fix(openai): Record cached and reasoning tokens for Completions

[alexander-alderman-webb]

Description

Issues

Reminders

• Please add tests to validate your changes, and lint your code using tox -e linters.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

This is how your changes will appear in the changelog.
Entries from this PR are highlighted with a left border (blockquote style).

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New Features ✨

Langchain

• Set gen_ai.operation.name and gen_ai.pipeline.name on LLM spans by ericapisani in #5849
• Broaden AI provider detection beyond OpenAI and Anthropic by ericapisani in #5707
• Update LLM span operation to gen_ai.generate_text by ericapisani in #5796

Bug Fixes 🐛

Ci

• Use gh CLI to convert PR to draft by stephanie-anderson in #5874
• Use GitHub App token for draft PR enforcement by stephanie-anderson in #5871

Openai

• Record cached and reasoning tokens for Completions by alexander-alderman-webb in #5881

• Simplify Responses input handling by alexander-alderman-webb in #5695
• Use max_output_tokens for Responses API by alexander-alderman-webb in #5693
• Always set gen_ai.response.streaming for Completions by alexander-alderman-webb in #5692
• Simplify Completions input handling by alexander-alderman-webb in #5690
• Simplify embeddings input handling by alexander-alderman-webb in #5688

Other

• (google-genai) Guard response extraction by alexander-alderman-webb in #5869

Internal Changes 🔧

Langchain

• Add text completion test by alexander-alderman-webb in #5740
• Add tool execution test by alexander-alderman-webb in #5739
• Add basic agent test with Responses call by alexander-alderman-webb in #5726
• Replace mocks with httpx types by alexander-alderman-webb in #5724
• Consolidate span origin assertion by alexander-alderman-webb in #5723
• Consolidate available tools assertion by alexander-alderman-webb in #5721

Openai

• Replace mocks with httpx types for streaming Completions by alexander-alderman-webb in #5879
• Move input handling code into API-specific functions by alexander-alderman-webb in #5687

Other

• (asyncpg) Normalize query whitespace in integration by ericapisani in #5855
• Exclude compromised litellm versions by alexander-alderman-webb in #5876
• Reactivate litellm tests by alexander-alderman-webb in #5853
• Add note to coordinate with assignee before PR submission by sentrivana in #5868
• Temporarily stop running litellm tests by alexander-alderman-webb in #5851

Other

• ci+docs: Add draft PR enforcement by stephanie-anderson in #5867

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[github-actions]

Codecov Results 📊

✅ 4 passed | Total: 4 | Pass Rate: 100% | Execution Time: 1.06s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -3
Passed Tests	📉 -3
Failed Tests	—
Skipped Tests	—

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 16048 uncovered lines.
✅ Project coverage is 22.24%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    22.15%    22.24%    +0.09%
==========================================
  Files          189       189         —
  Lines        20648     20639        -9
  Branches      6760      6762        +2
==========================================
+ Hits          4574      4591       +17
- Misses       16074     16048       -26
- Partials       376       377        +1

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