carries that date and a link to its source, and a scheduled check fails our build when any figure goes more than 30 days unverified. Vendors do change pricing between checks — the source link is there so you can confirm before you sign.
What is Anthropic API really costing you?
Spendassay connects your Anthropic API spend to actual usage and engineering output — a proof-level AI cost report with the wasted dollars named. Neutral across every AI vendor.
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