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GPT 4o Mini vs Gemini 3.5 Flash

At a glance

OpenAI's most advanced small model — fast and affordable.

61128K ctx$0.15/$0.60 per M#69/92

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

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

No shared agent demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper92%
Capability
CapabilityECI60.8
Reasoning & Knowledge
Graduate Science37.7%Factual Recall—
Math
Math Problems52.6%Competition Math6.9%Research Math—
Coding
Real-World Coding—Code Editing3.6%
Agentic
Novel Reasoning—
Reasoning
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter42%
Capability
CapabilityECI42%86.2
Reasoning & Knowledge
Graduate Science146%92.8%Factual Recall68.4%
Math
Math Problems—Competition Math1276%95.6%Research Math39.0%
Coding
Real-World Coding79.3%Code Editing—
Agentic
Novel Reasoning72.1%
Specs
128K
Context
16K
Max output
Jul 2024
Released
1.0M
Context
66K
Max output
May 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input90%$0.15/M tokens
Output93%$0.60/M tokens
Cache read50%$0.07/M tokens
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 GPT 4o MiniGo to model
Chat with Gemini 3.5 FlashGo to model
Frequently Asked Questions: GPT 4o Mini vs Gemini 3.5 Flash▼

Which is better, GPT 4o Mini or Gemini 3.5 Flash?

▼

Based on the Capability Index, Gemini 3.5 Flash scores higher (86.2 vs 60.8). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, GPT 4o Mini or Gemini 3.5 Flash?

▼

GPT 4o Mini has a lower blended cost. GPT 4o Mini: $0.15 input / $0.60 output. Gemini 3.5 Flash: $1.50 input / $9.00 output.

Which has a larger context window, GPT 4o Mini or Gemini 3.5 Flash?

▼

Gemini 3.5 Flash has a larger context window: GPT 4o Mini supports 128K tokens vs Gemini 3.5 Flash at 1M tokens.

Do both GPT 4o Mini and Gemini 3.5 Flash support vision?

▼

Yes, both GPT 4o Mini and Gemini 3.5 Flash support vision/image input.

What are the key differences between GPT 4o Mini and Gemini 3.5 Flash?

▼

Key differences: Gemini 3.5 Flash has a notably higher capability index (25.4 point gap); GPT 4o Mini is significantly cheaper; 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 GPT 4o Mini and Gemini 3.5 Flash for free on idapt.app to see which performs better for your specific needs.

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