Is GPT-5.6 Sol or Claude Opus 5 cheaper?

They cost the same on input, $5.00 per million. Compare output rates and context window instead.

Which has the larger context window?

GPT-5.6 Sol, at 1,050,000 tokens against 1,000,000.

Can I compare them on my own prompt?

Yes. The calculator counts any text against every model at once, so you can see both figures for your actual workload rather than for a generic example.

GPT-5.6 Sol vs Claude Opus 5

The flagship from each provider, and what the difference costs.

Side by side

Attribute	GPT-5.6 Sol	Claude Opus 5
Input, per 1M tokens	$5.00	$5.00
Output, per 1M tokens	$30.00	$25.00
Context window	1,050,000	1,000,000
Provider	OpenAI	Anthropic
Tokenizer	o200k_base	Anthropic tokenizer
Long-context tier	above 272,000	none
Retires	no date announced	no date announced

Which to choose

On cost, input rates are identical, so the decision rests on output rate and capacity.
On capacity, GPT-5.6 Sol holds more in one request. That matters only if you are near the smaller ceiling — below it, the extra room changes nothing.
On long prompts, at least one of these bills the entire request at an elevated rate past a threshold. A comparison made on short prompts can invert once you cross it.

What this page does not tell you. Which model produces better answers. That depends on your task, and this site has no benchmark data — everything above is drawn from published pricing and specifications. Compare quality by running your own prompts through both.

Count your prompt on both GPT-5.6 Sol details Claude Opus 5 details

Common questions

Is GPT-5.6 Sol or Claude Opus 5 cheaper?: They cost the same on input, $5.00 per million. Compare output rates and context window instead.
Which has the larger context window?: GPT-5.6 Sol, at 1,050,000 tokens against 1,000,000.
Can I compare them on my own prompt?: Yes. The calculator counts any text against every model at once, so you can see both figures for your actual workload rather than for a generic example.