Mercury 2.5
Mercury 2.5 is an API-only (closed weights) language model from Inception, released September 8, 2026. The context window is 254K tokens. API price: $0.2 input / $0.75 output per million tokens.
Today, we’re releasing Mercury 2.5, our most capable production model yet. It is a significant step up in quality over Mercury 2, with the same low-latency, low-cost serving profile.
Check it against your own PC →
Lab
Inception
Released
September 8, 2026
Weights
API-only (closed weights)
Parameters
–
Context
254K
Price / M tokens
$0.2 / $0.75 in / out
Epoch ECI
not yet rated
Benchmark results
Epoch AI has not published results for Mercury 2.5 yet. New models are usually evaluated within days to weeks.
Links
More from Inception
Mercury 3 · Mercury Edit 2 · Mercury 2 · Mercury Coder Mini · Mercury Coder Small