Commercial software intelligenceEvidence checked · 29 September 2026
SkuTrace

Commercial product change, preserved as evidence.

SK-2026-216 · Pricing, billing & commercial terms

Anthropic sets Claude Sonnet 5.5 API pricing at $2 input and $10 output per million tokens

Anthropic lists Claude Sonnet 5.5 at $2 per million input tokens, $10 per million output tokens, $0.20 per million cache-read tokens and $2.50 per million cache-write tokens.

Direct API list pricing published

Commercial transition

Previous stateThe direct Anthropic API catalogue did not contain the Claude Sonnet 5.5 unit-price schedule.
→
New stateClaude Sonnet 5.5 direct API list pricing is $2/M input, $10/M output, $0.20/M cache reads and $2.50/M cache writes.

Who is affected

Developers and organisations purchasing Claude Sonnet 5.5 usage directly from Anthropic.

Action required

Update direct-provider cost models using the published unit schedule while preserving workload-specific token and cache behavior.

Evidence boundary

The unit prices match Sonnet 5. Anthropic's up-to-30%-lower per-task claim is an efficiency claim, not a unit-price reduction. Marketplace, tax, local-currency and negotiated-enterprise terms are not inferred.

Timeline

  1. API list pricing published

    Anthropic published the direct unit-price schedule.

Official sources

  • Claude Sonnet 5.5Anthropic · 2026-09-28 · Official Anthropic direct API pricing authority