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Grok 4 Fast vs Gemini 3.5 Flash

At a glance

Fast version of Grok 4 with SOTA cost-efficiency and 2M-token context.

772M ctx#36/92

Google's high-speed thinking model for agentic workflows, chat, and coding.

861.0M ctx$1.50/$9.00 per M#11/92
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch ECI·Epoch AI· as of 2026-07-10
Capability
CapabilityECI77.0
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—Research Math—
Coding
Real-World Coding—
Agentic
Novel Reasoning5.3%
Reasoning
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter12%
Capability
CapabilityECI12%86.2
Reasoning & Knowledge
Graduate Science92.8%Factual Recall68.4%
Math
Competition Math95.6%Research Math39.0%
Coding
Real-World Coding79.3%
Agentic
Novel Reasoning1265%72.1%
Specs
2M
Context
33K
Max output
—
Released
1.0M
Context
66K
Max output
May 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Pricing not available
Live pricing, shown before you run
Input$1.50/M tokens
Output$9.00/M tokens
Reasoning$9.00/M tokens
Cache read$0.15/M tokens
Cache write$0.08/M tokens
Image input$1.50/M tokens
Audio input$3.00/M tokens
Web search$0.01/search
Chat with Grok 4 FastGo to model
Chat with Gemini 3.5 FlashGo to model
Frequently Asked Questions: Grok 4 Fast vs Gemini 3.5 Flash▼

Which is better, Grok 4 Fast or Gemini 3.5 Flash?

▼

Based on the Capability Index, Gemini 3.5 Flash scores higher (86.2 vs 77.0). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which has a larger context window, Grok 4 Fast or Gemini 3.5 Flash?

▼

Grok 4 Fast has a larger context window: Grok 4 Fast supports 2M tokens vs Gemini 3.5 Flash at 1M tokens.

Do both Grok 4 Fast and Gemini 3.5 Flash support vision?

▼

Yes, both Grok 4 Fast and Gemini 3.5 Flash support vision/image input.

What are the key differences between Grok 4 Fast and Gemini 3.5 Flash?

▼

Key differences: Gemini 3.5 Flash has a notably higher capability index (9.2 point gap); only Gemini 3.5 Flash offers extended reasoning mode. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Grok 4 Fast and Gemini 3.5 Flash for free on idapt.app to see which performs better for your specific needs.

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