LLM Reference

Claude 3.7 Sonnet vs Claude Sonnet 4.5

Claude 3.7 Sonnet (2024) and Claude Sonnet 4.5 (2025) are frontier-tier reasoning models from Anthropic. Claude 3.7 Sonnet ships a 200k-token context window, while Claude Sonnet 4.5 ships a 200k-token context window. On MMLU PRO, Claude Sonnet 4.5 leads by 5.7 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.

Pick Claude Sonnet 4.5 for general evaluation; token pricing is tied, so keep Claude 3.7 Sonnet only for already-validated prompts or route constraints.

Decision scorecard

Local evidence first
SignalClaude 3.7 SonnetClaude Sonnet 4.5
Best forreasoning-heavy apps, multimodal apps, and tool-calling agentsreasoning-heavy apps, multimodal apps, and tool-calling agents
Decision fitCoding, RAG, and AgentsCoding, RAG, and Agents
Context window200k200k
Cheapest output$15/1M tokens$15/1M tokens
Provider routes6 tracked8 tracked
Shared benchmarks3 sharedMMLU PRO leader

Decision tradeoffs

Choose Claude 3.7 Sonnet when...
  • Claude 3.7 Sonnet uniquely exposes Code execution in local model data.
  • Local decision data tags Claude 3.7 Sonnet for Coding, RAG, and Agents.
Choose Claude Sonnet 4.5 when...
  • Claude Sonnet 4.5 holds a shared-benchmark lead on MMLU PRO, ahead by 5.7 points.
  • Claude Sonnet 4.5 has broader tracked provider coverage for fallback and route flexibility.
  • Local decision data tags Claude Sonnet 4.5 for Coding, RAG, and Agents.

Monthly cost at traffic

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

Same estimate Tie

Claude 3.7 Sonnet

$6,150

Cheapest tracked route/tier: GCP Vertex AI

Claude Sonnet 4.5

$6,150

Cheapest tracked route/tier: Microsoft Foundry

Estimated monthly gap: $0.00. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Claude 3.7 Sonnet -> Claude Sonnet 4.5
  • Provider overlap exists on Anthropic, Snowflake Cortex, and GCP Vertex AI; start route-level A/B tests there.
  • Cheapest tracked output pricing is tied, so migration risk shifts to quality, latency, and provider packaging.
  • Check replacement coverage for Code execution before moving production traffic.
Claude Sonnet 4.5 -> Claude 3.7 Sonnet
  • Provider overlap exists on Snowflake Cortex, GCP Vertex AI, and Replicate API; start route-level A/B tests there.
  • Cheapest tracked output pricing is tied, so migration risk shifts to quality, latency, and provider packaging.
  • Claude 3.7 Sonnet adds Code execution in local capability data.

Specs

Specification
Released2024-03-042025-09-29
Context window200k200k
Parameters——
ArchitectureDecoder OnlyDecoder Only
LicenseProprietaryProprietary
OpennessProprietaryProprietary
WeightsNot releasedNot released
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: conditional
Knowledge cutoff2024-112025-12

Pricing and availability

Pricing attributeClaude 3.7 SonnetClaude Sonnet 4.5
Input price$3/1M tokens
0-200,001t
$3/1M tokens
200,001t+
$6/1M tokens
Output price$15/1M tokens
0-200,001t
$15/1M tokens
200,001t+
$22.50/1M tokens
Providers
Snowflake CortexGCP Vertex AIReplicate APIOpenRouterAWS BedrockAnthropic
Microsoft FoundryAnthropicSnowflake CortexGCP Vertex AIAWS BedrockReplicate API

Capabilities

CapabilityClaude 3.7 SonnetClaude Sonnet 4.5
VisionYesYes
MultimodalYesYes
ReasoningYesYes
JSON / Tool useYesYes
Structured outputsYesYes
Code executionYesNo
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

BenchmarkClaude 3.7 SonnetClaude Sonnet 4.5
MMLU PRO80.386.0
SWE-bench Verified70.377.2
Massive Multi-discipline Multimodal Understanding75.077.8

Continue comparing

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