When was GPT-5.6 Terra released?

GPT-5.6 Terra was released by OpenAI on Friday, Jun 26 2026.

Who made GPT-5.6 Terra?

GPT-5.6 Terra was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.

How much does GPT-5.6 Terra cost?

GPT-5.6 Terra costs $2.00 per million input tokens and $12.00 per million output tokens through the OpenAI API. Cached input is $0.20 per million tokens. Those are the rates for the “Up to 272K input tokens” tier; 1 other pricing tier is published for this model. Rates are pay-as-you-go API prices verified against OpenAI's published pricing on August 18, 2026.

What benchmark scores did GPT-5.6 Terra get?

GPT-5.6 Terra reports 10 tracked benchmark scores — BullshitBench v2: 54%; Gray Swan IPI (k = 1): 5.4%; Gray Swan IPI (k = 10): 26%; Gray Swan IPI (k = 15): 30.4%; Frontier-Bench v0.1: 20.8%; Terminal-Bench 4.0: 21.52%; Terminal-Bench 2.1: 84.3%; BrowseComp: 87.5%; ARC-AGI-2: 83.9%; threejseval: 1438. Tracked scores may come from lab reports or independent benchmarks; source details accompany the benchmark data.

Is GPT-5.6 Terra open source?

No. GPT-5.6 Terra is a closed model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.

What came before and after GPT-5.6 Terra?

OpenAI's previous tracked release was GPT-5.6 Sol on Jun 26 2026. It was followed by GPT-5.6 Luna on Jun 26 2026.

GPT-5.6 Terra

Released Jun 26 2026

GPT-5.6 Terra is an AI model released by OpenAI on Friday, Jun 26 2026, the same day as GPT-5.6 Sol. Benchmark results (shown below) cover BullshitBench v2, Gray Swan IPI, Frontier-Bench v0.1, Terminal-Bench 4.0, Terminal-Bench 2.1, BrowseComp, and 2 more.

API pricing

Up to 272K input tokens

Input: $2.00
Cached input: $0.20
Cache write: $2.50
Output: $12.00

Over 272K input tokens

Input: $4.00
Cached input: $0.40
Cache write: $5.00
Output: $18.00

Reasoning or thinking is supported.

USD per 1M tokensModel mapping

Available from


OpenAI	—	flex	$1.00	$6.00	1M
OpenAI	—	—	$2.00	$12.00	1M
Azure	—	—	$2.00	$12.00	1M
Azure	eu	—	$2.20	$13.20	1M
Azure	us	—	$2.20	$13.20	1M
Amazon Bedrock	us-east-1	—	$2.20	$13.20	1M
OpenAI	—	fast	$4.00	$24.00	1M

USD per 1M tokens

Benchmarks

Terminal & CLI

Frontier-Bench v0.1

20.8%

#5 of 9

Terminal-Bench 4.0via Terminal-Bench

21.52%

#12 of 18

Terminal-Bench 2.1

84.3%

#11 of 30

Agentic & tool use

BrowseCompvia BenchLM

87.5%

#8 of 28

Reasoning & science

ARC-AGI-2via BenchLM

83.9%

#6 of 21

Robustness

BullshitBench v2

54%

#25 of 79

Gray Swan IPI

5.4%k = 1

26%k = 10

30.4%k = 15

k = 1

#8 of 13

k = 10

#8 of 13

k = 15

#8 of 13

Community preference

threejseval

1438

#11 of 18

Source: Terminal-Bench, retrieved 30 August 2026 · Source: BenchLM, retrieved 24 August 2026. Other sources are identified on the linked benchmark pages.

Compare GPT-5.6 Terra with

GPT-5.6 Terra

Suggested comparisons

GPT-5.6 TerravsGPT-6 Sol GPT-5.6 TerravsClaude Opus 5.5 GPT-5.6 TerravsGemini 3.8 Flash GPT-5.6 TerravsMuse Spark 1.3 GPT-5.6 TerravsGrok 4.7 GPT-5.6 TerravsDeepSeek-V4.1-Flash GPT-5.6 TerravsMistral Medium 3.5 GPT-5.6 TerravsKimi K3 GPT-5.6 TerravsGLM-5.3-Flash GPT-5.6 TerravsQwen3.8-Max-0902 GPT-5.6 TerravsNemotron 3.5 Lightning

Frequently asked questions

: GPT-5.6 Terra was released by OpenAI on Friday, Jun 26 2026.
: GPT-5.6 Terra was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.
: GPT-5.6 Terra costs $2.00 per million input tokens and $12.00 per million output tokens through the OpenAI API. Cached input is $0.20 per million tokens. Those are the rates for the “Up to 272K input tokens” tier; 1 other pricing tier is published for this model. Rates are pay-as-you-go API prices verified against OpenAI's published pricing on August 18, 2026.
: GPT-5.6 Terra reports 10 tracked benchmark scores — BullshitBench v2: 54%; Gray Swan IPI (k = 1): 5.4%; Gray Swan IPI (k = 10): 26%; Gray Swan IPI (k = 15): 30.4%; Frontier-Bench v0.1: 20.8%; Terminal-Bench 4.0: 21.52%; Terminal-Bench 2.1: 84.3%; BrowseComp: 87.5%; ARC-AGI-2: 83.9%; threejseval: 1438. Tracked scores may come from lab reports or independent benchmarks; source details accompany the benchmark data.
: No. GPT-5.6 Terra is a closed model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.
: OpenAI's previous tracked release was GPT-5.6 Sol on Jun 26 2026. It was followed by GPT-5.6 Luna on Jun 26 2026.