Heroku

Using Heroku Inference API with Upsonic

Overview

Heroku provides an OpenAI-compatible inference API. The default base URL is https://us.inference.heroku.com (with /v1 appended). You can override it with HEROKU_INFERENCE_URL or pass base_url to HerokuProvider.

Model Class: HerokuModel

Authentication

export HEROKU_INFERENCE_KEY="..."
# Optional: custom base URL (without /v1)
export HEROKU_INFERENCE_URL="https://us.inference.heroku.com"

Examples

from upsonic import Agent, Task
from upsonic.models.heroku import HerokuModel

model = HerokuModel(model_name="claude-sonnet-4-6")
agent = Agent(model=model)

task = Task("Hello, how are you?")
result = agent.do(task)
print(result)

Model Settings

You can set model parameters in two ways: on the model or on the Agent.

On the model:

from upsonic import Agent, Task
from upsonic.models.heroku import HerokuModel, HerokuModelSettings

model = HerokuModel(
    model_name="claude-sonnet-4-6",
    settings=HerokuModelSettings(max_tokens=1024, temperature=0.7)
)
agent = Agent(model=model)

On the Agent:

from upsonic import Agent, Task
from upsonic.models.heroku import HerokuModelSettings

agent = Agent(
    model="heroku/claude-sonnet-4-6",
    settings=HerokuModelSettings(max_tokens=1024, temperature=0.7)
)

Parameters

Parameter	Type	Description	Default	Source
max_tokens	int	Maximum tokens to generate	Model default	Base
temperature	float	Sampling temperature (0.0-2.0)	1.0	Base
top_p	float	Nucleus sampling	1.0	Base
seed	int	Random seed	None	Base
stop_sequences	list[str]	Stop sequences	None	Base
presence_penalty	float	Token presence penalty	0.0	Base
frequency_penalty	float	Token frequency penalty	0.0	Base
parallel_tool_calls	bool	Allow parallel tools	True	Base
timeout	float	Request timeout (seconds)	600	Base