Claude Sonnet 4 API vs GPT-4o API

By Billy G. · Founder & Lead EditorVerified Oct 5 by Billy G.

Claude Sonnet 4 API
Claude Sonnet 4 API
GPT-4o API

Verdict: GPT-4o edges out Claude Sonnet 4 in raw performance (8 vs 7 on benchmark latency per OpenAI), offers a larger multimodal feature set (vision/audio support per OpenAI API docs) and a clearer pricing structure ($5/$15 per M tokens vs Claude’s higher rates per Anthropic). Claude remains strong on instruction fidelity and lower hallucination (Anthropic safety report). For most developers needing multimodal capabilities and tighter budgets, GPT‑4o is the better choice, while Claude suits enterprises prioritizing consistent tone and safety.

Winner: GPT-4o API

Claude Sonnet 4 API: 7.5/10

GPT-4o API: 8/10

Spec-by-spec comparison

Claude Sonnet 4 APIGPT-4o API
context_window—128k tokens
max_output_tokens—4k tokens
input_price_per_1M—5 USD
output_price_per_1M—15 USD

Claude Sonnet 4 API

What works

  • Strong instruction-following
  • Low hallucination rate
  • Consistent tone

What doesn't

  • Higher cost per token than some rivals
  • Limited multimodal support

GPT-4o API

What works

  • Fast multimodal responses
  • Broad tool integration
  • Competitive pricing

What doesn't

  • Occasional factual errors
  • Context window smaller than some rivals

Bottom line

Our pick: GPT-4o API.

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