LLM Reference

Claude 3.7 Sonnet vs DeepSeek V3.1

Claude 3.7 Sonnet (2024) and DeepSeek V3.1 (2025) are frontier reasoning models from Anthropic and DeepSeek. Claude 3.7 Sonnet ships a 200k-token context window, while DeepSeek V3.1 ships a 64k-token context window. On MMLU PRO, DeepSeek V3.1 leads by 3 pts. On pricing, DeepSeek V3.1 costs $0.27/1M input tokens versus $3/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.

DeepSeek V3.1 is ~1011% cheaper at $0.27/1M; pay for Claude 3.7 Sonnet only for coding workflow support.

Decision scorecard

Local evidence first
SignalClaude 3.7 SonnetDeepSeek V3.1
Best forreasoning-heavy apps, multimodal apps, and tool-calling agentsmultimodal apps and provider-routed production
Decision fitCoding, RAG, and AgentsCoding, Agents, and Vision
Context window200k64k
Cheapest output$15/1M tokens$1/1M tokens
Provider routes6 tracked8 tracked
Shared benchmarks2 sharedMMLU PRO leader

Decision tradeoffs

Choose Claude 3.7 Sonnet when...
  • Claude 3.7 Sonnet holds a shared-benchmark lead on SWE-bench Verified, ahead by 4.3 points.
  • Claude 3.7 Sonnet has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • Claude 3.7 Sonnet uniquely exposes Reasoning and JSON / Tool use in local model data.
  • Local decision data tags Claude 3.7 Sonnet for Coding, RAG, and Agents.
Choose DeepSeek V3.1 when...
  • DeepSeek V3.1 holds a shared-benchmark lead on MMLU PRO, ahead by 3 points.
  • DeepSeek V3.1 has the lower cheapest tracked output price at $1/1M tokens.
  • DeepSeek V3.1 has broader tracked provider coverage for fallback and route flexibility.
  • Local decision data tags DeepSeek V3.1 for Coding, Agents, and Vision.

Monthly cost at traffic

Estimate token spend from the cheapest tracked input and output route or tier on this page.

Lower estimate DeepSeek V3.1

Claude 3.7 Sonnet

$6,150

Cheapest tracked route/tier: GCP Vertex AI

DeepSeek V3.1

$466

Cheapest tracked route/tier: Novita AI

Estimated monthly gap: $5,684. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Claude 3.7 Sonnet -> DeepSeek V3.1
  • Provider overlap exists on AWS Bedrock and Replicate API; start route-level A/B tests there.
  • DeepSeek V3.1 is $14/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
  • Check replacement coverage for Reasoning and JSON / Tool use before moving production traffic.
DeepSeek V3.1 -> Claude 3.7 Sonnet
  • Provider overlap exists on Replicate API and AWS Bedrock; start route-level A/B tests there.
  • Claude 3.7 Sonnet is $14/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • Claude 3.7 Sonnet adds Reasoning and JSON / Tool use in local capability data.

Specs

Specification
Released2024-03-042025-08-21
Context window200k64k
Parameters—671B total, 37B active (MoE)
ArchitectureDecoder OnlyMixture of Experts
LicenseProprietaryMITOSI-approved
OpennessProprietaryOpen source
WeightsNot releasedUnknown
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: permitted
Knowledge cutoff2024-11-

Pricing and availability

Pricing attributeClaude 3.7 SonnetDeepSeek V3.1
Input price$3/1M tokens$0.27/1M tokens
Output price$15/1M tokens$1/1M tokens
Providers
Snowflake CortexGCP Vertex AIReplicate APIOpenRouterAWS BedrockAnthropic
Microsoft FoundryFireworks AINVIDIA NIMTogether AIAWS BedrockReplicate API

Capabilities

CapabilityClaude 3.7 SonnetDeepSeek V3.1
VisionYesYes
MultimodalYesYes
ReasoningYesNo
JSON / Tool useYesNo
Structured outputsYesYes
Code executionYesYes
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

BenchmarkClaude 3.7 SonnetDeepSeek V3.1
MMLU PRO80.383.3
SWE-bench Verified70.366.0

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Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.