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Claude Sonnet 4 vs Claude 3.5 Sonnet

At a glance

Significantly enhanced over Sonnet 3.7 in coding and reasoning tasks.

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

Claude 3.5 Sonnet — better-than-Opus capabilities at Sonnet speeds.

68200K ctx#59/92
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
Reasoning
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter11%
Capability
CapabilityECI11%74.7
Reasoning & Knowledge
Graduate Science21%66.7%Expert-Level—
Math
Math Problems48%84.4%Competition Math241%28.9%Research Math100%4.1%
Coding
Code Editing9%56.4%
Agentic
Novel Reasoning1.3%Task Horizon—
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI· as of 2026-07-10
Capability
CapabilityECI67.5
Reasoning & Knowledge
Graduate Science55.3%Expert-Level4.1%
Math
Math Problems56.9%Competition Math8.5%Research Math2.1%
Coding
Code Editing51.6%
Agentic
Novel Reasoning—Task Horizon30min
Specs
200K
Context
64K
Max output
May 2025
Released
200K
Context
8K
Max output
—
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 search$0.01/search
Pricing not available
Chat with Claude Sonnet 4Go to model
Chat with Claude 3.5 SonnetGo to model
Frequently Asked Questions: Claude Sonnet 4 vs Claude 3.5 Sonnet▼

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

▼

Based on the Capability Index, Claude Sonnet 4 scores higher (74.7 vs 67.5). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

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

▼

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

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

▼

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

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

▼

Key differences: Claude Sonnet 4 has a notably higher capability index (7.2 point gap); only Claude Sonnet 4 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 Claude Sonnet 4 and Claude 3.5 Sonnet for free on idapt.app to see which performs better for your specific needs.

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