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A smooth rounded river stone of pale sandstone with a fine silver vein running through it on a dark background, abstract hero artwork for GPT 5.6 Terra

OpenAI

GPT 5.6 Terra

The balanced model in OpenAI's GPT-5.6 series, roughly its mini tier, for everyday work.

Chat with GPT 5.6 Terra in Super AgentView pricing

What is GPT 5.6 Terra?

GPT 5.6 Terra is the balanced model in OpenAI's GPT-5.6 series, between the flagship Sol and the fast Luna, and generally available since July 9, 2026.

OpenAI describes it as competitive with GPT-5.5 at lower cost and says it roughly fills the mini tier of earlier GPT-5 families. It takes text and images within a 1.05M-token context, and reasoning runs from off to max. In Super Agent it is listed under All models.

Provider
OpenAI
Context window
1.05M tokens
Input
Text, Image
Reasoning
Off to max
Max output
128K tokens
Knowledge cutoff
Feb 16, 2026
Released
Jul 9, 2026

How GPT 5.6 Terra performs

Published by OpenAI

Results OpenAI reported for GPT 5.6 Terra. Each lab runs its own setup, so compare these with other models only inside the same table.

Benchmark results OpenAI published for GPT 5.6 Terra
BenchmarkScoreSetting
Agents' Last Exam50.4%
SWE-Bench Pro63.4%
DeepSWE v1.169.6%
Terminal-Bench 2.187.4%
OSWorld 2.050.2%
BrowseComp87.5%
GPQA Diamond92.9%
MMMU Pro80.7%no tools
Toolathlon53.1%
OpenAI MRCR v2, 8 needles72.5%512K to 1M tokens

Source: openai.com

What you can do with GPT 5.6 Terra

  • Balanced middle tier of the GPT-5.6 series

  • Competitive with GPT-5.5 at lower cost, according to OpenAI

  • Reasoning can be off for quick turns or raised as far as max

  • Accepts images alongside text, up to 1.05M tokens

How to prompt GPT 5.6 Terra

  • Use medium effort as a starting point for everyday tasks.
  • Move to GPT 5.6 Sol if a task needs deeper reasoning.
  • Turn reasoning off for quick rewrites and lists.

Where GPT 5.6 Terra fits best

  • Everyday creative chat

  • Routine planning and writing

  • Agent tasks of moderate difficulty

  • A middle ground between Sol and Luna

How GPT 5.6 Terra compares

GPT 5.6 Terra compared with other chat models on Flashloop
ModelLMArena textLMArena codingContext windowReasoning
GPT 5.6 Terra1467#491518#421.05M tokensOff to max
Grok 4.51466#521514#48500K tokensLow, medium, high
Claude Sonnet 51462#581520#371M tokensOff to max
Kimi K2.61461#591516#44256K tokensOn or off
GPT-6 Sol1459#621519#381.05M tokensOff to max

Good to know before you start

  • Below GPT 5.6 Sol on the hardest tasks
  • An earlier generation than OpenAI's GPT-6 models
  • Its output is text; the agent calls Flashloop's generation models when you want images or video

Start chatting with GPT 5.6 Terra

Chat with GPT 5.6 Terra in Super Agent

  1. Select GPT 5.6 Terra

    Open Super Agent on Flashloop and choose GPT 5.6 Terra in the model picker.

  2. Enter your prompt

    Ask for what you need: an answer, a plan, or the images and videos you want the agent to make.

  3. Send and keep going

    Send the message. GPT 5.6 Terra answers in Super Agent and runs any generations you asked for.

Questions about GPT 5.6 Terra

Where does GPT 5.6 Terra sit in the GPT-5.6 series?

In the middle, between the flagship GPT 5.6 Sol and the fast GPT 5.6 Luna.

What is GPT 5.6 Terra best for?

Everyday work where you want a balance of capability and cost. OpenAI compares it with GPT-5.5 and says it costs less to run.

Where do I find GPT 5.6 Terra in Super Agent?

Under All models in the model picker. It starts at low reasoning effort.

Does GPT 5.6 Terra support reasoning off?

Yes. It supports off, low, medium, high, extra high and max.

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