Home / Anthropic / Claude Sonnet 4.5 (latest)

Claude Sonnet 4.5 (latest)

Claude Sonnet 4.5 (latest) is developed by Anthropic, released 2025-09-29.

Model ID: claude-sonnet-4-5

Input price
$3.00 / 1M tok
Output price
$15.00 / 1M tok
Blended price
$6.00 / 1M tok
Epoch Capabilities Index (ECI)
147.6
40th percentile of 107 models with an Epoch Capabilities Index (ECI) score
Epoch AI · as of 2025-09-29
Epoch Mock AIME accuracy
No public data yet
Epoch FrontierMath (T1–3) accuracy
No public data yet
Arena text rating
No public data yet
Arena coding rating (human preference votes, not task accuracy)
No public data yet
Arena math rating
No public data yet
Arena WebDev rating
No public data yet

Third-party resale listings

Captured 2026-11-06 from the reseller marketplace subrouter.ai's public pricing list. These are third-party resale prices, not Anthropic's official price. Many resellers use shared/subscription access or reverse-engineered integrations — availability and quality are not verified by this site. Prices are USD per 1M tokens. Reseller names are the marketplace's own listing IDs, not company names — none of them is Anthropic or any other model developer.

1 reseller passed our sanity checks against Anthropic's official price.

Reseller (marketplace ID)Input $/1MOutput $/1MBlended $/1Mvs. official
sh00t.host 0.03 0.15 0.06 1% Likely subscription-resale / reverse-engineered

Resale listings: subrouter.ai public marketplace snapshot 2026-11-06.

Official list price from Anthropic, as recorded by models.dev. See the third-party resale listings above for reseller prices — those are not official and not verified by this site.

See all of Anthropic's models on its provider page, or browse the full model directory. Full source licenses and sync dates: /data-sources/.