Mercury 2 vs Mercury 3

API pricing, benchmark indices and specs — updated 20 October 2026.

inception · A · API-only

Input / 1M

$0.25

Output / 1M

$0.75

AA index

10.8

proprietary · 128K context

inception · B · API-only

Input / 1M

$0.10

Output / 1M

$0.35

AA index

—

proprietary · 1M context

Specification comparison

Differences are highlighted; identical values are muted.

Specification	Mercury 2	Mercury 3
Deployment	API-only (closed weights)	API-only (closed weights)
Parameters	n/a — API-only	n/a — API-only
Architecture	n/a — API-only	n/a — API-only
Context length	128,000	1,000,000
Licence	Proprietary	Proprietary
Commercial use	Per API terms	Per API terms
Languages	n/a — API-only	n/a — API-only
Downloads 30d	n/a — API-only	n/a — API-only
Downloads all time	n/a — API-only	n/a — API-only
Quantizations on the Hub	n/a — API-only	n/a — API-only
Gated	n/a — API-only	n/a — API-only
First seen on the Hub	n/a — API-only	n/a — API-only
API input price / 1M tokens	$0.25	$0.10
API output price / 1M tokens	$0.75	$0.35
Est. cost per 1M input + 1M output tokens	$1.00	$0.45
Cached input / 1M tokens	$0.025	$0.01
AA Intelligence Index	10.8	—
AA Coding Index	31.1	—
AA Agentic Index	1.6	—
Max output tokens	50,000	131,072
API providers	1	1
Tool calling	Yes	Yes
Reasoning mode	Yes	Yes

Estimated cost of 1M input + 1M output tokens via OpenRouter

Mercury 2 $1.00

Mercury 3 $0.45

Mercury 3 is 2.2× cheaper at list price.