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Claude API vs OpenAI API: Price Comparison 2026

Compare Claude Opus, Sonnet, Haiku vs GPT-4o, GPT-4o-mini pricing. See which AI API gives you more value in 2026.

Claude vs OpenAI: Which API Costs Less in 2026?

Choosing between Claude and OpenAI often comes down to two things: capability and cost. Let's break down the real pricing so you can make an informed decision for your project.

Official Pricing: Claude Models

  • Claude Opus 4.6 - $15.00 input / $75.00 output per 1M tokens
  • Claude Sonnet 4.6 - $3.00 input / $15.00 output per 1M tokens
  • Claude Haiku 4.5 - $0.80 input / $4.00 output per 1M tokens

    • Official Pricing: OpenAI Models

  • GPT-4o - $2.50 input / $10.00 output per 1M tokens
  • GPT-4o-mini - $0.15 input / $0.60 output per 1M tokens

    • Head-to-Head: Sonnet vs GPT-4o

    Claude Sonnet 4.6 and GPT-4o are the most commonly compared models. At official pricing, Sonnet costs $3.00/$15.00 while GPT-4o costs $2.50/$10.00 per million tokens. GPT-4o is slightly cheaper on paper.

    But here's where it gets interesting. Through claudeapi.cheap, you can access Sonnet at up to 50% off:

  • Sonnet via claudeapi.cheap - $1.50 input / $7.50 output per 1M tokens
  • GPT-4o official - $2.50 input / $10.00 output per 1M tokens

    • That makes Claude Sonnet 40% cheaper than GPT-4o when you use claudeapi.cheap.

    Real-World Cost Example

    Let's say your app handles 5,000 requests per day, each using 1,000 input tokens and 2,000 output tokens.

    Monthly cost with GPT-4o (official):

  • Input: 150M tokens x $2.50 = $375
  • Output: 300M tokens x $10.00 = $3,000
  • Total: $3,375/month

    • Monthly cost with Claude Sonnet (claudeapi.cheap Ultimate):

  • Input: 150M tokens x $1.50 = $225
  • Output: 300M tokens x $7.50 = $2,250
  • Total: $2,475/month

    • That's $900/month in savings while using a model many developers prefer for coding and reasoning tasks.

    Budget Tier: Haiku vs GPT-4o-mini

    For lightweight tasks, Claude Haiku 4.5 competes with GPT-4o-mini:

  • Haiku via claudeapi.cheap - $0.40 input / $2.00 output per 1M tokens
  • GPT-4o-mini official - $0.15 input / $0.60 output per 1M tokens

    • GPT-4o-mini wins on raw price for simple tasks. But Haiku offers stronger reasoning and longer context, which can reduce the number of API calls you need.

    How claudeapi.cheap Works

    We offer three pricing tiers:

  • Free - 30% off all Claude models, no monthly fee
  • Pro ($29/month) - 40% off all models
  • Ultimate ($49/month) - 50% off all models

    • You use the same Anthropic models with the same quality, context windows, and streaming support. Just change your base URL and API key.

    The Bottom Line

    At official pricing, OpenAI has a slight edge in most tiers. But with claudeapi.cheap discounts, Claude becomes the more affordable option across the board, especially at the Sonnet level where most production apps operate.

    If you value strong coding performance, large context windows, and lower costs, Claude through claudeapi.cheap is the clear winner for 2026.