LLM Reference

Claude 3.7 Sonnet vs Claude Opus 4.6

Claude 3.7 Sonnet (2024) and Claude Opus 4.6 (2026) are frontier-tier reasoning models from Anthropic. Claude 3.7 Sonnet ships a 200k-token context window, while Claude Opus 4.6 ships a 1m-token context window. On MMLU PRO, Claude Opus 4.6 leads by 8.8 pts. On pricing, Claude 3.7 Sonnet costs $3/1M input tokens versus $5/1M 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.

Claude 3.7 Sonnet is ~67% cheaper at $3/1M; pay for Claude Opus 4.6 only for coding workflow support.

Decision scorecard

Local evidence first
SignalClaude 3.7 SonnetClaude Opus 4.6
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 window200k1m
Cheapest output$15/1M tokens$25/1M tokens
Provider routes6 tracked6 tracked
Shared benchmarks6 sharedMMLU PRO leader

Decision tradeoffs

Choose Claude 3.7 Sonnet when...
  • Claude 3.7 Sonnet has the lower cheapest tracked output price at $15/1M tokens.
  • Local decision data tags Claude 3.7 Sonnet for Coding, RAG, and Agents.
Choose Claude Opus 4.6 when...
  • Claude Opus 4.6 holds a shared-benchmark lead on MMLU PRO, ahead by 8.8 points.
  • Claude Opus 4.6 has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • Local decision data tags Claude Opus 4.6 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.

Lower estimate Claude 3.7 Sonnet

Claude 3.7 Sonnet

$6,150

Cheapest tracked route/tier: GCP Vertex AI

Claude Opus 4.6

$10,250

Cheapest tracked route/tier: Anthropic

Estimated monthly gap: $4,100. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Claude 3.7 Sonnet -> Claude Opus 4.6
  • Provider overlap exists on Anthropic, AWS Bedrock, and GCP Vertex AI; start route-level A/B tests there.
  • Claude Opus 4.6 is $10/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
Claude Opus 4.6 -> Claude 3.7 Sonnet
  • Provider overlap exists on GCP Vertex AI, OpenRouter, and AWS Bedrock; start route-level A/B tests there.
  • Claude 3.7 Sonnet is $10/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.

Specs

Specification
Released2024-03-042026-02-05
Context window200k1m
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 Opus 4.6
Input price$3/1M tokens$5/1M tokens
Output price$15/1M tokens$25/1M tokens
Providers
Snowflake CortexGCP Vertex AIReplicate APIOpenRouterAWS BedrockAnthropic
AnthropicAWS BedrockGCP Vertex AIMicrosoft FoundryOpenRouterVercel AI Gateway

Capabilities

CapabilityClaude 3.7 SonnetClaude Opus 4.6
VisionYesYes
MultimodalYesYes
ReasoningYesYes
JSON / Tool useYesYes
Structured outputsYesYes
Code executionYesYes
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

BenchmarkClaude 3.7 SonnetClaude Opus 4.6
MMLU PRO80.389.1
SWE-bench Verified70.380.8
LiveCodeBench68.970.2
Massive Multi-discipline Multimodal Understanding75.076.5
HumanEval93.095.0
Aider Polyglot64.972.0

Continue comparing

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