Solwyn Python SDK

Budget enforcement, circuit breaking, and usage tracking for OpenAI, Anthropic, and Google LLM clients.

Solwyn wraps your existing LLM client. Calls go directly to the provider — the SDK only reports metadata (token counts, latency, model name) to the Solwyn API. Prompts and responses never leave your application.

Installation

pip install solwyn

For improved token estimation with OpenAI models:

pip install solwyn[openai]

Quick Start

from openai import OpenAI
from solwyn import Solwyn

client = Solwyn(
    OpenAI(),
    api_key="sk_solwyn_...",
    project_id="proj_abc12345",
)

response = client.chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Hello!"}],
)

client.close()

Or use as a context manager:

with Solwyn(OpenAI(), api_key="sk_solwyn_...", project_id="proj_abc12345") as client:
    response = client.chat.completions.create(
        model="gpt-4o",
        messages=[{"role": "user", "content": "Hello!"}],
    )

Providers

OpenAI

from openai import OpenAI
from solwyn import Solwyn

client = Solwyn(OpenAI(), api_key="sk_solwyn_...", project_id="proj_abc12345")
response = client.chat.completions.create(model="gpt-4o", messages=[...])

Anthropic

from anthropic import Anthropic
from solwyn import Solwyn

client = Solwyn(Anthropic(), api_key="sk_solwyn_...", project_id="proj_abc12345")
response = client.messages.create(model="claude-sonnet-4-20250514", max_tokens=1024, messages=[...])

Google Gemini

from google import genai
from solwyn import Solwyn

client = Solwyn(genai.Client(api_key="..."), api_key="sk_solwyn_...", project_id="proj_abc12345")
response = client.models.generate_content(model="gemini-2.0-flash", contents="Hello!")

Async

from openai import AsyncOpenAI
from solwyn import AsyncSolwyn

async with AsyncSolwyn(
    AsyncOpenAI(),
    api_key="sk_solwyn_...",
    project_id="proj_abc12345",
) as client:
    response = await client.chat.completions.create(
        model="gpt-4o",
        messages=[{"role": "user", "content": "Hello!"}],
    )

Streaming

Pass stream=True as you normally would. Solwyn wraps the stream transparently and reports usage when it completes:

stream = client.chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Hello!"}],
    stream=True,
)

for chunk in stream:
    print(chunk.choices[0].delta.content or "", end="")

Budget Enforcement

Set budget_mode to control spending:

client = Solwyn(
    OpenAI(),
    api_key="sk_solwyn_...",
    project_id="proj_abc12345",
    budget_mode="hard_deny",
)

Mode	Behavior
alert_only	Log a warning when budget is exceeded (default)
hard_deny	Raise BudgetExceededError and block the call

from solwyn import BudgetExceededError

try:
    response = client.chat.completions.create(model="gpt-4o", messages=[...])
except BudgetExceededError as e:
    print(f"Budget limit: ${e.budget_limit}, usage: ${e.current_usage}")

Configuration

Parameter	Env Var	Default	Description
api_key	SOLWYN_API_KEY	required	Solwyn API key
project_id	SOLWYN_PROJECT_ID	required	Project identifier
api_url	SOLWYN_API_URL	https://api.solwyn.ai	Solwyn API endpoint
fail_open	SOLWYN_FAIL_OPEN	True	Allow LLM calls when Solwyn API is unreachable
budget_mode	SOLWYN_BUDGET_MODE	alert_only	Budget enforcement mode
fallback_provider	SOLWYN_FALLBACK_PROVIDER	None	Failover provider when primary circuit breaks

Use env vars to avoid passing credentials in code:

export SOLWYN_API_KEY="sk_solwyn_..."
export SOLWYN_PROJECT_ID="proj_abc12345"

client = Solwyn(OpenAI())  # picks up from environment

Error Handling

All SDK errors inherit from SolwynError:

Exception	Raised when
BudgetExceededError	Budget exceeded in hard_deny mode
ProviderUnavailableError	Circuit breaker is open and no fallback exists
ConfigurationError	Invalid API key or project ID format

Provider errors (e.g., openai.RateLimitError) pass through unmodified.

Data Transparency

The SDK sends a MetadataEvent after each LLM call. This is everything it transmits:

Field	Type	Description
project_id	str	Project identifier
model	str	Model name (e.g., gpt-4o)
provider	str	openai, anthropic, or google
input_tokens	int	Input token count
output_tokens	int	Output token count
token_details	object	Breakdown: cached, reasoning, audio tokens
latency_ms	float	Call duration in milliseconds
status	str	success, error, or budget_denied
is_failover	bool	Whether a fallback provider was used
sdk_instance_id	str	Per-process UUID for deduplication
timestamp	datetime	When the call completed (UTC)

The SDK never captures, logs, or transmits prompts or responses. This is enforced by structural tests and the privacy module.

Requirements

Python 3.11+

Contributing

make install          # install in dev mode
make install-hooks    # install pre-commit hook
make check            # lint + format + typecheck
make test             # run unit tests

Links

• Documentation
• Solwyn Cloud — Dashboard, alerts, and analytics
• MPI.sh — LLM API pricing comparison

License

Apache 2.0 — see LICENSE for details.