feat: support GPT-6.1 Sol in the model catalog

[eandualem]

Add openai:gpt-6.1-sol to /api/models and recognize its dotted version in the GPT-6 settings branch. Thinking budgets now map to reasoning effort, API Responses chaining settings are applied, and the temperature tunable is omitted. Codex continues to use its existing Responses transport and omit response-ID chaining.

Extend the existing reasoning and host-tool continuation tests to the new identifier, and check that the HTTP catalog exposes it. Model metadata follows the official model documentation.

Validation: make check passed (2,971 tests passed, one database test skipped); provider traffic is mocked. No live model call.

Local review: Codex CLI 0.159.0, gpt-6-astra, high effort, one completed round, zero findings. A separate surveyor source review also found zero issues. The earlier Claude Fable review attempt could not execute because of its account limit; it is not counted as a completed review. Full test results above were obtained outside the reviewer’s read-only sandbox.

Rebased onto merged #236 and reran all checks. The rebase only changed adjacent README context; the model-support patch is unchanged from the Astra-reviewed version. CodeRabbit completed review of head 502035d with zero actionable findings and no inline threads. Its default docstring-coverage suggestion is outside this change and is not a repository-required check; all repository CI checks passed.

Part of #83.

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 04c19fc3-da4b-41b4-bfd0-3d39502ce053

📥 Commits

Reviewing files that changed from the base of the PR and between 999e60e and 502035d.

📒 Files selected for processing (7)

• README.md
• docs/subscription.md
• src/assistant_runtime/model_catalog.py
• src/assistant_runtime/services/llm/_settings.py
• tests/compatibility/test_codex_fast.py
• tests/unit/app/routes/test_models.py
• tests/unit/services/llm/test_settings.py

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📝 Walkthrough

Walkthrough

The change adds openai:gpt-6.1-sol to the model catalog and GPT-6 reasoning-settings matching. Tests and documentation also include the model.

Changes

GPT-6.1 Sol model support

Layer / File(s)	Summary
Register model and reasoning settings src/assistant_runtime/model_catalog.py, src/assistant_runtime/services/llm/_settings.py, tests/unit/app/routes/test_models.py, tests/unit/services/llm/test_settings.py	Adds the model catalog entry and includes the model in GPT-6 reasoning-settings matching. Tests cover the API model listing, reasoning effort, and temperature omission.
Cover host continuation and documentation tests/compatibility/test_codex_fast.py, README.md, docs/subscription.md	Adds the model to the host-continuation test cases and to the subscription setup and Codex host-tools model references.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to 50203

GPT-6.1 Sol support appears covered across the model listing, settings, and host-continuation paths; no actionable merge risk is evident.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 50203

The change reuses existing access and credential controls without establishing a new security concern. External-service behavior has only been checked with simulated responses, leaving limited compatibility and continuation uncertainty.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The effective changed exposure is requests selecting the newly supported identifier under existing provider configuration and supplied tool authority. The checked path establishes no additional tenant, data-store, deployment or privilege boundary introduced by the catalog entry.

Trust Boundaries and Controls

• observed — Existing subscription-only routing rejects API-key aliases, excluded models and missing connected sessions rather than falling back to API credentials. These controls remain downstream of the changed settings classifier.

Resilience and Maintainability Implications

• observed — Settings construction copies its input mapping and returns new configuration without persisting sessions, response IDs or tool state. Repetition and concurrency introduce no new state transition in this function; downstream lifecycle and recovery behavior remain outside it and were not verified against the live provider.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 14.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 5 files. (2 skipped: 2…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the primary change: adding GPT-6.1 Sol support to the model catalog and related handling.

Full details: Docstring Coverage

Explanation

Docstring coverage is 14.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 5 files. (2 skipped: 2 unsupported.)

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