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codex/sdk/python/docs/getting-started.md
2026-03-12 10:15:53 -07:00

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# Getting Started
This is the fastest path from install to a multi-turn thread using the public SDK surface.
The SDK is experimental. Treat the API, bundled runtime strategy, and packaging details as unstable until the first public release.
## 1) Install
From repo root:
```bash
cd sdk/python
python -m pip install -e .
```
Requirements:
- Python `>=3.10`
- installed `codex-cli-bin` runtime package, or an explicit `codex_bin` override
- local Codex auth/session configured
## 2) Run your first turn (sync)
```python
from codex_app_server import Codex, TextInput
with Codex() as codex:
print("Server:", codex.metadata.server_name, codex.metadata.server_version)
thread = codex.thread_start(model="gpt-5", config={"model_reasoning_effort": "high"})
result = thread.turn(TextInput("Say hello in one sentence.")).run()
print("Thread:", result.thread_id)
print("Turn:", result.turn_id)
print("Status:", result.status)
print("Text:", result.text)
```
What happened:
- `Codex()` started and initialized `codex app-server`.
- `thread_start(...)` created a thread.
- `turn(...).run()` consumed events until `turn/completed` and returned a `TurnResult`.
- one client can have only one active `Turn.stream()` / `Turn.run()` consumer at a time in the current experimental build
## 3) Continue the same thread (multi-turn)
```python
from codex_app_server import Codex, TextInput
with Codex() as codex:
thread = codex.thread_start(model="gpt-5", config={"model_reasoning_effort": "high"})
first = thread.turn(TextInput("Summarize Rust ownership in 2 bullets.")).run()
second = thread.turn(TextInput("Now explain it to a Python developer.")).run()
print("first:", first.text)
print("second:", second.text)
```
## 4) Async parity
```python
import asyncio
from codex_app_server import AsyncCodex, TextInput
async def main() -> None:
async with AsyncCodex() as codex:
thread = await codex.thread_start(model="gpt-5", config={"model_reasoning_effort": "high"})
turn = await thread.turn(TextInput("Continue where we left off."))
result = await turn.run()
print(result.text)
asyncio.run(main())
```
## 5) Resume an existing thread
```python
from codex_app_server import Codex, TextInput
THREAD_ID = "thr_123" # replace with a real id
with Codex() as codex:
thread = codex.thread_resume(THREAD_ID)
result = thread.turn(TextInput("Continue where we left off.")).run()
print(result.text)
```
## 6) Next stops
- API surface and signatures: `docs/api-reference.md`
- Common decisions/pitfalls: `docs/faq.md`
- End-to-end runnable examples: `examples/README.md`