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GPT-5 vs Claude Opus 4.8: price comparison

Real 2026 API prices side by side, with the total cost of a typical 10M-input / 3M-output monthly workload.

Price & cost at a glance

	GPT-5	Claude Opus 4.8
Input / 1M tokens	$1.25	$15
Output / 1M tokens	$10	$75
Context window	400K	300K
Cost — 10M in + 3M out	$42.5	$375

Green = cheaper / larger. Prices per 1M tokens, USD. Snapshot 2026 — verify with the provider.

Which is cheaper?

GPT-5 is the cheaper option on a 10M-in / 3M-out workload — about $42.5/mo versus $375 for Claude Opus 4.8 (~8.8× difference). Because output tokens are billed higher, the model with the lower output price usually wins as your responses get longer.

Run your own token mix in the cost calculator, or see each model in depth: GPT-5 · Claude Opus 4.8.

Frequently asked

Is GPT-5 or Claude Opus 4.8 cheaper?

At a typical 10M input + 3M output tokens per month, GPT-5 costs about $42.5 versus $375 for Claude Opus 4.8 — GPT-5 is roughly 8.8x cheaper on this workload. Your ratio of input to output tokens changes the gap.

What's the price difference between GPT-5 and Claude Opus 4.8?

GPT-5 is $1.25/$10 per 1M input/output tokens; Claude Opus 4.8 is $15/$75. Output tokens usually dominate a bill, so compare the output price first.

Which has the bigger context window, GPT-5 or Claude Opus 4.8?

GPT-5 supports about 400K tokens and Claude Opus 4.8 about 300K. A bigger window costs more per call because every token in context is billed.

Related comparisons

GPT-5 vs Gemini 3.1 Pro Claude Opus 4.8 vs Gemini 3.1 Pro GPT-5 vs Grok 4 GPT-5.5 vs GPT-5 GPT-5 vs DeepSeek R1 All 387 models →

Educational estimates — not affiliated with any provider.