LLM Reference

Claude 3.7 Sonnet vs Grok-3

Claude 3.7 Sonnet (2024) and Grok-3 (2025) are frontier-tier reasoning models from Anthropic and xAI. Claude 3.7 Sonnet ships a 200k-token context window, while Grok-3 ships a 131k-token context window. On MMLU PRO, Claude 3.7 Sonnet leads by 0.4 pts. On pricing, Grok-3 costs $0.80/1M 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.

Grok-3 is ~275% cheaper at $0.80/1M; pay for Claude 3.7 Sonnet only for coding workflow support.

Decision scorecard

Local evidence first
SignalClaude 3.7 SonnetGrok-3
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 window200k131k
Cheapest output$15/1M tokens$2.40/1M tokens
Provider routes6 tracked4 tracked
Shared benchmarksMMLU PRO leader5 shared

Decision tradeoffs

Choose Claude 3.7 Sonnet when...
  • Claude 3.7 Sonnet holds a shared-benchmark lead on MMLU PRO, ahead by 0.4 points.
  • Claude 3.7 Sonnet has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • Claude 3.7 Sonnet has broader tracked provider coverage for fallback and route flexibility.
  • 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 Grok-3 when...
  • Grok-3 holds a shared-benchmark lead on LiveCodeBench, ahead by 10.5 points.
  • Grok-3 has the lower cheapest tracked output price at $2.40/1M tokens.
  • Local decision data tags Grok-3 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 Grok-3

Claude 3.7 Sonnet

$6,150

Cheapest tracked route/tier: GCP Vertex AI

Grok-3

$1,240

Cheapest tracked route/tier: Chutes AI

Estimated monthly gap: $4,910. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Claude 3.7 Sonnet -> Grok-3
  • Provider overlap exists on OpenRouter; start route-level A/B tests there.
  • Grok-3 is $12.60/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
  • Check replacement coverage for Code execution before moving production traffic.
Grok-3 -> Claude 3.7 Sonnet
  • Provider overlap exists on OpenRouter; start route-level A/B tests there.
  • Claude 3.7 Sonnet is $12.60/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • Claude 3.7 Sonnet adds Code execution in local capability data.

Specs

Specification
Released2024-03-042025-02-17
Context window200k131k
Parameters——
ArchitectureDecoder Only-
LicenseProprietaryProprietary
OpennessProprietaryProprietary
WeightsNot releasedNot released
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: conditional
Knowledge cutoff2024-112025-04

Pricing and availability

Pricing attributeClaude 3.7 SonnetGrok-3
Input price$3/1M tokens$0.80/1M tokens
Output price$15/1M tokens$2.40/1M tokens
Providers
Snowflake CortexGCP Vertex AIReplicate APIOpenRouterAWS BedrockAnthropic
OpenRouterxAI ConsoleChutes AIMicrosoft Foundry

Capabilities

CapabilityClaude 3.7 SonnetGrok-3
VisionYesYes
MultimodalYesYes
ReasoningYesYes
JSON / Tool useYesYes
Structured outputsYesYes
Code executionYesNo
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

BenchmarkClaude 3.7 SonnetGrok-3
MMLU PRO80.379.9
LiveCodeBench68.979.4
Massive Multi-discipline Multimodal Understanding75.078.0
HumanEval93.094.5
Aider Polyglot64.953.3

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