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  5. Claude Sonnet 5vsDeepSeek V3.1
Updated Jun 2026

Claude Sonnet 5vsDeepSeek V3.1

DeepSeek V3.1 is cheaper than Claude Sonnet 5 at $0.2/M vs $2/M input tokens.

Claude Sonnet 5 and DeepSeek V3.1 compared across 53 shared prompts
SpecClaude Sonnet 5DeepSeek V3.1
Input price$2/M tokens$0.2/M tokens
Output price$10/M tokens$0.8/M tokens
Context window1.0M tokens164K tokens
WeightsClosedOpen
Free API (OpenRouter)NoNo
ReleasedJun 2026Aug 2025
Our Verdict
Claude Sonnet 5
Claude Sonnet 5
DeepSeek V3.1
DeepSeek V3.1

Not enough votes to call it. On the specs, nothing separates them.

DeepSeek V3.1 costs 13x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Sonnet 5
Input
$2.00
Output
$10.00
DeepSeek V3.1
Input
$0.20
10× cheaper
Output
$0.80
13× cheaper

DeepSeek V3.1 is cheaper on both: 10× input, 13× output.

Where to run it

12 hosts, cheapest first

Claude Sonnet 54 hosts
HostInOutContextUptime
Amazon Bedrock$2.00 in·$10.00 out·1M·100% upAzure AI Foundry$2.00 in·$10.00 out·1M·99.9% upAnthropic$2.00 in·$10.00 out·1M·100% upGoogle Vertex AI$2.00 in·$10.00 out·1M·99.7% up
DeepSeek V3.18 hosts
HostInOutContextUptime
DDeepInfrafp4$0.25 in·$0.95 out·164k·100% upNNovitafp8$0.27 in·$1.00 out·131k·99.8% upSSiliconFlowfp8$0.27 in·$1.00 out·164k·97.6% upAAtlasCloudfp8$0.30 in·$0.95 out·131k·99.6% upCCoreWeavefp8$0.55 in·$1.65 out·161k·100% upMMara$0.60 in·$1.70 out·131k·91.6% up
2 more hostsFewer hosts
SSambaNovafp8$0.65 in·$1.50 out·131k·98% upGoogle Vertex AIdegraded$0.60 in·$1.70 out·164k·0% up

Per million tokens. Prices and uptime via OpenRouter, checked 11 Sep 2026.

Writing DNA

Style Comparison

Similarity
16%

Claude Sonnet 5 uses 36.8x more emoji

Claude Sonnet 5
DeepSeek V3.1
59%Vocabulary53%
35wSentence Length16w
0.53Hedging0.41
3.5Bold4.3
3.5Lists3.8
0.79Emoji0.02
1.25Headings0.40
0.06Transitions0.20
Based on 27 + 25 text responses
Research

What we learned reading every model

FAQ

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