chore(models): mark together-ai kimi-k2.5 deprecated

[steebchen]

Summary

• Together AI announced deprecation of moonshotai/Kimi-K2.5 effective 2026-05-21, with Kimi-K2.6 as the recommended replacement.
• Adds deactivatedAt: new Date("2026-05-21") to the together-ai provider entry for the kimi-k2.5 model.
• Other providers for this model (moonshot, nebius, alibaba, embercloud, deepinfra) remain active.

Test plan

• pnpm format
• pnpm build

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Marked the together‑ai provider entry for the kimi‑k2.5 model as deprecated effective May 21, 2026.
  • Interfaces and tooling will reflect the provider’s deprecated status from that date (informational only).

[coderabbitai]

Walkthrough

Adds deprecatedAt: new Date("2026-05-21") to the together-ai provider entry for the kimi-k2.5 model in moonshotModels.

Changes

Provider Deprecation

Layer / File(s)	Summary
Kimi-k2.5 together-ai deprecatedAt packages/models/src/models/moonshot.ts	The kimi-k2.5 model's together-ai provider entry now includes deprecatedAt: new Date("2026-05-21").

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• theopenco/llmgateway#2299: Both PRs modify packages/models/src/models/moonshot.ts’s moonshotModels entries for kimi-k2/kimi-k2.5 provider mappings, updating the together-ai configuration.
• theopenco/llmgateway#2281: Both PRs add deprecatedAt timestamps to provider entries in exported model-provider mappings.
• theopenco/llmgateway#2094: Both PRs update packages/models/src/models/moonshot.ts together-ai provider mappings for Kimi models.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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 clearly and concisely summarizes the main change: marking the together-ai kimi-k2.5 model as deprecated with a timestamp.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch kimi-k2-5-deprecation-notice

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[Copilot]

Pull request overview

This PR updates the model catalog to reflect Together AI’s announced retirement of moonshotai/Kimi-K2.5 by marking the Together AI provider mapping for the kimi-k2.5 model as deactivated as of 2026-05-21. This ensures routing/selection logic can automatically avoid Together AI for this model while keeping other provider mappings available.

Changes:

• Marked the together-ai provider mapping for kimi-k2.5 as deactivated effective 2026-05-21.

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