tests: use Qwen 3.5 9B for Together AI

[HareeshBahuleyan]

Description

Why

Together's agent-loop integration test intermittently returns HTTP 400 input validation errors with openai/gpt-oss-20b. Together documents Qwen 3.5 9B for agentic multi-step function calling.

What changed

Use Qwen/Qwen3.5-9B for Together's general integration tests while keeping GPT-OSS for reasoning coverage.

Notes

• uv run pytest tests/unit -q: 2,447 passed, 69 skipped.
• Hooks for tests/conftest.py pass. Full pre-commit is blocked locally by an httpx versus httpx2 mypy type conflict in unchanged tests/unit/providers/test_openai_exceptions.py:188.
• Targeted live Together CI run: test_agent_loop_sequential_tool_calls[together] passed on its first attempt in 15.93 seconds (run 34337514731).

PR Type

• 🐛 Bug Fix

Relevant issues

CI run: https://github.com/mozilla-ai/any-llm/actions/runs/34332374589

Checklist

• I understand the code I am submitting.
• I have added unit tests that prove my fix/feature works
• I have run this code locally and verified it fixes the issue.
• New and existing tests pass locally
• Documentation was updated where necessary
• I have read and followed the contribution guidelines
• AI Usage:
  • No AI was used.
  • AI was used for drafting/refactoring.
  • This is fully AI-generated.

AI Usage Information

• AI Model used: OpenAI GPT-5.6 Sol
• AI Developer Tool used: Pi
• Any other info you'd like to share: The model selection was verified against Together's official model catalog and agentic function-calling documentation.

When answering questions by the reviewer, please respond yourself, do not copy/paste the reviewer comments into an AI system and paste back its answer. We want to discuss with you, not my AI :)

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Summary by CodeRabbit

• Tests
  • Updated the test configuration to use the Qwen 3.5 9B model for Together AI provider coverage.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 6944a38d-c4bb-43b3-9aa5-7ce7157238c5

📥 Commits

Reviewing files that changed from the base of the PR and between 7557ca5 and bce0087.

📒 Files selected for processing (1)

• tests/conftest.py

Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review.

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Walkthrough

Changes

Together test model

Layer / File(s)	Summary
Update Together model mapping tests/conftest.py	The Together provider test model changes from openai/gpt-oss-20b to Qwen/Qwen3.5-9B.

Suggested reviewers: njbrake

Priority: ⬇️ Low

Merge Risk: ⚪ Minimal · up to bce00

Together integration tests will use Qwen/Qwen3.5-9B for general coverage while GPT-OSS remains available for reasoning coverage. No actionable merge-blocking risk is identified.

🚥 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%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	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.
Title check	✅ Passed	The title is concise, specific, and accurately describes the model change for Together AI tests.
Description check	✅ Passed	The description follows the required template, explains the reason and scope of the change, identifies the PR type, records relevant issues, documents validation results and limitations, and completes…

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/together-agent-loop-model

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
see 31 files with indirect coverage changes

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