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OpenAI

GPT-5.6 Terra

Benchmarks, price, context and versions

Also searched as

GPT 5.6 Terra, GPT-5.6-Terra

Direct answer: GPT-5.6 Terra is a model from OpenAI. 93.3% on GPQA Diamond, per Epoch AI. On OpenRouter, US$ 2.00 per 1 million input tokens and US$ 12.00 per 1 million output tokens.

✓ Good for

  • technical reasoning on science topics (#21 of 198 on GPQA Diamond)
  • calculation and problems with an exact answer (#16 of 186 on OTIS Mock AIME)
  • the ceiling of reasoning on research-level math (#13 of 86 on FrontierMath (tiers 1 to 3))
  • very long documents or code (a window of 1 million tokens or more, according to OpenRouter)

✕ Not the best for

  • answering short facts with little invention (#44 of 87 on SimpleQA Verified)
  • agents that follow rules and use tools (#77 of 131 on τ-bench Verified (airline))
  • when the input budget sits at the top of the table (input price in the highest 25% on OpenRouter)

This block follows a rule of this section, using source data: if the model is in the top 25% of the metric, the item goes under "Good for"; if it is in the bottom half, it goes under "Not the best for". The middle band appears in neither. Price and context use OpenRouter; scores use Epoch AI or OpenRouter Benchmarks, in the latest version we checked.

Benchmarks

GPQA Diamond

?what it is
93.3%

highest score on this metric 96.4%

21º / 198 · Epoch AI, latest version we checked

OTIS Mock AIME

?
99.7%

highest score on this metric 100%

16º / 186 · Epoch AI, latest version we checked

FrontierMath (tiers 1 to 3)

?
86%

highest score on this metric 95.1%

13º / 86 · Epoch AI, latest version we checked

SimpleQA Verified

?
43.2%

highest score on this metric 94%

44º / 87 · Epoch AI, latest version we checked

GPQA Diamond (OpenRouter)

?
89.3%

highest score on this metric 96.5%

47º / 135 · OpenRouter Benchmarks, latest version we checked

τ-bench Verified (airline)

?
72.3%

highest score on this metric 82%

77º / 131 · OpenRouter Benchmarks, latest version we checked

Key specs

Origin
the US
Family
GPT Terra provisional data
Weights?
closed
License
no data
Input US$/1M?
US$ 2.00
Output US$/1M
US$ 12.00
Context?
1,050,000 tokens
Parameters
no data
Input
file, image, text
OpenRouter usage?
no data
Downloads (30 days)?
no data
Use cases provisional data
Text Agents
Dates in sources
  • 2026, published, per Epoch AI
  • 2026, listed on OpenRouter

Version history

Dates come from the sources: OpenRouter listing or Hugging Face repo creation, which may differ from the official launch.

FAQ

What is GPT-5.6 Terra?

GPT-5.6 Terra is a model from OpenAI, with closed weights, used for text, agents.

How much does GPT-5.6 Terra cost?

On OpenRouter, US$ 2.00 per 1 million input tokens and US$ 12.00 per 1 million output tokens.

What is the context window of GPT-5.6 Terra?

1,050,000 tokens, per OpenRouter.

Is GPT-5.6 Terra open source?

No. It is available through API only.

What is GPT-5.6 Terra's GPQA Diamond score?

93.3% on GPQA Diamond, per Epoch AI.

Is GPT-5.6 Terra good for coding?

No data: there is no SWE-bench Verified measurement for it in open sources.

Who made GPT-5.6 Terra?

It was made by OpenAI, a lab from the US.

provisional data Questions under review: Semrush had no API balance during collection. Answers use source data only.

Models from OpenAI

See lab

Sources

  • Epoch AI, CC BY 4.0, latest version we checked.
  • OpenRouter, dados públicos da API; exports de benchmarks e rankings em CC BY 4.0, latest version we checked.
  • OpenRouter Benchmarks, CC BY 4.0, latest version we checked.

Dates come from the sources: OpenRouter listing or Hugging Face repo creation, which may differ from the official launch. Family and version were grouped by rule from the name.