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Model board / GPT-5.6 Terra

GPT-5.6 Terra

latest OpenAI

Verified 2026-09-03 against the pages listed below. Prices are USD per 1M tokens, list rate — no committed-use, enterprise or volume discount.

Input
$2.00
Cached input
$0.2
Cache write
$2.50
Output
$12.00
Context window
1,050,000
Max output
128,000
Weights
closed
Caching
automatic

down from the $2.50/$0.25/$15.00 this board recorded on 2026-07-30; the long-context tier is $4.00/$0.40/$5.00/$18.00. The page names a 272K threshold for gpt-5.5/5.4 but not for the 5.6 series

cached input at 10% of base

Watch out

Reasoning effort silently multiplies the output bill; pin it explicitly

What we would use it for

The default working model — coding, tools, long context

What this has cost, week by week

Output price at each refresh since 2026-07-30. A vendor change is the provider changing its price. Our correction means this board changed what it prints and the provider's charge did not move — the two are never merged, because publishing the second as the first would be a price rise that never happened.

07-30 $15.00→08-06 $12.00→08-14 $12.00→08-20 $12.00→08-27 $12.00→09-03 $12.00
vendor change2026-08-06 · in, cached_in, out — OpenAI cut Terra by 20%, effective 2026-07-30: $2.50/$0.25/$15.00 to $2.00/$0.20/$12.00.
our correction2026-08-06 · cache_write — As above — the page stated the cache-write rate and the board had carried null.

Where these numbers came from

No number on this page was written that was not read from one of those pages on 2026-09-03. If one is wrong, send us the source URL and it is corrected in the next weekly refresh, with a changelog line saying what was wrong — contact@naderu.com.

Jobs this is one of our picks for

The rest of the board

This row sits alongside 53 others on the model board, refreshed every week. The same data as JSON, and the terms for using it, are at /board-data.