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Head-to-head comparison

Gemini 3.8 Flash vs. Grok 4.6

Compare published benchmark results from matching versions and cohorts, API pricing, and technical specifications. Any documented test setup differences remain visible.

shared result series
22
distinct benchmarks
22
latest retrieval
2026-09-02

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Specifications

General specifications

Release date, availability, context window, architecture, and published parameter counts at a glance. Undisclosed details remain marked as unavailable.

Specifications for Gemini 3.8 Flash and Grok 4.6
AttributeGemini 3.8 FlashGrok 4.6
ProviderGooglexAI
ReleasedSep 2, 2026Aug 12, 2026
AvailabilityActiveActive
Model typeProprietaryProprietary
ParametersNot publishedNot published
ArchitectureNot publishedNot published
Context window1,048,576 tokens500,000 tokens
Knowledge cutoffMarch 2026February 1, 2026
Technical sourcesModel, Knowledge cutoffModel

Pricing

API pricing compared

The table compares official standard API rates per 1M tokens, including published cache pricing. Batch, fast, priority, regional surcharges, tool calls, and cloud platform pricing are excluded.

API pricing for Gemini 3.8 Flash and Grok 4.6
Price typeGemini 3.8 FlashGrok 4.6
API input$0.75$2 ≤200K / $4 >200K
API output$3.75$6 ≤200K / $12 >200K
Cache read$0.07$0.5 ≤200K / $1 >200K
Cache write (5 min.)Not listedNot listed
Cache write (1 hr.)Not listedNot listed
Price verified09/02/2026 Source08/16/2026 Source
Gemini 3.8 FlashGrok 4.6
API inputUSD per 1M tokens, base tier
Gemini 3.8 FlashLower price$0.75
Grok 4.6$2
API outputUSD per 1M tokens, base tier
Gemini 3.8 FlashLower price$3.75
Grok 4.6$6
Cache readUSD per 1M tokens, base tier
Gemini 3.8 FlashLower price$0.075
Grok 4.6$0.5

Key to the marks:better valuebetter, but not conclusivetie

Pricing by provider

Direct developer pricing and provider endpoint tariffs routed through OpenRouter are listed separately. Prices are in USD per 1M tokens. Context-dependent direct tiers plus regional, Flex, Priority, and other OpenRouter tariffs remain individually identifiable.

Provider pricing for Gemini 3.8 Flash and Grok 4.6
ModelProviderPurchase route and tariffInput per 1M tokensOutput per 1M tokensSource
Gemini 3.8 FlashGoogleDirect from developerStandard API$0.75$3.75Source09/02/2026
GoogleVia OpenRoutergoogle-vertex/global$0.75$3.75Source09/02/2026
GoogleVia OpenRoutergoogle-vertex/global/flexLowest listed price: $0.375Lowest listed price: $1.875Source09/02/2026
GoogleVia OpenRoutergoogle-vertex/global/priority$1.35$6.75Source09/02/2026
Google AI StudioVia OpenRoutergoogle-ai-studio$0.75$3.75Source09/02/2026
Google AI StudioVia OpenRoutergoogle-ai-studio/flexLowest listed price: $0.375Lowest listed price: $1.875Source09/02/2026
Google AI StudioVia OpenRoutergoogle-ai-studio/priority$1.35$6.75Source09/02/2026
Grok 4.6xAIDirect from developerUp to 200,000 context tokensLowest listed price: $2Lowest listed price: $6Source08/16/2026
xAIDirect from developerAbove 200,000 context tokens$4$12Source08/16/2026
Amazon BedrockVia OpenRouteramazon-bedrock/us-west-2$2.2$6.6Source09/02/2026
xAIVia OpenRouterxaiLowest listed price: $2Lowest listed price: $6Source09/02/2026
xAIVia OpenRouterxai/priority$4$12Source09/02/2026
xAIVia OpenRouterxai/zdrLowest listed price: $2Lowest listed price: $6Source09/02/2026
xAIVia OpenRouterxai/zdr/priority$4$12Source09/02/2026

Performance

Shared benchmarks

Only published results with the same benchmark version, task, metric, and comparison cohort are paired. Different reasoning levels, agents, harnesses, or output limits appear directly in the table.

Capability profile from matched benchmarks

Each axis averages directly matched benchmark families. A value of 100 means the stronger value within this pair, not a universal quality score.

255075100CodingReasoningMathematicsKnowledgeFinanceLegalAgentic tasksProductivity
Gemini 3.8 Flash
Grok 4.6
Coding: 91.4 / 98.9 (4 benchmark families)
Reasoning: 99.7 / 100 (1 benchmark family)
Mathematics: 94.1 / 100 (1 benchmark family)
Knowledge: 100 / 99.1 (1 benchmark family)
Finance: 100 / 92 (4 benchmark families)
Legal: 81.4 / 99.7 (3 benchmark families)
Agentic tasks: 100 / 96.2 (2 benchmark families)
Productivity: 97.7 / 100 (1 benchmark family)

22 matched rows from 22 benchmark families were considered. The radar shows 8 of 11 comparable categories.

Gemini 3.8 FlashGrok 4.6
BioMysteryBenchOverall. Higher is better. No documented setup difference
Gemini 3.8 Flash62.222 %
Grok 4.6Winner72.222 %
Code MigrationOverall. Higher is better. No documented setup difference
Gemini 3.8 Flash36.546 %
Grok 4.6Winner44.572 %
EMBOverall. Higher is better. No documented setup difference
Gemini 3.8 FlashWinner72.196 %
Grok 4.662.727 %
Finance Agent (v2)Overall. Higher is better. No documented setup difference
Gemini 3.8 FlashWinner61.435 %
Grok 4.653.682 %
GPQA DiamondOverall. Higher is better. No documented setup difference
Gemini 3.8 Flash94.444 %
Grok 4.6Winner94.697 %
Harvey's Legal Agent BenchmarkOverall · Task fully resolved. Higher is better. No documented setup difference
Gemini 3.8 Flash10 %
Grok 4.6Winner15.833 %
Legal Research BenchOverall · All-pass. Higher is better. No documented setup difference
Gemini 3.8 Flash38.942 %
Grok 4.6Winner48.077 %
LegalBenchOverall. Higher is better. No documented setup difference
Gemini 3.8 FlashWinner86.993 %
Grok 4.686.307 %
LiveCodeBench v6Overall. Higher is better. No documented setup difference
Gemini 3.8 FlashWinner89.484 %
Grok 4.688.224 %
MedCodeOverall. Higher is better. No documented setup difference
Gemini 3.8 FlashWinner48.135 %
Grok 4.644.712 %
MedScribeOverall. Higher is better. No documented setup difference
Gemini 3.8 Flash84.496 %
Grok 4.6Winner86.534 %
MMLU-ProOverall. Higher is better. No documented setup difference
Gemini 3.8 FlashWinner90.221 %
Grok 4.689.4 %

Key to the marks:better valuebetter, but not conclusivetie

Benchmark scores for Gemini 3.8 Flash and Grok 4.6
Benchmark and taskGemini 3.8 FlashGrok 4.6Source
BioMysteryBenchOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is betterSettings: Harness: Terminus 2
62.222 %
Winner72.222 %
Vals AI
Source details
Data as of: 09/02/2026
Code MigrationOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
36.546 %
Winner44.572 %
Vals AI
Source details
Data as of: 09/01/2026
EMBOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner72.196 %
62.727 %
Vals AI
Source details
Data as of: 09/01/2026
Finance Agent (v2)Overall
Test details
No documented difference in the test setupVersion: 2Metric: accuracyScoring: Higher is better
Winner61.435 %
53.682 %
Vals AI
Source details
Data as of: 09/01/2026
GPQA DiamondOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
94.444 %
Winner94.697 %
Vals AI
Source details
Data as of: 09/01/2026
Harvey's Legal Agent BenchmarkOverall · Task fully resolved
Test details
No documented difference in the test setupVersion: 1Metric: task resolution rateScoring: Higher is better
10 %
Winner15.833 %
Vals AI
Source details
Data as of: 09/01/2026
Legal Research BenchOverall · All-pass
Test details
No documented difference in the test setupVersion: 1Metric: all-pass rateScoring: Higher is better
38.942 %
Winner48.077 %
Vals AI
Source details
Data as of: 09/01/2026
LegalBenchOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner86.993 %
86.307 %
Vals AI
Source details
Data as of: 09/01/2026
LiveCodeBench v6Overall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner89.484 %
88.224 %
Vals AI
Source details
Data as of: 09/01/2026
MedCodeOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner48.135 %
44.712 %
Vals AI
Source details
Data as of: 09/01/2026
MedScribeOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
84.496 %
Winner86.534 %
Vals AI
Source details
Data as of: 09/01/2026
MMLU-ProOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner90.221 %
89.4 %
Vals AI
Source details
Data as of: 09/01/2026
MortgageTaxOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner65.342 %
64.189 %
Vals AI
Source details
Data as of: 09/01/2026
ProofBenchOverall
Test details
No documented difference in the test setupVersion: 1.1Metric: accuracyScoring: Higher is better
48 %
Winner51 %
Vals AI
Source details
Data as of: 09/01/2026
Public Benefits Bench v1.1Overall
Test details
No documented difference in the test setupVersion: 1.1Metric: accuracyScoring: Higher is better
65.291 %
Winner66.847 %
Vals AI
Source details
Data as of: 09/01/2026
SAGEOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner35.064 %
28.9 %
Vals AI
Source details
Data as of: 09/01/2026
SkillsBenchOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is betterSettings: Harness: OpenHands
Winner57.985 %
55.766 %
Vals AI
Source details
Data as of: 09/01/2026
SWE-bench VerifiedOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
80 %
Winner95.6 %
Vals AI
Source details
Data as of: 09/01/2026
TaxEval v2Overall
Test details
No documented difference in the test setupVersion: 2Metric: accuracyScoring: Higher is better
Winner74.448 %
71.096 %
Vals AI
Source details
Data as of: 09/01/2026
Terminal-Bench 2.1Overall
Test details
No documented difference in the test setupVersion: 2.1Metric: accuracyScoring: Higher is better
Winner81.273 %
78.277 %
Vals AI
Source details
Data as of: 09/01/2026
Vals IndexOverall
Test details
No documented difference in the test setupVersion: 2Metric: weighted index scoreScoring: Higher is better
Winner62.252 %
59.167 %
Vals AI
Source details
Data as of: 09/01/2026
Vibe Code Bench v1.1Overall
Test details
No documented difference in the test setupVersion: 1.1Metric: accuracyScoring: Higher is betterSettings: Harness: OpenHands
Winner78.651 %
76.239 %
Vals AI
Source details
Data as of: 09/01/2026

Key to the marks:better valuebetter, but not conclusivetie

How to read this comparison

Winning one benchmark is not an overall verdict

Your workload, budget, and required context length matter most. A coding benchmark says little about visual understanding or agent performance.

The standard price table uses direct developer rates. The provider comparison labels OpenRouter endpoints, regions, and special tariffs separately.

Every result links to its measurement source and retrieval date. Labels distinguish vendor reports, official benchmark leaderboards, and independent evaluations. Disputed or archived results are excluded.

More matchups

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View the complete LLM comparison