babyapi 0.2.0

BabyAPI client.

BabyAPI (Python SDK)

A tiny Python client for BabyAPI — an OpenAI-compatible API for hosted open-weight models.

Minimal surface area. Calm defaults. You bring an API key — we handle the GPUs.

Endpoints

• OpenAI-compatible:
  • POST /v1/chat/completions
  • POST /v1/completions
  • POST /v1/embeddings
  • POST /v1/rerank
• BabyAPI convenience:
  • POST /infer (simple text-in, text-out)

---

Install

pip install babyapi

---

Quick start (the easy path): client.baby.infer(...)

If you just want text in → text out, start here.

import os
from babyapi import BabyAPI

client = BabyAPI(
    api_key=os.getenv("BABYAPI_API_KEY"),
    default_model="mistral",  # so you can call baby.infer("...") without specifying model
)

out = client.baby.infer(
    {
        "prompt": "Write a 1-line release note title for BabyAPI.",
        "maxTokens": 40,
        "temperature": 0.5,
    }
)

print(out["output"])
print(out.get("usage"))

You can also pass a raw string:

out = client.baby.infer("Explain BabyAPI in one sentence.")
print(out["output"])

Supported options (aliases accepted)

You can pass options directly or inside "options": {...}:

• max_tokens / maxTokens
• temperature
• top_p / topP
• top_k / topK
• stop
• presence_penalty / presencePenalty
• frequency_penalty / frequencyPenalty

Example with aliases + nested options:

out = client.baby.infer(
    {
        "model": "mistral",
        "prompt": "Give 3 calm API principles.",
        "options": {"topP": 0.9, "max_tokens": 80},
    }
)
print(out["output"])

---

One method for both OpenAI endpoints: client.infer(...)

If you want “do the right thing” with OpenAI-style payloads:

• If you pass messages → routes to chat completions
• If you pass prompt → routes to completions

chat_res = client.infer(
    {
        "model": "mistral",
        "messages": [{"role": "user", "content": "One-line slogan for BabyAPI?"}],
    }
)
print(chat_res["choices"][0]["message"]["content"])

comp_res = client.infer(
    model="mistral",
    prompt="Give 3 product names for a tiny LLM SDK.",
    max_tokens=60,
)
print(comp_res["choices"][0]["text"])

---

OpenAI-compatible: Chat Completions

res = client.chat.completions.create(
    model="mixtral",
    messages=[
        {"role": "system", "content": "You are concise."},
        {"role": "user", "content": "Give me 3 tagline ideas for a tiny LLM API."},
    ],
    temperature=0.7,
)

print(res["choices"][0]["message"]["content"])

---

OpenAI-compatible: Completions

res = client.completions.create(
    model="mistral",
    prompt="Write a friendly release note opener for BabyAPI.",
    max_tokens=120,
    temperature=0.7,
)

print(res["choices"][0]["text"])

---

OpenAI-compatible: Embeddings

res = client.embeddings.create(
    model="qwen3-embedding",
    input="BabyAPI makes LLMs easy.",
)

print(res["data"][0]["embedding"][:5])  # first 5 dimensions
print(res["usage"])

You can also embed multiple texts at once:

res = client.embeddings.create(
    model="qwen3-embedding",
    input=[
        "First document to embed.",
        "Second document to embed.",
    ],
)

for item in res["data"]:
    print(f"Index {item['index']}: {len(item['embedding'])} dimensions")

Supported parameters

Parameter	Type	Description
model	str	Required. The embedding model to use.
input	str | list[str]	Required. Text(s) to embed.
encoding_format	str	Optional. "float" (default) or "base64".
dimensions	int	Optional. Truncate embeddings to this many dimensions.
truncate_prompt_tokens	int	Optional. Max tokens to keep (vLLM-specific).

---

Reranking

res = client.rerank.create(
    model="qwen3-reranker",
    query="What is BabyAPI?",
    documents=[
        "BabyAPI is a tiny hosted LLM API.",
        "The weather is nice today.",
        "BabyAPI supports OpenAI-compatible endpoints.",
    ],
)

for result in res["results"]:
    print(f"Index {result['index']}: relevance_score={result['relevance_score']:.4f}")

Supported parameters

Parameter	Type	Description
model	str	Required. The reranker model to use.
query	str	Required. The query to rank documents against.
documents	list[str]	Required. Documents to rerank.
top_n	int	Optional. Return only the top N results.
return_documents	bool	Optional. Include document text in results.
truncate_prompt_tokens	int	Optional. Max tokens to keep (vLLM-specific).

---

Streaming (SSE)

.stream(...) yields SSEEvent objects:

• event.done → True when the stream is finished ([DONE])
• event.data → parsed JSON when possible (otherwise None)
• event.raw → raw data: payload string

Streaming: chat

import os
from babyapi import BabyAPI

client = BabyAPI(api_key=os.getenv("BABYAPI_API_KEY"))

for event in client.chat.completions.stream(
    model="mistral",
    messages=[{"role": "user", "content": "Write a short poem about servers."}],
):
    if event.done:
        break

    delta = (event.data or {}).get("choices", [{}])[0].get("delta", {})
    chunk = delta.get("content")
    if chunk:
        print(chunk, end="", flush=True)

print()

Streaming: completions

for event in client.completions.stream(
    model="mistral",
    prompt="List 5 calm API-building tips.",
):
    if event.done:
        break

    text = (event.data or {}).get("choices", [{}])[0].get("text")
    if text:
        print(text, end="", flush=True)

print()

Note: like many SDKs, streaming requests are not retried. If you want retries for streams, wrap your call at the application level.

---

Multimodal (vision) examples (OpenAI-style)

If the model you select supports vision, you can send images using OpenAI-style message content.

Vision: non-streaming

res = client.chat.completions.create(
    model="pixtral",  # or another vision-capable model you expose
    messages=[
        {
            "role": "user",
            "content": [
                {"type": "text", "text": "Describe the image in 2 sentences. Then list 3 objects you see."},
                {
                    "type": "image_url",
                    "image_url": {"url": "https://api.babyapi.org/images/banner.png"},
                },
            ],
        }
    ],
)

print(res["choices"][0]["message"]["content"])

Vision: streaming

for event in client.chat.completions.stream(
    model="pixtral",
    messages=[
        {
            "role": "user",
            "content": [
                {"type": "text", "text": "What is this image trying to communicate?"},
                {"type": "image_url", "image_url": {"url": "https://api.babyapi.org/images/banner.png"}},
            ],
        }
    ],
):
    if event.done:
        break

    delta = (event.data or {}).get("choices", [{}])[0].get("delta", {})
    chunk = delta.get("content")
    if chunk:
        print(chunk, end="", flush=True)

print()

Image support depends on the model you choose. If the model is text-only, the API may reject image inputs.

---

Configuration

import os
from babyapi import BabyAPI

client = BabyAPI(
    api_key=os.getenv("BABYAPI_API_KEY"),          # required (or BABY_API_KEY)
    base_url=os.getenv("BABYAPI_BASE_URL"),        # optional (default: https://api.babyapi.org)
    timeout_s=60.0,                                # JSON requests only
    max_retries=2,                                 # retry transient failures
    retry_base_delay_s=0.25,                       # exponential backoff base
    default_model="mistral",                       # used by client.baby.infer when model omitted
    default_headers={"x-app": "my-sideproject"},   # extra headers for every request
)

Environment variables supported:

• BABYAPI_API_KEY (or BABY_API_KEY)
• BABYAPI_BASE_URL
• BABYAPI_DEFAULT_MODEL

---

Per-call overrides (RequestOptions)

Every .create(...) / .stream(...) accepts request_options.

import os
from babyapi import BabyAPI, RequestOptions

client = BabyAPI(api_key=os.getenv("BABYAPI_API_KEY"))

res = client.chat.completions.create(
    request_options=RequestOptions(
        timeout_s=30.0,
        max_retries=0,
        headers={"x-trace": "abc123"},
    ),
    model="mistral",
    messages=[{"role": "user", "content": "Hello."}],
)

You can also pass a plain dict:

res = client.chat.completions.create(
    request_options={"timeout_s": 10.0, "headers": {"x-app": "demo"}},
    model="mistral",
    messages=[{"role": "user", "content": "Hi again."}],
)

---

Timeouts & cancellation

• JSON requests use timeout_s (default: 60s).
• Streaming requests default to no timeout (infinite), matching common SSE usage.
  • If you want a stream timeout, pass request_options={"timeout_s": 30.0}.
• To stop a stream early, break your loop.

---

Errors

SDK errors raise BabyAPIError when possible.

import os
from babyapi import BabyAPI, BabyAPIError

client = BabyAPI(api_key=os.getenv("BABYAPI_API_KEY"))

try:
    client.chat.completions.create(model="mistral", messages=[])
except BabyAPIError as err:
    print(
        {
            "message": err.message,
            "status": err.status,
            "code": err.code,
            "type": err.type,
            "request_id": err.request_id,
        }
    )

---

Context manager / cleanup

The client maintains an httpx.Client. Use it as a context manager to ensure clean shutdown:

import os
from babyapi import BabyAPI

with BabyAPI(api_key=os.getenv("BABYAPI_API_KEY")) as client:
    res = client.completions.create(model="mistral", prompt="Ping")
    print(res["choices"][0]["text"])

---

License

MIT.