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Claude Sonnet 5.5 vs DeepSeek V4 Flash

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

Efficiency-optimized DeepSeek V4 at 284B total / 13B active for fast, high-throughput inference.

1.0M ctx$0.04/$0.08 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
Cheaper99%
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—
Specs
1M
Context
128K
Max output
Sep 2026
Released
1.0M
Context
131K
Max output
Apr 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$0.20/M tokens
Cache write$2.50/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input98%$0.04/M tokens
Output99%$0.08/M tokens
Cache read96%$0.008/M tokens
Chat with Claude Sonnet 5.5Go to model
Chat with DeepSeek V4 FlashGo to model
Frequently Asked Questions: Claude Sonnet 5.5 vs DeepSeek V4 Flash▼

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

▼

Both Claude Sonnet 5.5 and DeepSeek V4 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, Claude Sonnet 5.5 or DeepSeek V4 Flash?

▼

DeepSeek V4 Flash has a lower blended cost. Claude Sonnet 5.5: $2.00 input / $10.00 output. DeepSeek V4 Flash: $0.04 input / $0.08 output.

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

▼

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

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

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Claude Sonnet 5.5 supports vision/image input, but DeepSeek V4 Flash does not.

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

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Key differences: DeepSeek V4 Flash is significantly cheaper; only Claude Sonnet 5.5 supports vision input. Compare full specs on this page.

Which model should I choose for my use case?

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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 Flash for free on idapt.app to see which performs better for your specific needs.

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