release: 4.1.0

[stainless-app]

Automated Release PR

4.1.0 (2026-09-01)

Full Changelog: v4.0.0...v4.1.0

Features

• api: update via SDK Studio (#61) (9c0c551)
• clean up environment call outs (696f18b)
• client: add custom JSON encoder for extended type support (87eaded)
• client: add follow_redirects request option (6eb41c9)
• client: add support for aiohttp (6f6ddd9)
• client: add support for binary request streaming (41c399b)
• client: allow passing NotGiven for body (#67) (3ad7f25)
• client: send X-Stainless-Read-Timeout header (#63) (a594c75)
• client: support file upload requests (fde965a)
• improve future compat with pydantic v3 (bccbddf)
• internal/types: support eagerly validating pydantic iterators (8e8ca68)
• internal: implement indices array format for query and form serialization (c601950)
• stlc: configurable CI runner and private-production-repo support in workflow templates (2da8c4d)
• support setting headers via env (20336c3)
• types: replace List[str] with SequenceNotStr in params (0578887)

Bug Fixes

• asyncify on non-asyncio runtimes (#66) (ca310cd)
• avoid newer type syntax (db10820)
• ci: correct conditional (66eb0ef)
• ci: ensure pip is always available (#78) (d3d295a)
• ci: release-doctor — report correct token name (65cdccf)
• ci: remove publishing patch (#79) (493f504)
• client: add missing f-string prefix in file type error message (8026d49)
• client: close streams without requiring full consumption (e783145)
• client: correctly parse binary response | stream (3924997)
• client: don't send Content-Type header on GET requests (6bcbc4e)
• client: mark some request bodies as optional (3ad7f25)
• client: preserve hardcoded query params when merging with user params (12d00c8)
• compat with Python 3.14 (f7d6103)
• compat: update signatures of model_dump and model_dump_json for Pydantic v1 (898ca7b)
• deps: bump minimum typing-extensions version (323a703)
• ensure file data are only sent as 1 parameter (2a24f49)
• ensure streams are always closed (f89af68)
• package: support direct resource imports (ad2d130)
• parsing: correctly handle nested discriminated unions (cd511d2)
• parsing: ignore empty metadata (bdd8ead)
• parsing: parse extra field types (470d8a8)
• perf: optimize some hot paths (7cc4937)
• perf: skip traversing types for NotGiven values (38509ba)
• pydantic v1: more robust ModelField.annotation check (3dc3480)
• pydantic: do not pass by_alias unless set (887a8ec)
• sanitize endpoint path params (40f9b7b)
• tests: fix: tests which call HTTP endpoints directly with the example parameters (539215f)
• types: allow pyright to infer TypedDict types within SequenceNotStr (84b4806)
• types: handle more discriminated union shapes (#77) (8b6dcf0)
• use async_to_httpx_files in patch method (6bfd0c0)
• use correct field name format for multipart file arrays (0f7a6a4)

Performance Improvements

• client: optimize file structure copying in multipart requests (639db35)

Chores

• add Python 3.14 classifier and testing (c172e9c)
• broadly detect json family of content-type headers (febefbc)
• bump httpx-aiohttp version to 0.1.9 (7aeb4c8)
• ci: add timeout thresholds for CI jobs (d5cbcd0)
• ci: change upload type (d7e4405)
• ci: enable for pull requests (1ea6fbc)
• ci: fix installation instructions (6291f4a)
• ci: only run for pushes and fork pull requests (5d00f3e)
• ci: only use depot for staging repos (19ee773)
• ci: skip lint on metadata-only changes (287d210)
• ci: skip uploading artifacts on stainless-internal branches (d12f89a)
• ci: upgrade actions/github-script (bdad5ed)
• ci: upload sdks to package manager (598ec7e)
• client: minor internal fixes (1e29d3b)
• deps: mypy 1.18.1 has a regression, pin to 1.17 (fd940b6)
• do not install brew dependencies in ./scripts/bootstrap by default (67c48f0)
• docs: grammar improvements (540e711)
• docs: remove reference to rye shell (ec32daa)
• docs: update client docstring (#71) (b41543a)
• docs: use environment variables for authentication in code snippets (ff7f0ef)
• fix typos (#80) (c1576cc)
• format all api.md files (034e708)
• internal/tests: avoid race condition with implicit client cleanup (d3a5435)
• internal: add --fix argument to lint script (0b1e68e)
• internal: add missing files argument to base client (5547d1b)
• internal: add request options to SSE classes (931a27e)
• internal: add Sequence related utils (5f815ef)
• internal: avoid errors for isinstance checks on proxies (5dc0949)
• internal: base client updates (0ac179a)
• internal: bump dependencies (5c298f6)
• internal: bump pinned h11 dep (6cafe07)
• internal: bump pyright version (81c2baf)
• internal: bump rye to 0.44.0 (#76) (21a20b3)
• internal: change ci workflow machines (656643d)
• internal: codegen related update (0b4efb7)
• internal: codegen related update (2f8fbc4)
• internal: codegen related update (d6d5a1d)
• internal: codegen related update (a145cee)
• internal: codegen related update (#75) (db19786)
• internal: detect missing future annotations with ruff (23b94ed)
• internal: expand CI branch coverage (7fd1145)
• internal: fix devcontainers setup (#68) (97b7254)
• internal: fix lint error on Python 3.14 (1d9c80a)
• internal: fix list file params (1b5e333)
• internal: fix ruff target version (1437b86)
• internal: fix type traversing dictionary params (#64) (1322c80)
• internal: grammar fix (it's -> its) (8b1cdb7)
• internal: import reformatting (8a3f6f0)
• internal: make test_proxy_environment_variables more resilient (f79d30c)
• internal: make test_proxy_environment_variables more resilient to env (08e33e4)
• internal: minor type handling changes (#65) (7e69125)
• internal: more robust bootstrap script (449a9c3)
• internal: move mypy configurations to pyproject.toml file (f87b268)
• internal: properly set pydantic_private (#69) (bc25b84)
• internal: reduce CI branch coverage (2492996)
• internal: refactor retries to not use recursion (055e329)
• internal: reformat pyproject.toml (5b57987)
• internal: remove extra empty newlines (#74) (3d90dff)
• internal: remove mock server code (cb06a16)
• internal: remove trailing character (#81) (4cfa80b)
• internal: remove unused http client options forwarding (#72) (69a44e3)
• internal: slight transform perf improvement (#82) (5498eaf)
• internal: tweak CI branches (2372dd8)
• internal: update actions/checkout version (54d6bd9)
• internal: update comment in script (103820e)
• internal: update conftest.py (83531b4)
• internal: update gitignore (15b9637)
• internal: update models test (421a2b5)
• internal: update pydantic dependency (5dd09a4)
• internal: update pyright exclude list (f306088)
• internal: update pyright settings (2d267e1)
• package: drop Python 3.8 support (95ca18d)
• package: mark python 3.13 as supported (06ad64f)
• project: add settings file for vscode (6754b39)
• readme: fix version rendering on pypi (b1e9e51)
• readme: update badges (f3f214f)
• speedup initial import (3b3f4e6)
• tests: add tests for httpx client instantiation & proxies (5e172cd)
• tests: run tests in parallel (497b381)
• tests: simplify get_platform test (ef07d85)
• tests: skip some failing tests on the latest python versions (39d037c)
• types: change optional parameter type from NotGiven to Omit (14cb9a9)
• update @stainless-api/prism-cli to v5.15.0 (d766a01)
• update github action (d0f9d9e)
• update lockfile (77726a0)
• update mock server docs (1241c00)

Documentation

• client: fix httpx.Timeout documentation reference (3341b85)
• update URLs from stainlessapi.com to stainless.com (#70) (08062c4)

---

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Greptile Summary

This release updates the SDK to 4.1.0, modernizes its generated client foundation, and expands transport, serialization, upload, compatibility, and CI behavior.

• Adds aiohttp support, binary request streaming, custom JSON encoding, request-level redirect control, and multipart upload improvements.
• Refactors retry and response lifecycle handling while retaining parallel synchronous and asynchronous behavior.
• Updates generated Workers APIs and response models, including sanitized path parameters and consolidated voice deployment types.
• Raises the minimum Python version to 3.9 and refreshes dependencies, tests, documentation, and release automation.

Confidence Score: 5/5

The PR appears safe to merge because no changed-code defect with a reachable failure path remains.

The client, generated resource, packaging, and automation changes preserve the documented sync/async, serialization, lifecycle, and public-version contracts, while the investigated security paths were either unreachable in this repository or pre-existing.

Important Files Changed

Filename	Overview
src/brainbase/_base_client.py	Refactors request retries and lifecycle handling while adding binary content, redirect options, custom JSON encoding, and aiohttp transport support.
src/brainbase/_models.py	Expands Pydantic compatibility, iterable validation, discriminated-union handling, and request option types.
src/brainbase/_files.py	Updates synchronous and asynchronous file normalization for multipart requests.
src/brainbase/resources/workers/deployments/voice.py	Sanitizes path parameters and consolidates voice operation responses under VoiceDeployment.
src/brainbase/resources/workers/flows.py	Adopts omitted-value semantics and sanitized path templates across synchronous and asynchronous flow operations.
src/brainbase/resources/workers/workers.py	Updates generated worker operations to use omitted-value defaults and shared path handling.
pyproject.toml	Releases version 4.1.0, raises the Python floor to 3.9, adds the aiohttp extra, and refreshes build and validation configuration.
.github/workflows/ci.yml	Broadens branch validation, adds build and artifact-upload stages, pins actions, and introduces job timeouts.
scripts/utils/upload-artifact.sh	Adds artifact upload support for the separately gated Stainless staging repository.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  Consumer[SDK consumer] --> Client[Sync or async client]
  Client --> Resources[Workers resources]
  Resources --> Options[Request transformation and options]
  Options --> Transport[HTTPX or aiohttp transport]
  Transport --> Retry[Retry and response lifecycle]
  Retry --> API[Brainbase API]
  API --> Parsing[Typed response parsing or streaming]
  Parsing --> Consumer

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