Head to head

GPT-5.5 vs Claude Opus 5.5

Price, context, inputs and filters. No benchmarks theatre.

Swap sides

Claude Opus 5.5 costs 1.3× less per message.

Both hold the same amount of context.

Fact

GPT-5.5OpenAI

MainstreamChat with GPT-5.5

Claude Opus 5.5Anthropic

MainstreamChat with Claude Opus 5.5

Made by

OpenAI

Anthropic

Content tier

Mainstream

Intelligence

Brilliant

Estimated price per message

~16.25 credits≈ 6 messages for 1 €

~12.22 credits≈ 8 messages for 1 €

Context window

1.1M tokens≈ 1,615 pages of text in one go

1M tokens≈ 1,538 pages of text in one go

Reads

Text, Images

Writes

Text

Tool use

Yes - search, memory, code and more

Served via

OpenRouter, Unbottled AI

Status

Legacy

Current

A typical message: 16K tokens in, 1.5K out. Short replies cost less. Models served via OpenRouter bill the real provider cost plus our markup, so actual charges vary. 1 credit = 0.01 €.

GPT-5.5 details Claude Opus 5.5 details