LLM Reference

Claude 3.5 Sonnet vs GPT-4o (08-06)

Claude 3.5 Sonnet (2024) and GPT-4o (08-06) (2024) are frontier reasoning models from Anthropic and OpenAI. Claude 3.5 Sonnet ships a 200k-token context window, while GPT-4o (08-06) ships a 128k-token context window. On MMLU PRO, Claude 3.5 Sonnet leads by 2.5 pts. On pricing, GPT-4o (08-06) costs $2.50/1M 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.

GPT-4o (08-06) is safer overall; choose Claude 3.5 Sonnet when coding workflow support matters.

Decision scorecard

Local evidence first
SignalClaude 3.5 SonnetGPT-4o (08-06)
Best forreasoning-heavy apps, multimodal apps, and tool-calling agentsmultimodal apps and provider-routed production
Decision fitCoding, RAG, and AgentsCoding, RAG, and Agents
Context window200k128k
Cheapest output$15/1M tokens$10/1M tokens
Provider routes6 tracked3 tracked
Shared benchmarksMMLU PRO leader2 shared

Decision tradeoffs

Choose Claude 3.5 Sonnet when...
  • Claude 3.5 Sonnet holds a shared-benchmark lead on MMLU PRO, ahead by 2.5 points.
  • Claude 3.5 Sonnet has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • Claude 3.5 Sonnet has broader tracked provider coverage for fallback and route flexibility.
  • Claude 3.5 Sonnet uniquely exposes Reasoning and JSON / Tool use in local model data.
  • Local decision data tags Claude 3.5 Sonnet for Coding, RAG, and Agents.
Choose GPT-4o (08-06) when...
  • GPT-4o (08-06) has the lower cheapest tracked output price at $10/1M tokens.
  • Local decision data tags GPT-4o (08-06) 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 GPT-4o (08-06)

Claude 3.5 Sonnet

$6,150

Cheapest tracked route/tier: GCP Vertex AI

GPT-4o (08-06)

$4,500

Cheapest tracked route/tier: OpenAI API

Estimated monthly gap: $1,650. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Claude 3.5 Sonnet -> GPT-4o (08-06)
  • Provider overlap exists on OpenRouter; start route-level A/B tests there.
  • GPT-4o (08-06) is $5/1M 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.
GPT-4o (08-06) -> Claude 3.5 Sonnet
  • Provider overlap exists on OpenRouter; start route-level A/B tests there.
  • Claude 3.5 Sonnet is $5/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • Claude 3.5 Sonnet adds Reasoning and JSON / Tool use in local capability data.

Specs

Specification
Released2024-06-202024-08-06
Context window200k128k
Parameters70B1.76T (8x222B MoE)*
ArchitectureDecoder OnlyMixture of Experts
LicenseProprietaryProprietary
OpennessProprietaryProprietary
WeightsNot releasedNot released
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: conditional
Knowledge cutoff2024-042023-10

Pricing and availability

Pricing attributeClaude 3.5 SonnetGPT-4o (08-06)
Input price$3/1M tokens$2.50/1M tokens
Output price$15/1M tokens$10/1M tokens
Providers
GCP Vertex AIAWS BedrockAnthropicOpenRouterMicrosoft FoundryReplicate API
OpenAI APISalesforce Einstein Generative AIOpenRouter

Capabilities

CapabilityClaude 3.5 SonnetGPT-4o (08-06)
VisionYesYes
MultimodalYesYes
ReasoningYesNo
JSON / Tool useYesNo
Structured outputsYesYes
Code executionYesYes
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

BenchmarkClaude 3.5 SonnetGPT-4o (08-06)
MMLU PRO77.274.7
Aider Polyglot51.623.1

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