examples: write streamed images in binary mode

[jbeckwith-oai]

Summary

• write decoded partial and completed image data with File.binwrite
• add an offline regression test that executes the real image streaming example and verifies exact PNG bytes

Evidence

The example decodes base64 PNG data and previously passed the resulting binary string to File.write. Text-mode writes can translate byte sequences on platforms with text/binary distinctions. The fixture includes CRLF and control-byte sequences and verifies both generated files byte-for-byte.

Blast radius and compatibility

This changes only the handwritten image streaming example and its focused test. It does not change the SDK runtime, generated code, public API, type signatures, dependencies, serialization, transport, or authentication behavior.

Generator ownership

examples/ and this test are handwritten repository artifacts and are not generator-owned.

Validation

• bundle exec ruby -Itest test/openai/image_stream_example_test.rb — 1 run, 11 assertions, passed
• bundle exec rake test:examples:inventory — passed
• bundle exec rake lint — RuboCop, rubyfmt, RBI, and RBS validation passed
• ./scripts/test with a private TMPDIR — 1,088 runs, 9,799 assertions, 0 failures, 1 unrelated local error in the unchanged realtime HTTP proxy invariant
• isolated formatting-policy and RBS-script tests — 22 runs, 275 assertions, passed
• git diff --check — passed
• thermo-nuclear code-quality review — no findings

[github-actions]

Castiron custom code

✅ No new custom-code files detected.

48 mixed files remain; 0 existing customizations changed.

Compared 851f53438f5a → ccc119f58ed3. Generated baselines verified.

48 existing customizations unchanged

• lib/openai.rb
• lib/openai/client.rb
• lib/openai/models/chat/chat_completion_message.rb
• lib/openai/models/chat/chat_completion_message_function_tool_call.rb
• lib/openai/models/chat/completion_create_params.rb
• lib/openai/models/response_format_json_schema.rb
• lib/openai/models/responses/function_tool.rb
• lib/openai/models/responses/response.rb
• lib/openai/models/responses/response_create_params.rb
• lib/openai/models/responses/response_format_text_config.rb
• lib/openai/models/responses/response_format_text_json_schema_config.rb
• lib/openai/models/responses/response_function_tool_call.rb
• lib/openai/models/responses/response_function_web_search.rb
• lib/openai/models/responses/response_output_text.rb
• lib/openai/models/responses/tool.rb
• lib/openai/resources/beta/responses.rb
• lib/openai/resources/beta/threads.rb
• lib/openai/resources/chat/completions.rb
• lib/openai/resources/files.rb
• lib/openai/resources/responses.rb
• lib/openai/resources/vector_stores/file_batches.rb
• lib/openai/resources/vector_stores/files.rb
• lib/openai/resources/webhooks.rb
• rbi/openai/client.rbi
• rbi/openai/models/chat/chat_completion_message.rbi
• rbi/openai/models/chat/chat_completion_message_function_tool_call.rbi
• rbi/openai/models/chat/completion_create_params.rbi
• rbi/openai/models/response_format_json_schema.rbi
• rbi/openai/models/responses/response.rbi
• rbi/openai/models/responses/response_create_params.rbi
• rbi/openai/models/responses/response_function_tool_call.rbi
• rbi/openai/models/responses/response_function_web_search.rbi
• rbi/openai/models/responses/response_output_text.rbi
• rbi/openai/resources/chat/completions.rbi
• rbi/openai/resources/files.rbi
• rbi/openai/resources/responses.rbi
• rbi/openai/resources/vector_stores/file_batches.rbi
• rbi/openai/resources/vector_stores/files.rbi
• scripts/castiron/README.md
• scripts/castiron/custom_code_report.py

8 more in the full report.

A changed generated baseline means this report cannot reliably identify which handwritten lines changed.

Inspect the custom-code diff

Download the exact patch produced by this run (requires repository access):

gh run download 32447293012 --repo openai/openai-ruby \
  --name castiron-custom-code-32447293012-1 --dir /tmp/castiron-custom-code-32447293012-1
git apply --stat /tmp/castiron-custom-code-32447293012-1/custom-code.patch
cat /tmp/castiron-custom-code-32447293012-1/custom-code.patch

Or reproduce it from an SDK checkout containing the vendored reporter:

git fetch --no-tags origin 851f53438f5afc7f32e3ccbe866fd03bbade576a ccc119f58ed385c49ecdbd287bcfbf749eb9b0be
python3 scripts/castiron/custom_code_report.py report \
  --base 851f53438f5afc7f32e3ccbe866fd03bbade576a \
  --head ccc119f58ed385c49ecdbd287bcfbf749eb9b0be --fetch --require-head-hash --public \
  --out /tmp/castiron-custom-code-ccc119f58ed3
cat /tmp/castiron-custom-code-ccc119f58ed3/custom-code.patch

This is the current full custom patch for mixed files, not an attribution of only the handwritten lines changed by this PR.

Full report and patch

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-08-21T04:33:24.868736Z	ccc119f	Draft marked ready
🔒 Security Review	✅ Completed 2026-08-21T04:33:29.126134Z	ccc119f	Draft marked ready

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review" or "@codex security review".

Codex reacts with 👀 while any review is running, comments if it has suggestions, and reacts with 👍 once all reviews finish with no findings.

[openai-sdks]

OkTest Summary

✅ 237/237 SDK tests passed in 10.915s for Ruby SDK PR #506.

Test results — 42 files

Test	Result	Time
tests/chat-completions-complex-body.test.ts	✅ Passed	246ms
tests/chat-completions-create.test.ts	✅ Passed	291ms
tests/chat-completions-stream.test.ts	✅ Passed	152ms
tests/files-content-binary.test.ts	✅ Passed	226ms
tests/files-create-multipart.test.ts	✅ Passed	196ms
tests/files-list-pagination.test.ts	✅ Passed	171ms
tests/initialize-config.test.ts	✅ Passed	181ms
tests/instance-isolation.test.ts	✅ Passed	237ms
tests/models-list.test.ts	✅ Passed	161ms
tests/responses-background-lifecycle.test.ts	✅ Passed	243ms
tests/responses-body-method-errors.test.ts	✅ Passed	675ms
tests/responses-cancel-timeout.test.ts	✅ Passed	272ms
tests/responses-cancel.test.ts	✅ Passed	370ms
tests/responses-compact-retries.test.ts	✅ Passed	300ms
tests/responses-compact.test.ts	✅ Passed	341ms
tests/responses-create-advanced-stream.test.ts	✅ Passed	172ms
tests/responses-create-advanced.test.ts	✅ Passed	211ms
tests/responses-create-disconnect.test.ts	✅ Passed	1.039s
tests/responses-create-errors.test.ts	✅ Passed	377ms
tests/responses-create-malformed-api-responses.test.ts	✅ Passed	136ms
tests/responses-create-retries.test.ts	✅ Passed	260ms
tests/responses-create-stream-failures.test.ts	✅ Passed	176ms
tests/responses-create-stream-timeout.test.ts	✅ Passed	229ms
tests/responses-create-stream-wire.test.ts	✅ Passed	2.464s
tests/responses-create-stream.test.ts	✅ Passed	152ms
tests/responses-create-terminal-states.test.ts	✅ Passed	386ms
tests/responses-create-timeout.test.ts	✅ Passed	271ms
tests/responses-create.test.ts	✅ Passed	302ms
tests/responses-delete.test.ts	✅ Passed	245ms
tests/responses-input-items-errors.test.ts	✅ Passed	194ms
tests/responses-input-items-list.test.ts	✅ Passed	195ms
tests/responses-input-items-options.test.ts	✅ Passed	211ms
tests/responses-input-tokens-count-timeout.test.ts	✅ Passed	389ms
tests/responses-input-tokens-count.test.ts	✅ Passed	390ms
tests/responses-malformed-inputs.test.ts	✅ Passed	2.156s
tests/responses-not-found-errors.test.ts	✅ Passed	420ms
tests/responses-parse.test.ts	✅ Passed	261ms
tests/responses-retrieve-retries.test.ts	✅ Passed	287ms
tests/responses-retrieve.test.ts	✅ Passed	368ms
tests/responses-stored-method-errors.test.ts	✅ Passed	956ms
tests/retry-behavior.test.ts	✅ Passed	2.954s
tests/sdk-error-shape.test.ts	✅ Passed	493ms

View OkTest run #32447294677

_{SDK merge (198b7b3bece9) · head (ccc119f58ed3) · base (851f53438f5a) · OkTest (2b1bdfd25e98)}