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GPT 5.3 vs Gemini 3.5 Flash

At a glance

Refined for natural conversations — smoother, more useful, and more directly helpful.

128K ctx$1.75/$14.00 per M

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

861.0M ctx$1.50/$9.00 per M#11/92
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
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Capability
Capability—
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—Research Math—
Coding
Real-World Coding—
Agentic
Novel Reasoning—
Reasoning
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper30%
Capability
CapabilityECI86.2
Reasoning & Knowledge
Graduate Science92.8%Factual Recall68.4%
Math
Competition Math95.6%Research Math39.0%
Coding
Real-World Coding79.3%
Agentic
Novel Reasoning72.1%
Specs
128K
Context
16K
Max output
Mar 2026
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$1.75/M tokens
Output$14.00/M tokens
Cache read$0.17/M tokens
Web search29%$0.01/search
Live pricing, shown before you run
Input14%$1.50/M tokens
Output36%$9.00/M tokens
Reasoning$9.00/M tokens
Cache read14%$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 5.3Go to model
Chat with Gemini 3.5 FlashGo to model
Frequently Asked Questions: GPT 5.3 vs Gemini 3.5 Flash▼

Which is better, GPT 5.3 or Gemini 3.5 Flash?

▼

Both GPT 5.3 and Gemini 3.5 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 5.3 or Gemini 3.5 Flash?

▼

Gemini 3.5 Flash has a lower blended cost. GPT 5.3: $1.75 input / $14.00 output. Gemini 3.5 Flash: $1.50 input / $9.00 output.

Which has a larger context window, GPT 5.3 or Gemini 3.5 Flash?

▼

Gemini 3.5 Flash has a larger context window: GPT 5.3 supports 128K tokens vs Gemini 3.5 Flash at 1M tokens.

Do both GPT 5.3 and Gemini 3.5 Flash support vision?

▼

Yes, both GPT 5.3 and Gemini 3.5 Flash support vision/image input.

What are the key differences between GPT 5.3 and Gemini 3.5 Flash?

▼

Key differences: 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 5.3 and Gemini 3.5 Flash for free on idapt.app to see which performs better for your specific needs.

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