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GPT 4o vs Gemini 3.5 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 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
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Capability
CapabilityECI63.0
Reasoning & Knowledge
Graduate Science49.2%Expert-Level2.7%Factual Recall—
Math
Math Problems53.3%Competition Math6.4%Research Math0.3%
Coding
Real-World Coding31.0%Code Editing23.1%
Agentic
Novel Reasoning—Task Horizon9min
Reasoning
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter37%Cheaper23%
Capability
CapabilityECI37%86.2
Reasoning & Knowledge
Graduate Science89%92.8%Expert-Level—Factual Recall68.4%
Math
Math Problems—Competition Math1396%95.6%Research Math11200%39.0%
Coding
Real-World Coding156%79.3%Code Editing—
Agentic
Novel Reasoning72.1%Task Horizon—
Specs
128K
Context
16K
Max output
May 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
Input$2.50/M tokens
Output$10.00/M tokens
Cache read$1.25/M tokens
Live pricing, shown before you run
Input40%$1.50/M tokens
Output10%$9.00/M tokens
Reasoning$9.00/M tokens
Cache read88%$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 4oGo to model
Chat with Gemini 3.5 FlashGo to model
Frequently Asked Questions: GPT 4o vs Gemini 3.5 Flash▼

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

▼

Based on the Capability Index, Gemini 3.5 Flash scores higher (86.2 vs 63.0). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

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

▼

Gemini 3.5 Flash has a lower blended cost. GPT 4o: $2.50 input / $10.00 output. Gemini 3.5 Flash: $1.50 input / $9.00 output.

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

▼

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

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

▼

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

Which has better coding performance, GPT 4o or Gemini 3.5 Flash?

▼

Gemini 3.5 Flash scores higher on SWE-bench Verified: GPT 4o resolves 31% vs Gemini 3.5 Flash at 79%.

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

▼

Key differences: Gemini 3.5 Flash has a notably higher capability index (23.2 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 GPT 4o and Gemini 3.5 Flash for free on idapt.app to see which performs better for your specific needs.

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