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OpenAI

GPT-5.6 Terra

GPT-5.6 Terra is a OpenAI model with 1.05M context, $2 in / $12 out per million tokens, last verified October 1, 2026. Open weights: no. Public-board scores are linked to the publisher; vendor-only figures stay in the watch-out, not on the board.

OpenAI’s middle GPT-5.6 tier for balancing intelligence and cost, with text/image input and a 1.05M-token context.

Recorded profile verification October 1, 2026Individual provider fields may change

AI model specification details
SpecificationGPT-5.6 Terra
ProviderOpenAI
TierBalanced
Context window1.05M
Max output128K
Input / 1M tokens$2
Output / 1M tokens$12
WeightsClosed
ParametersNot verifiedUnverified
Reasoning levelsnone, low, medium, high, xhigh, max
Modalitiestext, image
API model idgpt-5.6-terra
ReleasedJuly 9, 2026

Pricing tiers: Launch $2.50/$15, reduced to $2/$12 on July 30. Above 272K input the full request bills $4/$18. Cached input $0.20; cache writes $2.50 at short context. Batch $1/$6 at short context. Regional/FedRAMP processing adds 10% where eligible.

Publisher evidence

Published benchmark results

Each result keeps its source date visible. Dates refer to source publication or capture unless the source explicitly states when it measured the result. A missing benchmark is not treated as a zero.

Published benchmark results for GPT-5.6 Terra
BenchmarkScoreSource dateSource
Artificial Analysis Intelligence Index [max]GPT-5.6 Terra (max)422026-10-01Artificial Analysis · View source
Terminal-Bench 2.1Vendor launch table; complete common run settings unverifiedCross-model comparability not verified87.4%2026-07-09OpenAI GPT-5.6 launch table (vendor-reported; effort and experiment date unspecified) · View source
LiveBench77.9%2026-09-05LiveBench official leaderboard (benchmark-owned), max effort · View source

Best for

  • Cost-sensitive production
  • Mixed reasoning workloads
  • High-volume agents

Watch out

GPT-6.1 Sol lists the same $2 input price and a lower $10 output price than Terra’s $12. Compare representative tasks rather than infer quality from token prices or one index. Terra remains listed in the API model catalog.

History

GPT-5.6 Terra timeline

Release and status events for this model that passed two-source verification — dated, sourced, and linked.

Source receipts

Catalog figures for this model were checked against the following sources.

Common questions

GPT-5.6 Terra

Answered from the verified figures on this page rather than general guidance.

How much does GPT-5.6 Terra cost per million tokens?
GPT-5.6 Terra lists base rates of $2 per million input tokens and $12 per million output tokens. Estimate both input and output token volume and any additional charges for your workload. Launch $2.50/$15, reduced to $2/$12 on July 30. Above 272K input the full request bills $4/$18. Cached input $0.20; cache writes $2.50 at short context. Batch $1/$6 at short context. Regional/FedRAMP processing adds 10% where eligible.
What is GPT-5.6 Terra's context window?
GPT-5.6 Terra accepts about 1.05M tokens of context. That only matters if you routinely send very long documents, large codebases, or multi-turn histories that approach that limit.
What is GPT-5.6 Terra best for?
GPT-5.6 Terra is a balanced tier from OpenAI. It suits cost-sensitive production, mixed reasoning workloads, high-volume agents. GPT-6.1 Sol lists the same $2 input price and a lower $10 output price than Terra’s $12. Compare representative tasks rather than infer quality from token prices or one index. Terra remains listed in the API model catalog.
Model comparison catalogBenchmark library