The value pick inside OpenAI's lineup; undercuts the prior GPT-5.4 tier.
Terra is the mid-tier of OpenAI's GPT-5.6 family and, for many teams, the one that actually ships to production. It shares the flagship's 1.05M-token context but lands at $2 / $12 per million tokens — a fraction of Sol's output rate — and took a further 20% cut on July 30, 2026.
There is no standalone independent intelligence score for Terra in this survey, and on the hardest reasoning tasks it sits below Sol; the long-context surcharge that applies across the family kicks in at scale here too. What Terra offers is the GPT-5.6 line's balance point: most of the capability, the full context window, and a price that makes high-volume use practical.
For teams on OpenAI's stack who don't need the absolute top of the reasoning curve, Terra is usually the default. Those who do step up to Sol; those optimizing purely for cost drop to Luna or look to the open-weight tier.
FIELD NOTE — Cut 20% on Jul 30. Production default for many teams.
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