coffee_with_llm

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

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, Google Gemini, and Inception Mercury
• 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/Inception pass through cached_tokens when present
• Attachments: Send PDFs and images as input with one Attachment type; each provider translates it to its own native format (Inception Mercury is text-only)
• Citations: Automatic citation injection for Google Gemini responses
• Grounded flows: Two-pass search → JSON (ask_with_grounded_json) or markdown (ask_with_grounded_markdown) with citation allowlists
• Gemini Interactions API: Optional ask_interaction() for server-side multi-turn sessions
• Extended thinking: Single reasoning_effort knob ("low" | "medium" | "high", plus "instant" on Inception) translates to OpenAI reasoning.effort, Anthropic adaptive output_config.effort (4.6+) or legacy thinking.budget_tokens, Google thinking_config, and Inception reasoning_effort

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:

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-…, mercury-… still auto-route).

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

Configuration

Copy .env.example to .env and set the keys you need. Config.from_env() loads .env automatically — no export required.

cp .env.example .env

OPENAI_API_KEY=...
ANTHROPIC_API_KEY=...
GOOGLE_API_KEY=...
INCEPTION_API_KEY=...

Smoke-test Inception wiring (live API)::

uv run scripts/test_inception_wiring.py

Live Gemini citation smoke tests (require GOOGLE_API_KEY in .env)::

uv run scripts/test_json_hook_citations.py      # curator JSON hooks
uv run scripts/test_interactions_api.py         # Interactions API two-turn
uv run scripts/test_markdown_web_citations.py   # orchestrator web + markdown

Each script logs per-stage latency and token usage. See CHANGELOG.md for release notes.

Grounded search + citations (Gemini)

When JSON output and Google Search are combined in one call, Gemini often omits grounding metadata. Use two-pass helpers instead:

from coffee_with_llm import AskLLM, ask_with_grounded_json, ask_with_grounded_markdown

llm = AskLLM(model="google/gemini-flash-latest")

# Curator-style JSON card hooks
result = await ask_with_grounded_json(
    llm,
    research_prompt="Research two cards about …",
    json_prompt="Convert your notes into a JSON array of cards …",
)

# Orchestrator-style markdown reply
web, markdown, allowed_urls = await ask_with_grounded_markdown(
    llm,
    web_query="What is new in …?",
    markdown_prompt="Write a markdown answer with cited bullets …",
)

Pass 1 searches the web; pass 2 formats output using only URLs from pass 1.

With search attached, ask() also attaches Gemini's URL context tool, so a link in the prompt is opened and read rather than looked up in Google's index. A new or small page the index does not hold is read instead of reported missing. A site that refuses the fetch falls back to search.

Gemini Interactions API

For server-side session state (multi-turn agent flows):

first = await llm.ask_interaction(
    prompt="Search and summarize …",
    system_instruct="Use web search.",
)
follow_up = await llm.ask_interaction(
    prompt="Turn that into JSON …",
    previous_interaction_id=first.interaction_id,
)

Requires google-genai ≥ 2.0.0. Default ask() still uses generateContent.

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, Inception)

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
)

The model is shown result. Fields a tool returns beside ok, result and error are folded into result (its own keys win a clash), so {"ok": True, "temp": 18} reaches the model as result: {"temp": 18}.

When a tool loop ends without writing anything, usually because it hit max_steps or max_effective_tool_steps right after a tool call, the client asks once more with tool calls switched off, so the loop ends in an answer from what the tools returned. An empty answer from a call without tools is retried like a rate limit; one from a tool loop is not, since a retry would run every tool again.

Extended Thinking (provider-agnostic)

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

# Same call works on OpenAI, Anthropic, Google, or Inception
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. Gemini 3 and later are sent thinking_level, which Google recommends over the budget (a request with both is refused). Gemini 2.x is sent thinking_budget, and so is a model whose name does not say its generation, such as gemini-flash-latest: Gemini 3 still accepts a budget, 2.x rejects a level. With no reasoning_effort, each model uses its own default level (medium on gemini-3.8-flash). Thinking counts against max_tokens, and is billed as output: it is in output_tokens and cost_usd, and reasoning_tokens says how much. With no reasoning_effort, the model thinks as long as it likes, and a long think can use up max_tokens before the answer is written; stop then says so.
• Inception (Mercury) — passed as reasoning_effort on Chat Completions (instant | low | medium | high). Supports tool calling and structured outputs; text-only (no attachments).

Attachments (PDFs and images)

Build one Attachment and it works on OpenAI, Anthropic, and Google — each translates it into its own native content part (Anthropic document/image blocks, OpenAI input_file/input_image parts, Google inline_data parts). Inception Mercury is text-only and raises ValidationError if attachments are passed.

from coffee_with_llm import AskLLM, Attachment

llm = AskLLM(model="claude-opus-4-8")  # or gpt-…, or gemini-…

result = await llm.ask(
    prompt="Which model wins on each benchmark? Read the charts.",
    attachments=[Attachment.from_path("model-card.pdf")],
)
print(result.text)

Construct from bytes when the file never touches disk:

Attachment(data=pdf_bytes, mime_type="application/pdf", filename="report.pdf")

Notes:

• Input-only. Attachments are what the model reads; the response is always text.
• Attached to the prompt turn, never to messages history.
• Works with stream=True — the binary goes in, the answer streams out.
• Supported types: application/pdf, image/png, image/jpeg, image/gif, image/webp. Anything else raises ValidationError before any network call.
• Attachments are re-sent (and re-billed) on every request; providers do not index or persist them. For repeated questions about the same document, enable the provider's context/prompt cache.

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.

Why it stopped

A call cut off at max_tokens ends exactly like a finished one. AskResult.stop, and StreamResult.stop once the stream has ended, say which, the same way for every provider:

result = await llm.ask(prompt="...", max_tokens=16384)
if result.stop and result.stop.truncated:
    ...  # cut off: the answer is not whole

stop.reason is one of StopReason: end (finished), max_tokens (cut off), content_filter (a safety or recitation filter, or a refusal), tool_use (it was still asking for a tool, e.g. a loop out of steps) or other. stop.raw is the provider's own word: MAX_TOKENS, end_turn, max_output_tokens, length. A stream never yields the Stop; it is read from result.stop.

Understanding token usage

TokenUsage exposes provider-native buckets plus computed totals:

An alias has no price of its own: Google swaps it to a new model with every release. A call is priced at the model that served it, and at the model asked for only when the provider did not say. A model with no price is left with cost_usd=None and a warning naming it, never priced as another model. Prices that change on a date (Gemini 3.8, 3.7 and 3.6 Flash double on 2027-01-01) are applied by the day of the call; estimate_cost(usage, model, on=date(...)) prices another day.

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

Inception (Mercury)

• mercury-2 (chat; also inception/mercury-2)
• Short alias: mercury → mercury-2
• mercury-* ids auto-route to Inception
• Text-only Chat Completions (tool calling + structured outputs + reasoning_effort)

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-…, mercury-…, 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). In generate_content mode URL context is attached with it, so a link in the prompt is read. Ignored for non-Google models.
• google_api_mode (str, optional): "generate_content" (default) or "interactions" for Gemini routing.

ask_interaction(...)

Gemini Interactions API only. Same general parameters as ask where applicable, plus previous_interaction_id for multi-turn sessions. Returns AskResult with interaction_id set.

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" (Inception also: "instant"). Provider-agnostic — see Extended Thinking.
• tools_schema (list, optional): Tool/function calling schema (OpenAI, Anthropic, Google, Inception)
• response_format (dict, optional): Response format specification
• execute_tool_cb (callable, optional): Tool execution callback (OpenAI, Anthropic, Google, Inception)
• 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)
• attachments (list[Attachment], optional): PDFs or images for the model to read alongside prompt. Provider-agnostic — see Attachments.

Returns: AskResult – Object with .text (str), .usage (TokenUsage), .stop (why it stopped, see above), and .url_retrievals: for Gemini, each link in the prompt that URL context tried to open, as UrlRetrieval(url, ok, status). ok is false when the site refused the fetch and the answer came from search instead; empty when there was no link, and for other providers. When stream=True, returns StreamResult – async iterable of stream events (see Streaming above); .usage after completion or aclose(), .stop after completion.

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

Loaded from .env (see .env.example) or the process environment:

• 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)
• INCEPTION_API_KEY: Inception API key (required for Mercury 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.