release: 0.5.0

[stainless-app]

Automated Release PR

0.5.0 (2026-01-30)

Full Changelog: v0.4.0...v0.5.0

⚠ BREAKING CHANGES

• replace special flag type omittable with just null
• use camel casing for all class properties

Features

• add BaseResponse class for accessing raw responses (b803fb8)
• add idempotency header support (113b79f)
• add setters to constant parameters (a476273)
• allow both model class instances and arrays in setters (71aa7fc)
• api: add support for Structured Outputs in the Messages API (9fd43ce)
• api: migrate sending message format in output_config rather than output_format (d334157)
• better support for pagination mechanisms (829ee6e)
• improved phpstan type annotations (cc981bb)
• replace special flag type omittable with just null (e1137de)
• simplify and make the phpstan types more consistent (9f536fe)
• split out services into normal & raw types (5ba5dbf)
• support unwrapping envelopes (0ed53db)
• use camel casing for all class properties (90f0805)

Bug Fixes

• a number of serialization errors (e318451)
• correctly serialize dates (af8260d)
• support arrays in query param construction (779413f)
• typos in README.md (cb61dee)

Chores

• add git attributes and composer lock file (006c7c2)
• be more targeted in suppressing superfluous linter warnings (4b8cbf5)
• ci: Add Claude Code GitHub Workflow (#240) (4fd215b)
• ensure constant values are marked as optional in array types (66cf88c)
• formatting (5878c16)
• internal: add a basic client test (8835b21)
• internal: codegen related update (1c218af)
• internal: codegen related update (7240372)
• internal: codegen related update (9557a1c)
• internal: codegen related update (a8a13ec)
• internal: codegen related update (e2bebf6)
• internal: codegen related update (213c670)
• internal: codegen related update (2d460ff)
• internal: codegen related update (6087933)
• internal: codegen related update (3e5e21a)
• internal: codegen related update (ee26b2b)
• internal: codegen related update (b3411dd)
• internal: codegen related update (e98bd62)
• internal: codegen related update (94d88c4)
• internal: ignore stainless-internal artifacts (b144935)
• internal: improve pagination tests (94f8bc8)
• internal: minor test script reformatting (e27d068)
• internal: refactor auth by moving concern from base client into client (af7b192)
• internal: update actions/checkout version (212b762)
• internal: update phpstan comments (f0f7ddf)
• readme: remove beta warning now that we're in ga (ca60a4b)
• support jsonl streaming (b350cbc)
• switch from #[Api(optional: true|false)] to #[Required]|#[Optional] for annotations (f938919)
• update examples (eef6daf)
• use $self = clone $this; instead of $obj = clone $this; (1607f76)
• use non-trivial test assertions (c223976)
• use single quote strings (441785c)

---

This pull request is managed by Stainless's GitHub App.

The semver version number is based on included commit messages. Alternatively, you can manually set the version number in the title of this pull request.

For a better experience, it is recommended to use either rebase-merge or squash-merge when merging this pull request.

🔗 Stainless website
📚 Read the docs
🙋 Reach out for help or questions

[stainless-app]

🤖 Release is at https://github.com/anthropics/anthropic-sdk-php/releases/tag/v0.5.0 🌻