infro

The official Python client for the INFRO API — one endpoint for text, image, video and audio models.

pip install infro

from infro import Infro

infro = Infro()  # reads INFRO_API_KEY

image = infro.images.generate(
    model="bfl/flux-2-pro",
    prompt="a lighthouse in fog, 35mm",
)
print(image["data"][0]["url"])
print(f"cost: ${image['usage']['cost']}")

Why this and not the OpenAI SDK

For text, either works — INFRO serves an OpenAI-compatible /v1/chat/completions and any client that lets you override the base URL will talk to it. What the OpenAI SDK cannot express is the rest of the platform:

• Images, video and audio, with usage.cost on every response.
• Video as an async job, with a signed webhook when the render lands.
• INFRO's request extensions — routing, fallbacks, logging, metadata — as ordinary keyword arguments rather than an untyped extra_body dictionary.
• The error taxonomy as exceptions, so "should I retry this?" is except RateLimitError and not a substring match on a message.

Configuration

infro = Infro(
    api_key="sk_infro_...",          # or INFRO_API_KEY in the environment
    base_url="https://api.infro.io/v1",
    timeout=600.0,                    # seconds, per attempt
    max_retries=2,                    # attempts *after* the first
)

The key falls back to INFRO_API_KEY because a key in source is a key in version control.

Text

Shaped exactly like the OpenAI SDK, so moving a codebase across is a rename:

completion = infro.chat.completions.create(
    model="anthropic/claude-sonnet-5",
    messages=[{"role": "user", "content": "Hello"}],
)
print(completion["choices"][0]["message"]["content"])
print(completion["model"])   # the model that *served* — matters with fallbacks
print(completion["route"])   # "primary" or "standby_a" — a position, never a vendor

Streaming yields chunks and ends at [DONE]:

for chunk in infro.chat.completions.create(
    model="anthropic/claude-sonnet-5",
    messages=[{"role": "user", "content": "Write a haiku about fog."}],
    stream=True,
):
    delta = chunk["choices"][0]["delta"].get("content")
    if delta:
        print(delta, end="", flush=True)

A stream that ends without [DONE] raises rather than returning quietly: the gateway closes that way when a request fails after the first byte, so silence would hand you a truncated answer that looks complete.

Routing, fallbacks and cost control

completion = infro.chat.completions.create(
    model="openai/gpt-5.6-terra",
    messages=[{"role": "user", "content": "Hello"}],
    routing={"policy": "fastest", "regions": ["us", "eu"]},
    fallbacks=["deepseek/deepseek-v4-flash"],
    metadata={"user": "u_42", "feature": "summariser"},
    logging=False,   # this request's content is never stored
)

metadata is echoed on the request record and exported as OpenTelemetry span attributes, so per-feature cost attribution needs no extra instrumentation.

Video

Renders take minutes, so they are jobs. A webhook is the production path:

job = infro.videos.create(
    model="kuaishou/kling-o3",
    prompt="slow push-in on a lighthouse in fog",
    duration_seconds=6,
    webhook={"url": "https://api.example.com/hooks/infro"},
)
print(job["id"], job["status"])

In a script or a test, where there is nowhere for a webhook to land, poll:

finished = infro.jobs.wait_for(job["id"])
print(finished["output"]["url"])

wait_for raises on a failed render rather than returning it, because a caller who awaited "the finished video" will use whatever comes back as one.

Audio

audio = infro.audio.speech(
    model="elevenlabs/eleven-v3",
    input="The lighthouse keeper watched the fog roll in.",
    voice="rachel",
)
open("out.mp3", "wb").write(audio)

transcript = infro.audio.transcribe(
    model="openai/whisper-large-v3",
    file="https://example.com/recording.mp3",
)
print(transcript["text"])

Errors

from infro import BudgetExceededError, RateLimitError, UpstreamError

try:
    infro.chat.completions.create(model="...", messages=[...])
except BudgetExceededError as error:
    ...          # top up; retrying will not help
except RateLimitError as error:
    ...          # already retried for you; error.retry_after is the server's own hint
except UpstreamError as error:
    print(error.request_id)   # the first thing support will ask for

Every exception carries status, type, code, request_id and retryable. retryable is keyed on the HTTP status, not the type, because the status is what the docs promise and what a proxy preserves.

Retries

Only the four statuses the docs name as retryable — 408, 429, 502, 503 — and always with an Idempotency-Key, so a retry of a request the gateway already accepted returns the first response instead of doing the work twice. Retry-After wins over the computed backoff; jitter stops a fleet that failed together from retrying together.

Streams are never retried: past the first byte the caller has already seen part of an answer.

Async

Every method has an awaitable twin with the same signature:

from infro import AsyncInfro

async with AsyncInfro() as infro:
    completion = await infro.chat.completions.create(
        model="anthropic/claude-sonnet-5",
        messages=[{"role": "user", "content": "Hello"}],
    )

Anything this client does not model

The gateway grows faster than a client library, so there is an escape hatch that keeps the authentication and the retries:

data = infro.request("GET", "/usage?from=2026-08-01")

Documentation

https://infro.io/docs — the API reference, the error table, and the routing, fallback and privacy semantics this client is a thin shell over.