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GPT-4o vs Claude 3.5 Sonnet: Full Pricing & Cost Comparison

OpenAI and Anthropic are in a continuous price and capability war. While Claude 3.5 Sonnet and GPT-4o offer similar intelligence, their API costs differ. This comparison analyzes base token rates, caching parameters, and monthly scaling costs.

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1. Comparison Matrix: Sonnet vs. GPT-4o

GPT-4o costs $2.50 / MTok input and $10.00 / MTok output. Claude 3.5 Sonnet costs $3.00 / MTok input and $15.00 / MTok output. Claude's base token pricing is 20% higher on input and 50% higher on output compared to OpenAI.

2. Repetitive Context and Cache Math

If your application relies on repetitive system prompts or static files (RAG), Claude's 90% prompt caching discount ($0.30 / MTok cache-read) makes it cheaper than GPT-4o's 50% discount ($1.25 / MTok cache-read). For static document processing, Claude Sonnet is more economical.

3. Selecting the Best Cost Profile

For general short-prompt chatbots, GPT-4o (or GPT-4o-mini) offers superior unit economics. For complex reasoning, code generation, and context-heavy workflows, Claude 3.5 Sonnet's caching engine matches or beats OpenAI's cost structure.

Frequently Asked Questions

Which model should I use for a low budget?

For low budgets, GPT-4o-mini or Claude 3.5 Haiku are ideal. GPT-4o-mini is the cheapest ($0.15/MTok input, $0.60/MTok output).

Do these costs include fine-tuning?

No. Fine-tuned models have different pricing models, typically charging a premium per-token fee and hourly hosting rates.