coffee-with-llm 0.5.3

A model-agnostic Python library with a unified API for multiple LLM providers

coffee_with_llm

A model-agnostic Python library providing a unified API for OpenAI, Anthropic Claude, and Google Gemini.

Features

• Model-agnostic: Picks the provider from the model id, or from an explicit provider/model prefix (see below)
• Unified API: Same interface for OpenAI, Anthropic Claude, and Google Gemini
• Tool Calling: Full support for OpenAI's tool calling with multi-step execution
• Structured Outputs: Support for JSON schema and response formatting
• Caching: Google explicit context cache; Anthropic automatic prompt cache; OpenAI passes through cached_tokens when present
• Citations: Automatic citation injection for Google Gemini responses
• Extended thinking: Single reasoning_effort knob ("low" | "medium" | "high") translates to OpenAI reasoning.effort, Anthropic adaptive output_config.effort (4.6+) or legacy thinking.budget_tokens, and Google thinking_config

Installation

pip install coffee_with_llm

Quick Start

import asyncio
from coffee_with_llm import AskLLM

async def main():
    # Initialize with any model (model is required)
    llm = AskLLM(model="gpt-5.4")
    
    # Simple question
    response = await llm.ask(
        prompt="What is Python?",
        system_instruct="You are a helpful assistant."
    )
    print(response.text)
    
    # Use Google Gemini
    llm_gemini = AskLLM(model="gemini-3.1-pro-preview")
    response = await llm_gemini.ask(
        prompt="Explain quantum computing",
        system_instruct="You are a physics expert."
    )
    print(response.text)

    # Google Gemma (or any Google API model id): prefix selects Google; only the part
    # after "/" is sent to the API
    llm_gemma = AskLLM(model="google/gemma-2-9b-it")
    response = await llm_gemma.ask(prompt="Say hi in five words or fewer.")
    print(response.text)

asyncio.run(main())

Provider prefix (provider/model)

You can force the provider and pass the exact API model id with a single slash:

Prefix	Provider	Example
google/	Google	google/gemma-2-9b-it
gemini/	Google	gemini/gemini-2.5-flash
openai/	OpenAI	openai/gpt-4o-mini
anthropic/	Anthropic	anthropic/claude-sonnet-4-6
claude/	Anthropic	claude/claude-sonnet-4-6

Only the segment after the first / is sent to the provider API (e.g. google/gemma-2-9b-it → API model gemma-2-9b-it). If the prefix is missing or unknown, the whole string is used for both routing and the API (legacy behavior: ids like gpt-4o-mini, claude-…, gemini-…, google-… still auto-route).

An empty id after the prefix (e.g. google/) is rejected with ValidationError.

Configuration

Set environment variables for API keys:

export OPENAI_API_KEY="your-openai-key"
export ANTHROPIC_API_KEY="your-anthropic-key"
export GOOGLE_API_KEY="your-google-key"

Usage Examples

Basic Usage

from coffee_with_llm import AskLLM

# Model parameter is required
llm = AskLLM(model="gpt-5.4")
response = await llm.ask(prompt="Hello, world!")

With System Instructions

response = await llm.ask(
    prompt="Write a haiku about coding",
    system_instruct="You are a creative poet."
)

Structured Outputs (JSON Schema)

response = await llm.ask(
    prompt="Extract key information from: 'John Doe, age 30, works at Acme Corp'",
    response_format={
        "type": "json_schema",
        "json_schema": {
            "name": "person_info",
            "schema": {
                "type": "object",
                "properties": {
                    "name": {"type": "string"},
                    "age": {"type": "number"},
                    "company": {"type": "string"}
                }
            }
        }
    }
)

Tool Calling (OpenAI, Anthropic, Google)

def get_weather(location: str) -> dict:
    # Your tool implementation
    return {"temperature": 72, "condition": "sunny"}

tools = [
    {
        "type": "function",
        "function": {
            "name": "get_weather",
            "description": "Get weather for a location",
            "parameters": {
                "type": "object",
                "properties": {
                    "location": {"type": "string"}
                }
            }
        }
    }
]

async def execute_tool(name: str, args: dict) -> dict:
    if name == "get_weather":
        result = get_weather(args.get("location", ""))
        return {"ok": True, "result": result}
    return {"ok": False, "error": "Unknown tool"}

response = await llm.ask(
    prompt="What's the weather in San Francisco?",
    tools_schema=tools,
    execute_tool_cb=execute_tool
)

Extended Thinking (provider-agnostic)

reasoning_effort is a single string — "low", "medium", or "high" — that each provider translates to its native extended-thinking config. Pass None (or omit) to disable. Unknown values are ignored with a warning.

Effort	Anthropic (4.6+)	Anthropic (legacy) / Google
low	output_config.effort	1,024 token budget
medium	(adaptive thinking)	4,096 token budget
high		16,384 token budget

# Same call works on OpenAI, Anthropic, or Google
llm = AskLLM(model="anthropic/claude-sonnet-4-6")
response = await llm.ask(
    prompt="Solve this math problem: 2x + 5 = 15",
    reasoning_effort="high",
)

Provider-specific notes:

• OpenAI — passed through as reasoning.effort.
• Anthropic — on Claude Opus/Sonnet 4.6+, Gen 5, and Mythos, sets thinking={"type": "adaptive"} and output_config={"effort": ...} when reasoning_effort is set. On Sonnet 5 with no effort, explicitly disables thinking (API default is on). On Fable/Mythos 5 with no effort, uses adaptive at low effort (thinking cannot be disabled). On older models, sets thinking={"type": "enabled", "budget_tokens": N} (legacy); then temperature is forced to 1, top_p / top_k are dropped, and max_tokens is widened to leave ~1024 tokens for the visible answer. Short model aliases such as sonnet-5 normalize to claude-sonnet-5. Sampling params are omitted on Opus 4.7+, Sonnet 5, and Fable/Mythos 5 (API returns 400 otherwise). With anthropic_prompt_cache=True (default), adds top-level cache_control={"type": "ephemeral"} for automatic multi-turn caching; TokenUsage.cached_tokens reflects cache_read_input_tokens; cache_creation_tokens reflects cache writes; both are included in cost_usd.
• Google (Gemini 2.5+ / 3.x) — sets thinking_config with include_thoughts=False so only the final answer streams to the caller.

Streaming

from coffee_with_llm import StreamTextDelta

llm = AskLLM(model="gpt-5.4")
result = await llm.ask(prompt="Explain recursion in programming.", stream=True)
async for chunk in result:
    if isinstance(chunk, StreamTextDelta):
        print(chunk.text, end="", flush=True)
print(f"\nUsage: {result.usage.input_tokens} in, {result.usage.output_tokens} out")
print(f"Prompt tokens (all buckets): {result.usage.prompt_tokens}")
print(f"Billable tokens: {result.usage.billable_tokens}")
print(result.usage.to_dict())

Events: Iteration yields StreamTextDelta, StreamToolCallStart, StreamToolArgumentsDelta, StreamToolCallEnd, and StreamStepBoundary (between tool rounds), then completes. Bare str from older mocks is accepted and normalized to StreamTextDelta.

Tools and schema: stream=True works with tools_schema and response_format when the provider supports them; you must pass execute_tool_cb whenever tools_schema is set.

Gemini: Streaming with custom tools uses function calling only (no Google Search grounding in the same streaming request).

Usage and cost: result.usage (including cost_usd) is set when the stream finishes normally. If you stop early (break), call await result.aclose() so usage can be filled from the best-effort StreamUsageSink when the provider reported partial usage.

Understanding token usage

TokenUsage exposes provider-native buckets plus computed totals:

Field	Meaning
input_tokens	Uncached input billed at the full input rate
cached_tokens	Cache reads (discounted on Anthropic/OpenAI)
cache_creation_tokens	Cache writes (Anthropic; billed at 125% of input)
output_tokens	Generated output
total_tokens	Legacy: input_tokens + output_tokens only
prompt_tokens	All prompt-side tokens (input + cache read + cache write)
billable_tokens	prompt_tokens + output_tokens
cost_usd	Estimated USD (includes cache buckets when priced)

On Anthropic with prompt caching enabled (default), the first turn of a long system prompt often looks like input_tokens=2 with most prompt tokens in cache_creation_tokens — not a metering bug. Use usage.to_dict() for logging and dashboards.

payload = result.usage.to_dict()
# {"input_tokens": 2, "output_tokens": 8158, "cache_creation_tokens": 40000,
#  "prompt_tokens": 40002, "billable_tokens": 48160, "cost_usd": 0.28, ...}

Rate limits trigger retry before the first chunk.

Supported Models

OpenAI

• gpt-5.4, gpt-5.4-pro (flagship, reasoning)
• gpt-5.3-instant, gpt-5-mini, gpt-5-nano (fast, cost-effective)
• gpt-4o, gpt-4o-mini
• Any OpenAI model name

Anthropic Claude

• claude-sonnet-5, claude-opus-4-8, claude-sonnet-4-6 (latest)
• Short aliases after provider prefix: anthropic/sonnet-5, anthropic/fable-5
• claude-haiku, claude-3-5-sonnet
• Any Claude model name (claude-* prefix)

Google (Gemini, Gemma, …)

• gemini-3.1-pro-preview, gemini-3.1-flash (latest)
• gemini-2.5-pro, gemini-2.5-flash
• Any Gemini id the API accepts (gemini-… or google-… still auto-routes to Google)
• Gemma and other non-gemini Google ids: use the prefix form, e.g. google/gemma-2-9b-it, so routing hits Google and the API receives gemma-2-9b-it

API Reference

AskLLM

__init__(*, model, config=None, ...)

Initialize the LLM client.

Parameters:

• model (str): Model name (required). Optional provider/model form (see Provider prefix); otherwise provider is inferred from the id (gpt-…, claude-…, gemini-…, google-…, etc.).
• config (Config, optional): Config instance. If None, uses Config.from_env() for API keys
• min_delay_between_calls (float, optional): Min delay between API calls in seconds (default: 1.0)
• max_retries (int, optional): Max retries for rate limit errors (default: 3)
• request_timeout (float, optional): Request timeout in seconds (default: 60)
• google_explicit_cache (bool, optional): Enable Google context caching (default: True)
• anthropic_prompt_cache (bool, optional): Enable Anthropic automatic prompt caching (default: True)
• google_inline_citations (bool, optional): Inject [cite: url] markers for Gemini grounding (default: True)
• google_attach_search_tool (bool, optional): When using Gemini with no custom tools, attach the Google Search tool (default: True). Ignored for non-Google models.

ask(...)

Generate a response from the LLM.

Parameters:

• prompt (str): User prompt/question
• system_instruct (str, optional): System instruction
• messages (list, optional): Conversation history
• max_tokens (int, optional): Maximum tokens to generate
• temperature (float, optional): Sampling temperature (0-2)
• top_p (float, optional): Nucleus sampling parameter
• presence_penalty (float, optional): Presence penalty (OpenAI only)
• reasoning_effort (str, optional): Extended-thinking effort, "low" | "medium" | "high". Provider-agnostic — see Extended Thinking.
• tools_schema (list, optional): Tool/function calling schema (OpenAI, Anthropic, Google)
• response_format (dict, optional): Response format specification
• execute_tool_cb (callable, optional): Tool execution callback (OpenAI, Anthropic, Google)
• tool_error_callback (callable, optional): Callback when tool returns ok=False
• max_steps (int, optional): Maximum tool-calling steps (default: 24)
• max_effective_tool_steps (int, optional): Maximum effective tool steps (default: 12)
• force_tool_use (bool, optional): Force at least one tool call when tools provided (default: False)
• stream (bool, optional): When True, return StreamResult (default: False)

Returns: AskResult – Object with .text (str) and .usage (TokenUsage). When stream=True, returns StreamResult – async iterable of stream events (see Streaming above); .usage after completion or aclose().

Raises:

• ValidationError: If prompt is empty or invalid parameters provided
• APIError: If the API call fails
• ConfigurationError: If API keys are missing or client initialization fails

Environment Variables

• OPENAI_API_KEY: OpenAI API key (required for OpenAI models)
• ANTHROPIC_API_KEY: Anthropic API key (required for Claude models)
• GOOGLE_API_KEY: Google API key (required for Google models)

Provider options (google_explicit_cache, google_inline_citations, anthropic_prompt_cache) are passed as constructor params to AskLLM; see docstring.

License

MIT

Contributing

Contributions welcome! Please open an issue or submit a pull request.