Anthropic API Claude Sonnet 4 Claude Opus 4 vs OpenAI API GPT-4o o3

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

Verdict: Anthropic API Claude Sonnet 4 Claude Opus 4 wins on performance with its 200K context and reasoning focus while OpenAI API GPT-4o o3 leads in multimodal features. Anthropic offers clearer pricing at $15 per million input tokens and $75 per million output tokens per facts. Both models are listed as discontinued with Anthropic released 2024-03 and OpenAI 2024-05.

Winner: Anthropic API Claude Sonnet 4 Claude Opus 4

Anthropic API Claude Sonnet 4 Claude Opus 4: 7.5/10

OpenAI API GPT-4o o3: 6.5/10

Spec-by-spec comparison

	Anthropic API Claude Sonnet 4 Claude Opus 4	OpenAI API GPT-4o o3
context_window	200K tokens	128K tokens
input_pricing	$15 per million tokens	—
output_pricing	$75 per million tokens	—
strength	complex reasoning and graduate-level analysis	multimodal text image and audio support

Bottom line

Our pick: Anthropic API Claude Sonnet 4 Claude Opus 4.

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