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Claude Sonnet 4 vs Gemini 3.5 Flash

At a glance

Significantly enhanced over Sonnet 3.7 in coding and reasoning tasks.

75200K ctx$3.00/$15.00 per M#43/92

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
CapabilityECI74.7
Reasoning & Knowledge
Graduate Science66.7%Factual Recall—
Math
Math Problems84.4%Competition Math28.9%Research Math4.1%
Coding
Real-World Coding—Code Editing56.4%
Agentic
Novel Reasoning1.3%
Reasoning
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter15%Cheaper44%
Capability
CapabilityECI15%86.2
Reasoning & Knowledge
Graduate Science39%92.8%Factual Recall68.4%
Math
Math Problems—Competition Math231%95.6%Research Math842%39.0%
Coding
Real-World Coding79.3%Code Editing—
Agentic
Novel Reasoning5576%72.1%
Specs
200K
Context
64K
Max output
May 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$3.00/M tokens
Output$15.00/M tokens
Cache read$0.30/M tokens
Cache write$3.75/M tokens
Web search29%$0.01/search
Live pricing, shown before you run
Input50%$1.50/M tokens
Output40%$9.00/M tokens
Reasoning$9.00/M tokens
Cache read50%$0.15/M tokens
Cache write98%$0.08/M tokens
Image input$1.50/M tokens
Audio input$3.00/M tokens
Web search$0.01/search
Chat with Claude Sonnet 4Go to model
Chat with Gemini 3.5 FlashGo to model
Frequently Asked Questions: Claude Sonnet 4 vs Gemini 3.5 Flash▼

Which is better, Claude Sonnet 4 or Gemini 3.5 Flash?

▼

Based on the Capability Index, Gemini 3.5 Flash scores higher (86.2 vs 74.7). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, Claude Sonnet 4 or Gemini 3.5 Flash?

▼

Gemini 3.5 Flash has a lower blended cost. Claude Sonnet 4: $3.00 input / $15.00 output. Gemini 3.5 Flash: $1.50 input / $9.00 output.

Which has a larger context window, Claude Sonnet 4 or Gemini 3.5 Flash?

▼

Gemini 3.5 Flash has a larger context window: Claude Sonnet 4 supports 200K tokens vs Gemini 3.5 Flash at 1M tokens.

Do both Claude Sonnet 4 and Gemini 3.5 Flash support vision?

▼

Yes, both Claude Sonnet 4 and Gemini 3.5 Flash support vision/image input.

What are the key differences between Claude Sonnet 4 and Gemini 3.5 Flash?

▼

Key differences: Gemini 3.5 Flash has a notably higher capability index (11.5 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 Claude Sonnet 4 and Gemini 3.5 Flash for free on idapt.app to see which performs better for your specific needs.

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