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o1 vs Gemini 3.5 Flash

At a glance

OpenAI's original frontier reasoning model with deep thinking.

75200K ctx$15.00/$60.00 per M#42/92

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
Reasoning
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Capability
CapabilityECI75.2
Reasoning & Knowledge
Graduate Science76.8%Factual Recall—
Math
Math Problems94.7%Competition Math73.3%Research Math9.3%
Coding
Real-World Coding—Code Editing61.7%
Agentic
Novel Reasoning—Task Horizon39min
Reasoning
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter15%Cheaper87%
Capability
CapabilityECI15%86.2
Reasoning & Knowledge
Graduate Science21%92.8%Factual Recall68.4%
Math
Math Problems—Competition Math30%95.6%Research Math319%39.0%
Coding
Real-World Coding79.3%Code Editing—
Agentic
Novel Reasoning72.1%Task Horizon—
Specs
200K
Context
100K
Max output
Dec 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$15.00/M tokens
Output$60.00/M tokens
Cache read$7.50/M tokens
Web search29%$0.01/search
Live pricing, shown before you run
Input90%$1.50/M tokens
Output85%$9.00/M tokens
Reasoning$9.00/M tokens
Cache read98%$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 o1Go to model
Chat with Gemini 3.5 FlashGo to model
Frequently Asked Questions: o1 vs Gemini 3.5 Flash▼

Which is better, o1 or Gemini 3.5 Flash?

▼

Based on the Capability Index, Gemini 3.5 Flash scores higher (86.2 vs 75.2). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, o1 or Gemini 3.5 Flash?

▼

Gemini 3.5 Flash has a lower blended cost. o1: $15.00 input / $60.00 output. Gemini 3.5 Flash: $1.50 input / $9.00 output.

Which has a larger context window, o1 or Gemini 3.5 Flash?

▼

Gemini 3.5 Flash has a larger context window: o1 supports 200K tokens vs Gemini 3.5 Flash at 1M tokens.

Do both o1 and Gemini 3.5 Flash support vision?

▼

Yes, both o1 and Gemini 3.5 Flash support vision/image input.

What are the key differences between o1 and Gemini 3.5 Flash?

▼

Key differences: Gemini 3.5 Flash has a notably higher capability index (11.0 point gap); Gemini 3.5 Flash is significantly cheaper. 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 o1 and Gemini 3.5 Flash for free on idapt.app to see which performs better for your specific needs.

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