Google

Gemini 3.8 Flash

Google's newest fast tier (Gemini 3.8 Flash, 2 Sep 2026; OpenRouter lists it as its most capable Flash for agentic, multi-step work). Same price as 3.6 Flash. Newly added: Playground benchmark metrics are still being gathered.

Avg tokens per run: 122,094
Avg duration: 75.6s
Turns to checkout: 14

Start a run with Gemini 3.8 Flash Compare

Shopping score

22/100Weak

Scores come from runs on UCP stores, not estimates: every figure is a tool call, a checkout attempt or a store’s answer.

Shopping score breakdown

Checkout rate40%5.6%
Cart rate20%50%
Search rate10%100%
Turn efficiency15%0%
Token efficiency15%0%

Top stores

Development stores are hidden.

Store	Checkout	Cart
presscoffee.com	0%	50%
ascentprotein.com	0%	100%
store hidden	0%	50%
store hidden	0%	33.3%
store hidden	0%	0%
store hidden	0%	0%

Known issues

LowMetrics Pending
Gemini 3.8 Flash was recently added; its Playground benchmark metrics are still being gathered.

Token usage

Avg per run: 122,094
Average of all models: 78,415
Against the average: +56%
Median (p50): 63,201
p90: 357,416

Prompt and completion

Prompt 118,834 (97%)Completion 3,259 (3%)

Daily average tokens per run, last 30 days

Oct 29Total 37,843Prompt 36,726Completion 1,117

Range

Min: 5,996
p25: 28,009
p50: 63,201
p75: 131,871
p90: 357,416
Max: 574,646

Test Gemini 3.8 Flash on your store

Start a run to see how Gemini 3.8 Flash handles your store’s checkout, call by call.

Start a run