Claude Sonnet 5.5 vs DeepSeek V4.1 Flash

Price, context window & benchmark comparison

Anthropic

Claude Sonnet 5.5

Anthropic
$2.00 / $10.00
Input / Output · per 1M tokens
VS
DeepSeek

DeepSeek V4.1 Flash

DeepSeek
$0.30 / $1.20
Input / Output · per 1M tokens
Compare different models
Anthropic
DeepSeek
Verdict: DeepSeek V4.1 Flash is 7.6× cheaper than Claude Sonnet 5.5 on a typical 3:1 input/output mix. Claude Sonnet 5.5 scores higher on the Artificial Analysis Intelligence Index (56 vs 39.5). DeepSeek V4.1 Flash has the larger context window (1M vs 1M).
Claude Sonnet 5.5DeepSeek V4.1 Flash
Input price / 1M$2.00$0.30
Output price / 1M$10.00$1.20
Blended price (3:1)$4.00$0.52
Cached input / 1M$0.20$0.006
Context window1M1M
Max output128K944K
Intelligence index5639.5
Coding index——
Providers831
Best provider uptime (30m)100.0%100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-09-282026-09-10
Retirement——

Cost calculator

FAQ

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

DeepSeek V4.1 Flash is 7.6× cheaper than Claude Sonnet 5.5 on a typical 3:1 input/output mix.

Claude Sonnet 5.5 vs DeepSeek V4.1 Flash: which has a bigger context window?

Claude Sonnet 5.5: 1,000,000 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 5.5 ≈ $9,000, DeepSeek V4.1 Flash ≈ $1,200.

More comparisons