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o3 vs Gemini 3.5 Flash

At a glance

OpenAI's most powerful reasoning model — top across math, coding, and science.

79200K ctx$2.00/$8.00 per M#27/92

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
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Capability
CapabilityECI79.2
Reasoning & Knowledge
Graduate Science81.8%Expert-Level20.3%Factual Recall53.0%
Math
Math Problems97.8%Competition Math83.9%Research Math18.7%
Coding
Real-World Coding62.3%Code Editing81.3%
Agentic
Novel Reasoning6.5%Task Horizon1.5h
Reasoning
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter9%Cheaper4%
Capability
CapabilityECI9%86.2
Reasoning & Knowledge
Graduate Science13%92.8%Expert-Level—Factual Recall29%68.4%
Math
Math Problems—Competition Math14%95.6%Research Math109%39.0%
Coding
Real-World Coding27%79.3%Code Editing—
Agentic
Novel Reasoning1004%72.1%Task Horizon—
Specs
200K
Context
100K
Max output
Apr 2025
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$2.00/M tokens
Output11%$8.00/M tokens
Cache read$0.50/M tokens
Web search29%$0.01/search
Live pricing, shown before you run
Input25%$1.50/M tokens
Output$9.00/M tokens
Reasoning$9.00/M tokens
Cache read70%$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 o3Go to model
Chat with Gemini 3.5 FlashGo to model
Frequently Asked Questions: o3 vs Gemini 3.5 Flash▼

Which is better, o3 or Gemini 3.5 Flash?

▼

Based on the Capability Index, Gemini 3.5 Flash scores higher (86.2 vs 79.2). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, o3 or Gemini 3.5 Flash?

▼

Gemini 3.5 Flash has a lower blended cost. o3: $2.00 input / $8.00 output. Gemini 3.5 Flash: $1.50 input / $9.00 output.

Which has a larger context window, o3 or Gemini 3.5 Flash?

▼

Gemini 3.5 Flash has a larger context window: o3 supports 200K tokens vs Gemini 3.5 Flash at 1M tokens.

Do both o3 and Gemini 3.5 Flash support vision?

▼

Yes, both o3 and Gemini 3.5 Flash support vision/image input.

Which has better coding performance, o3 or Gemini 3.5 Flash?

▼

Gemini 3.5 Flash scores higher on SWE-bench Verified: o3 resolves 62% vs Gemini 3.5 Flash at 79%.

What are the key differences between o3 and Gemini 3.5 Flash?

▼

Key differences: Gemini 3.5 Flash has a notably higher capability index (7.0 point gap). 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 o3 and Gemini 3.5 Flash for free on idapt.app to see which performs better for your specific needs.

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