UCP PlaygroundGemini 3.8 Flash/Models/Gemini 3.8 Flash
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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 Tokens94,836Avg Duration72.4sTurns to Checkout4
CheckoutCartSearchTurnsTokens6.753.310010091
Shopping Score52/100
Fair

Scores computed from real agent sessions against live UCP-enabled stores. Not estimated — every data point is from an actual tool call, checkout attempt, and store response.

Shopping Score Breakdown

Checkout Rate40%6.7%
Cart Rate20%53.3%
Search Rate10%100%
Turn Efficiency15%100%
Token Efficiency15%91%

Top Stores

StoreCheckout %Cart %
presscoffee.com0%50%
ascentprotein.com0%100%
••••••••••••••••0%50%
••••••••••••••••0%33.3%
••••••••••••••••0%0%

Known Issues

Metrics Pendinglow

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

Token Usage

Avg per Session94,836
Fleet Average74,927
vs Fleet+27%
Median (p50)62,494
p90273,740
Prompt / Completion split
Prompt 91,765 (97%) Completion 3,071 (3%)
Daily Average Tokens (last 30 days)
Distribution range
Min5,996p2526,976p5062,494p7569,638p90273,740Max397,995

Test Gemini 3.8 Flash on Your Store

Run a live agent session to see how Gemini 3.8 Flash handles your store's checkout flow end-to-end.

Run Agent Session

Compare With Other Models

MetaMetaLlama 3.3 70B39.3%GoogleGoogleGemini 3.5 Flash38.1%AnthropicAnthropicClaude Sonnet 4.634.7%xAIxAIGrok 4.326.3%GoogleGoogleGemini 2.5 Flash23.3%AnthropicAnthropicClaude Opus 4.822.3%AlibabaAlibabaQwen 3.8 Flash22.2%DeepSeekDeepSeekDeepSeek V3.220.7%GoogleGoogleGemini 2.5 Pro19.8%GoogleGoogleGemini 3.1 Pro19.6%OpenAIOpenAIGPT-4o15%DeepSeekDeepSeekDeepSeek V4.1 Flash14.3%xAIxAIGrok 3 Mini (Reasoning)11.1%OpenAIOpenAIGPT-5.510.2%OpenAIOpenAIo4-mini (Reasoning)9.1%AnthropicAnthropicClaude Opus 59%xAIxAIGrok 4.58.1%AnthropicAnthropicClaude Sonnet 57.7%DeepSeekDeepSeekDeepSeek V4 Pro7.7%DeepSeekDeepSeekDeepSeek V4 Flash7.5%GoogleGoogleGemini 3.8 Flash6.7%DeepSeekDeepSeekDeepSeek R1 (Reasoning)3.6%Moonshot AIMoonshot AIKimi K33.1%AlibabaAlibabaQwen 3.7 Max2.6%MetaMetaLlama 4 Maverick2.3%GoogleGoogleGemini 3.6 Flash1.1%GoogleGoogleGemini 3.7 Flash0%OpenAIOpenAIGPT-6 Luna0%MetaMetaMuse Spark 1.30%AlibabaAlibabaQwQ 32B (Reasoning)0%
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