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GPT-5.6 Terra

Release Ruler for GPT-5.6 Terra: released Jul 9, 2026, $2 per 1M input tokens, proprietary. Each thin stem on the ruler is another model we track.

GPT-5.6 Terra is an OpenAI language model released Jul 9, 2026; OpenAI's newest language model in our dataset is GPT-6.1 Terra. Proprietary, API access only. OpenAI's GPT-5.6 mid-tier model, released Jul 9, 2026 to balance intelligence and cost. Verified against vendor sources on Oct 26, 2026.

Reported Last verified · All models · JSON · Markdown

  • ReleasedJul 9, 2026
  • Context window1.05M1,050,000 tokens
  • Max output128K128,000 tokens
  • LicenceProprietaryProprietary (API)
InTextImageOutText

Key facts

GPT-5.6 Terra: key facts with sources
FactValueSource
VendorOpenAIn/a
ReleasedJul 9, 2026source
Statusgenerally availablen/a
API idgpt-5.6-terrasource
Context window1,050,000 tokens (1.05M)source
Max output128,000 tokenssource
Inputtext, imagesource
Outputtextsource
LicenceProprietary (API)source
Pricing$2 in / $12 out per 1M tokenssource

Where GPT-5.6 Terra sits in our data

How GPT-5.6 Terra differs from GPT-5.6 Luna

Read from the recorded facts of the two models, not from a head-to-head test. We have not run either.

  • Listed price is $2 in and $12 out, against $0.2 in and $1.2 out for GPT-5.6 Luna (per 1M tokens).
  • Both list a 1.05M-token context window.
  • Both accept text, image as input.
  • Both were released on Jul 9, 2026.
  • Facts for the other model: GPT-5.6 Luna.

What we tested

Nothing yet. We have not run GPT-5.6 Terra ourselves, so every fact on this page is Reported from the sources below. When we do test it, the scope will be stated here and in our test logs. See methodology.

Sources

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