fix: correct gpt-5.5 completion ratio

[jingx8885]

Summary\n- Add a gpt-5.5-specific completion ratio rule so it uses the official 6x output/input multiplier instead of falling through to the gpt-5 default 8x rule.\n- Add regression coverage for gpt-5.5 and dated gpt-5.5 variants.\n\n## Test\n- go test ./setting/ratio_setting

Summary by CodeRabbit

• Bug Fixes

  • Fixed completion ratio calculation for gpt-5.5 model variants to use the correct official multiplier value, ensuring accurate resource allocation and billing.

• Tests

  • Added test coverage for gpt-5.5 model completion ratio handling, including support for dated variant formats.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 66d130b2-7f31-453f-bdc3-7c1f6402f8ab

📥 Commits

Reviewing files that changed from the base of the PR and between 65b1654 and df6d862.

📒 Files selected for processing (2)

• setting/ratio_setting/model_ratio.go
• setting/ratio_setting/model_ratio_test.go

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Walkthrough

This change adds explicit support for gpt-5.5 model variants in the completion ratio configuration system. The modification introduces a new prefix check that returns a completion ratio of 6 with locked status for any model names starting with gpt-5.5, along with comprehensive unit tests to verify the behavior.

Changes

Cohort / File(s)	Summary
Model Ratio Configuration setting/ratio_setting/model_ratio.go	Added explicit gpt-5.5 model name prefix check that returns completion ratio of 6 with locked status, positioned before the generic gpt-5 fallback handler.
Unit Tests setting/ratio_setting/model_ratio_test.go	New test file with two test cases verifying that gpt-5.5 models resolve to completion ratio 6 with locked status, including tests for both the base model name and a dated variant (gpt-5.5-2026-04-24).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• feat: sync gpt-5 model ratio and support new reasoning effort #1525: Modifies the same getHardcodedCompletionModelRatio logic in setting/ratio_setting/model_ratio.go, introducing related model name handling logic that may interact with this change.

Poem

🐰 A fuzzy model named gpt-5.5 hops along,
With ratio six, locked tight and strong!
Tests verify each variant's place,
From base name to timestamped grace.
Our completion logic now complete! 🌟

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding a specific completion ratio rule for gpt-5.5 models.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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