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Claude Sonnet 5.5 vs DeepSeek V4.1 Flash 1017

At a glance

Anthropic's Sonnet-class model for well-scoped everyday work, a direct upgrade over Claude Sonnet 5.

1M ctx$2.00/$10.00 per M

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
Reasoning
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Reasoning & Knowledge
Graduate Science95.6%Factual Recall46.5%
Math
Competition Math100.0%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper93%
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—
Specs
1M
Context
128K
Max output
Sep 2026
Released
1.0M
Context
256K
Max output
Oct 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$2.00/M tokens
Output$10.00/M tokens
Cache read$0.10/M tokens
Cache write$2.50/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input93%$0.15/M tokens
Output94%$0.60/M tokens
Cache read97%$0.003/M tokens
Chat with Claude Sonnet 5.5Go to model
Chat with DeepSeek V4.1 Flash 1017Go to model
Frequently Asked Questions: Claude Sonnet 5.5 vs DeepSeek V4.1 Flash 1017▼

Which is better, Claude Sonnet 5.5 or DeepSeek V4.1 Flash 1017?

▼

Both Claude Sonnet 5.5 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 is cheaper, Claude Sonnet 5.5 or DeepSeek V4.1 Flash 1017?

▼

DeepSeek V4.1 Flash 1017 has a lower blended cost. Claude Sonnet 5.5: $2.00 input / $10.00 output. DeepSeek V4.1 Flash 1017: $0.15 input / $0.60 output.

Which has a larger context window, Claude Sonnet 5.5 or DeepSeek V4.1 Flash 1017?

▼

DeepSeek V4.1 Flash 1017 has a larger context window: Claude Sonnet 5.5 supports 1M tokens vs DeepSeek V4.1 Flash 1017 at 1M tokens.

Do both Claude Sonnet 5.5 and DeepSeek V4.1 Flash 1017 support vision?

▼

Yes, both Claude Sonnet 5.5 and DeepSeek V4.1 Flash 1017 support vision/image input.

What are the key differences between Claude Sonnet 5.5 and DeepSeek V4.1 Flash 1017?

▼

Key differences: DeepSeek V4.1 Flash 1017 is significantly cheaper. 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 5.5 and DeepSeek V4.1 Flash 1017 for free on idapt.app to see which performs better for your specific needs.

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