Is Anthropic: Claude Opus 4 or OpenAI: GPT-5 Pro cheaper?

Anthropic: Claude Opus 4 is cheaper on output tokens ($75.00 vs $120.00 per 1M).

Which has the larger context window, Anthropic: Claude Opus 4 or OpenAI: GPT-5 Pro?

OpenAI: GPT-5 Pro has the larger context window (400K tokens).

Anthropic: Claude Opus 4 vs OpenAI: GPT-5 Pro

Anthropic: Claude Opus 4 is cheaper on output tokens, while OpenAI: GPT-5 Pro offers a larger context window. Choose Anthropic: Claude Opus 4 or OpenAI: GPT-5 Pro based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	Anthropic: Claude Opus 4	OpenAI: GPT-5 Pro
Provider	Kilo Gateway	Kilo Gateway
Input / 1M tokens	$15.00	$15.00
Output / 1M tokens	$75.00	$120.00
Context window	200K	400K
Parameters	—	—
Open weights	No	No
Released	May 2025	Oct 2025

Anthropic: Claude Opus 4 details →OpenAI: GPT-5 Pro details →

FAQ

Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.