Claude Sonnet 4 vs DeepSeek V4.1 Flash

Price, context window & benchmark comparison

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Claude Sonnet 4

Anthropic
$3.00 / $15.00
Input / Output · per 1M tokens
VS
D

DeepSeek V4.1 Flash

DeepSeek
$0.14 / $0.42
Input / Output · per 1M tokens
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Verdict: DeepSeek V4.1 Flash is 28.6× cheaper than Claude Sonnet 4 on a typical 3:1 input/output mix. DeepSeek V4.1 Flash has the larger context window (1M vs 200K).
Claude Sonnet 4DeepSeek V4.1 Flash
Input price / 1M$3.00$0.14
Output price / 1M$15.00$0.42
Blended price (3:1)$6.00$0.21
Cached input / 1M$0.30$0.0042
Context window200K1M
Max output64K131K
Intelligence index39.5
Coding index37.6
Providers26
Best provider uptime (30m)100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2025-05-222026-09-10
Retirement

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FAQ

Which is cheaper, Claude Sonnet 4 or DeepSeek V4.1 Flash?

DeepSeek V4.1 Flash is 28.6× cheaper than Claude Sonnet 4 on a typical 3:1 input/output mix.

Claude Sonnet 4 vs DeepSeek V4.1 Flash: which has a bigger context window?

Claude Sonnet 4: 200,000 tokens. DeepSeek V4.1 Flash: 1,048,576 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Claude Sonnet 4 ≈ $13,500, DeepSeek V4.1 Flash ≈ $490.00.

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