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Claude 3.5 Sonnet vs DeepSeek V4.1 Flash 1017

At a glance

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

68200K ctx#59/92

DeepSeek's October 2026 checkpoint of the V4.1 Flash workhorse, refreshed for stronger agentic coding with shorter, faster answers.

1.0M ctx$0.15/$0.60 per M
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
Sources:Epoch ECI·Epoch AI· as of 2026-10-02
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
Task Horizon21min
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Capability
Capability—
Reasoning & Knowledge
Graduate Science—Expert-Level—
Math
Math Problems—Competition Math—Research Math—
Coding
Code Editing—
Agentic
Task Horizon—
Specs
200K
Context
8K
Max output
—
Released
1.0M
Context
256K
Max output
Oct 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Pricing not available
Live pricing, shown before you run
Input$0.15/M tokens
Output$0.60/M tokens
Cache read$0.003/M tokens
Chat with Claude 3.5 SonnetGo to model
Chat with DeepSeek V4.1 Flash 1017Go to model
Frequently Asked Questions: Claude 3.5 Sonnet vs DeepSeek V4.1 Flash 1017▼

Which is better, Claude 3.5 Sonnet or DeepSeek V4.1 Flash 1017?

▼

Both Claude 3.5 Sonnet and DeepSeek V4.1 Flash 1017 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 has a larger context window, Claude 3.5 Sonnet or DeepSeek V4.1 Flash 1017?

▼

DeepSeek V4.1 Flash 1017 has a larger context window: Claude 3.5 Sonnet supports 200K tokens vs DeepSeek V4.1 Flash 1017 at 1M tokens.

Do both Claude 3.5 Sonnet and DeepSeek V4.1 Flash 1017 support vision?

▼

Yes, both Claude 3.5 Sonnet and DeepSeek V4.1 Flash 1017 support vision/image input.

What are the key differences between Claude 3.5 Sonnet and DeepSeek V4.1 Flash 1017?

▼

Key differences: only DeepSeek V4.1 Flash 1017 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 3.5 Sonnet and DeepSeek V4.1 Flash 1017 for free on idapt.app to see which performs better for your specific needs.

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