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GPT-5.6 TerraAPI
GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier.
Prices update automatically — checked daily against provider list prices.
- $4.5 per 1M tokens, assuming 3 input for 1 output the convention used by Artificial Analysis
- cheaper than 27% of the 192 commercial models tracked here
- 60 of 88 OpenAI models tracked here, from cheapest
Benchmarks & performance
Independent benchmark scores for GPT-5.6 Terra, measured by Artificial Analysis. Higher is better. Measurement mode: max.
Models at this level cost $4 per 1M tokens (median of 18) — this one costs $4.5.
Cheaper and better on this index: GPT-5.6 Sol · Grok 4.6 · GPT-5.6 Sol (batch) and 5 more
About this model
GPT-5.6 Terra is a commercial AI model by OpenAI. The specifications below are tracked automatically: pricing is refreshed daily from public list prices, so the numbers on this page reflect the current cost of using the model through its API.
Frequently asked questions
What is GPT-5.6 Terra?
GPT-5.6 Terra is an AI language model from OpenAI. It is a proprietary model, available through an API. It scores 56.6 on the Artificial Analysis intelligence index.
Is GPT-5.6 Terra free?
GPT-5.6 Terra is not free: it costs $2 per million input tokens and $12 per million output tokens. Open-weight alternatives can be self-hosted at no per-token cost.
What is GPT-5.6 Terra good at?
Independent benchmarks from Artificial Analysis give it GPQA 92.5%, Humanity's Last Exam 42.9%, Long Context Reasoning 79.7%, SciCode 53.9%, IFBench 71.2%, τ²-Bench 86.3%, τ-Bench Banking 40.2%, Terminal-Bench 88%, Terminal-Bench Hard 57.6%. It is particularly used for code generation.
How fast is GPT-5.6 Terra?
It generates about 106.6 tokens per second, with a median 86.59s delay before the first token. Measured independently by Artificial Analysis.