Reasoning Effort
* control thinking time/depth: "minimal" | "low" | "medium" (default) | "high".
* higher effort → more careful, slower; lower → faster, cheaper.
* minimal is new in GPT-5 for super-fast replies.
Verbosity
* control answer length/detail: "low" | "medium" (default) | "high".
* if your prompt says “write 5 paragraphs”, that explicit instruction wins over verbosity.
Open AI examples (click to open)
Verbosity=low
Why is the sky blue?
Because of Rayleigh scattering. Air molecules are much smaller than the wavelength of visible light, so
they scatter short wavelengths (blue/violet) far more than long ones (red). The scattered blue light comes
to your eyes from all directions, making the sky look blue. We don’t see violet as much because the Sun
emits less of it, our eyes are less sensitive to it, and some is absorbed in the upper atmosphere. At
sunrise and sunset, the longer path through air removes more blue, leaving the sky reddish.
Verbosity=medium
Why is the sky blue?
Because of Rayleigh scattering. Sunlight contains all colors, but air molecules scatter shorter
wavelengths (blue/violet) much more strongly than longer wavelengths (red). The scattering strength goes
roughly as 1/(wavelength)^4, so blue light gets redirected across the sky and into your eyes.
We don’t see a violet sky because:
The Sun emits slightly less violet than blue.
The upper atmosphere absorbs some violet/UV.
Human eyes are less sensitive to violet.
At sunrise and sunset, sunlight passes through more atmosphere, scattering out most of the blues along
the way and leaving the longer red/orange wavelengths to dominate.
Verbosity=high
Why is the sky blue?
The sky looks blue because sunlight gets scattered by the tiny molecules in Earth’s atmosphere. This
process is called Rayleigh scattering.
Key points:
Sunlight is made of many colors (wavelengths). Shorter wavelengths, like violet and blue, are scattered
much more strongly by air molecules than longer wavelengths like red. The scattering strength increases
sharply as wavelength gets shorter.
As sunlight passes through the atmosphere, the shorter-wavelength light (especially blue) is scattered
in all directions, so no matter where you look away from the Sun, you see that scattered blue light — the
“blue sky.”
Why not violet?
The Sun emits less violet than blue.
Our eyes are less sensitive to violet.
Some violet/UV is absorbed higher up by ozone.
Together, that makes the scattered light we perceive look mainly blue.
Why are sunsets red/orange?
Near sunrise and sunset, sunlight travels a much longer path through the atmosphere.
Much of the blue light gets scattered out of the direct path before it reaches your eyes, leaving the
remaining direct sunlight enriched in reds and oranges.
Other influences:
Haze, pollution, smoke, or dust have larger particles that scatter light less selectively (called Mie
scattering), making the sky look paler or whitish.
The blue sky is partially polarized due to the scattering geometry, which is why polarized sunglasses
can darken parts of it.
On worlds with different atmospheres and particle sizes (like Mars), skies can look butterscotch or
reddish for similar scattering reasons.
If Earth had no atmosphere, there would be nothing to scatter sunlight, and the sky would appear black
even in daytime, with the Sun as a bright disk.
Other Hyperparameters
n/a - check official documents - TODO
Code
from openai import OpenAI
client = OpenAI(
resp = client.responses.create(
model="gpt-5"
input="Why is the sky blue?",
reasoning={"effort": "minimal"},
text={"verbosity": "low"}
)
print(resp.output_text)Chart
Coding -- https://openai.com/index/introducing-gpt-5-for-developers/
Others graph -> check official documents
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