GPT-5.6 Terra API Pricing
$2.00 input · $12.00 output per 1M tokens — the balanced middle of the GPT-5.6 lineup.
GPT-5.6 Terra sits between the flagship Sol and the ultra-cheap Luna: $2.00 input and $12.00 output per million tokens, with cached input at $0.20. Cut 20% on July 30, 2026, it's the default for workloads that need more headroom than Luna without paying for Sol's ceiling.
Price per 1M tokens
GPT-5.6 Terra · USD official list price
| Tier | Rate |
|---|---|
| Input | $2.00 |
| Output | $12.00 |
| Cache hit | $0.20 |
DeepSeek lists official prices in CNY; USD uses ≈ 6.9 exchange rate
Best for
$2.00 / $12.00
Mid-tier list price for input and output per million tokens.
$0.20 cached input
Cached input at one-tenth of the uncached rate.
20% cut in July 2026
Terra was reduced 20% on July 30, 2026, improving its value positioning.
Typical agent loops and production coding where you want more reliability headroom than budget models, but output-heavy work makes Sol's flagship price hard to justify.
Billing notes
Published API pricing as of September 2026, standard tier, USD per million tokens. Qualifies for OpenAI's 50% Batch API discount on offline workloads.
Terra vs the competition
Against Claude Sonnet 5 ($2/$10) Terra is priced head-to-head with slightly richer output per dollar on agent-heavy mixes; against DeepSeek V4 Pro, Terra's $12.00 output is cheaper than V4 Pro's ¥27.00 peak but V4 Pro wins decisively at off-peak.
Frequently Asked Questions
What is the price of GPT-5.6 Terra per million tokens?
GPT-5.6 Terra bills $2.00 per million input tokens and $12.00 per million output tokens, with cached input at $0.20 per million. It was cut 20% on July 30, 2026, and qualifies for OpenAI's 50% Batch API discount.
How does Terra compare to Luna and Sol?
Terra sits squarely between the flagship Sol ($5/$30) and the ultra-cheap Luna ($0.20/$1.20). It is the mid-tier choice for workloads that need more headroom than Luna but don't justify Sol's flagship price.
Is Terra good for agentic coding workloads?
For typical agent loops Terra is a balanced default — far cheaper than Sol on output-heavy work, with more reliability headroom than budget models. Model your exact token mix before committing, since output-heavy agent loops can flip the ranking.
Related model pricing
Compare this model against the rest of the lineup.
Estimate your exact cost
Model your own workload — input/output tokens, cache hit rate, and peak-hour share — against any model mix with the interactive pricing calculator.
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