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GPT 4o vs Gemini 3.8 Flash

At a glance

OpenAI's original omni model supporting text and image inputs.

63128K ctx$2.50/$10.00 per M#64/92

Google's most intelligent Flash model, with significant gains over 3.7 Flash across software engineering, agentic tasks, and multi-step reasoning.

1.0M ctx$0.83/$4.13 per M
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
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-10-02
Capability
CapabilityECI63.0
Reasoning & Knowledge
Graduate Science49.2%Expert-Level2.7%Factual Recall26.0%
Math
Math Problems53.3%Competition Math6.4%Research Math0.3%
Coding
Real-World Coding31.0%Code Editing23.1%
Agentic
Task Horizon9min
Reasoning
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Cheaper62%
Capability
Capability—
Reasoning & Knowledge
Graduate Science94%95.4%Expert-Level—Factual Recall168%69.7%
Math
Math Problems—Competition Math1448%98.9%Research Math—
Coding
Real-World Coding—Code Editing—
Agentic
Task Horizon—
Specs
128K
Context
16K
Max output
May 2024
Released
1.0M
Context
66K
Max output
Sep 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$2.50/M tokens
Output$10.00/M tokens
Cache read$1.25/M tokens
Live pricing, shown before you run
Input67%$0.83/M tokens
Output59%$4.13/M tokens
Reasoning$4.13/M tokens
Cache read93%$0.08/M tokens
Cache write$0.04/M tokens
Image input$0.83/M tokens
Audio input$0.83/M tokens
Web search$0.01/search
Chat with GPT 4oGo to model
Chat with Gemini 3.8 FlashGo to model
Frequently Asked Questions: GPT 4o vs Gemini 3.8 Flash▼

Which is better, GPT 4o or Gemini 3.8 Flash?

▼

Both GPT 4o and Gemini 3.8 Flash are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, GPT 4o or Gemini 3.8 Flash?

▼

Gemini 3.8 Flash has a lower blended cost. GPT 4o: $2.50 input / $10.00 output. Gemini 3.8 Flash: $0.83 input / $4.13 output.

Which has a larger context window, GPT 4o or Gemini 3.8 Flash?

▼

Gemini 3.8 Flash has a larger context window: GPT 4o supports 128K tokens vs Gemini 3.8 Flash at 1M tokens.

Do both GPT 4o and Gemini 3.8 Flash support vision?

▼

Yes, both GPT 4o and Gemini 3.8 Flash support vision/image input.

What are the key differences between GPT 4o and Gemini 3.8 Flash?

▼

Key differences: Gemini 3.8 Flash is significantly cheaper; only Gemini 3.8 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 and Gemini 3.8 Flash for free on idapt.app to see which performs better for your specific needs.

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