Model comparison · updated 2026-07-28

GPT-5.6 TerravsGPT-5.5

Side-by-side pricing for1 million tokens

Price comparison

GPT-5.6 TerraGPT-5.5Verdict
ProviderOpenAIOpenAI--
Context window1.05M400K--
Input / 1M tokens$2.50$5GPT-5.6 Terra is 2x cheaper
Output / 1M tokens$15$30GPT-5.6 Terra is 2x cheaper
Output:input ratio6x6x--
Tierflagshipflagship--

GPT-5.5: Long-context (>272K input) priced at 2× input / 1.5× output.

What does $10 buy?

$10 of input

GPT-5.6 Terra

4,000,000 tokens

GPT-5.5

2,000,000 tokens

GPT-5.6 Terra gives you 2x more input for the same budget.

$10 of output

GPT-5.6 Terra

666,667 tokens

GPT-5.5

333,333 tokens

GPT-5.6 Terra gives you 2x more output for the same budget.

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