Home / Anthropic / Claude Sonnet 4.5

Claude Sonnet 4.5

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

Model ID: claude-sonnet-4-5-20250929

Input price
$3.00 / 1M tok
Output price
$15.00 / 1M tok
Blended price
$6.00 / 1M tok
Epoch Capabilities Index (ECI)
No public data yet
Epoch Mock AIME accuracy
35.6%
Epoch AI · as of 2025-09-29
Epoch FrontierMath (T1–3) accuracy
No public data yet
Arena text rating
1455.1
73rd percentile of 164 models with an Arena text rating score
LMArena · as of 2026-11-06
Arena coding rating (human preference votes, not task accuracy)
1512.0
LMArena · as of 2026-11-06
Arena math rating
1427.2
LMArena · as of 2026-11-06
Arena WebDev rating
1384.8
LMArena · as of 2026-11-06

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.

2 resellers passed our sanity checks against Anthropic's official price.

Reseller (marketplace ID)Input $/1MOutput $/1MBlended $/1Mvs. official
H2 0.125 0.5882 0.2408 4% Likely subscription-resale / reverse-engineered
xcgx 0.1235 0.6176 0.2471 4% 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/.