If you're a developer choosing between DeepSeek, ChatGPT, and Claude APIs, the pricing difference is massive. Same task, 10x cost difference.

But the cheapest isn't always the best value.

Pricing (May 2026)

Model Input (per 1M tokens) Output (per 1M tokens)
DeepSeek v4-flash $0.07 $0.28
DeepSeek v4-pro $1.10 $3.30
GPT-4o mini $0.42 $1.65
GPT-4o $3.45 $10.35
Claude Sonnet $2.75 $8.30
Claude Opus $8.30 $24.80

Real Scenarios

Daily Coding (500 calls/day, ~500 tokens each)

  • DeepSeek v4-flash: ~$2/mo
  • GPT-4o mini: ~$12/mo
  • DeepSeek v4-pro: ~$25/mo
  • GPT-4o: ~$77/mo
  • Claude Sonnet: ~$62/mo

Complex Code Review (100 calls/day, ~2000 tokens each)

  • DeepSeek v4-flash: ~$2.5/mo
  • DeepSeek v4-pro: ~$20/mo
  • GPT-4o: ~$62/mo
  • Claude Sonnet: ~$50/mo

Batch Processing (10,000 calls/day, ~100 tokens each)

  • DeepSeek v4-flash: ~$12/mo
  • GPT-4o mini: ~$75/mo
  • DeepSeek v4-pro: ~$99/mo
  • GPT-4o: ~$620/mo

My Selection Rules

  1. Daily tasks → cheapest model. 80% of coding needs are handled by v4-flash. Don't overpay.

  2. Complex tasks → mid-tier (pro/Sonnet). Opus-level is overkill for most scenarios.

  3. Mix models within projects. Write code with flash, debug with pro, documentation with Sonnet.

  4. Hidden costs matter. Cheaper models often need more iterations and more human review — that costs time.

Summary

Use Case Best Model Est. Monthly
Personal coding DeepSeek v4-flash $2-7
Small team DeepSeek v4-pro $15-40
Enterprise ChatGPT GPT-4o + mix $70-280
Batch processing DeepSeek v4-flash $7-28
English content Claude Sonnet $28-110

The cheapest API isn't the most cost-effective. The right API for each task is.