update cohere text models.

[phlogisticfugu]

fix: cohere command-r-plus model is deprecated - causing tests to break

• update the models to include the latest models from cohere. Keep deprecated models for the moment.
• update tests and example code appropriately to use the latest command-a-reasoning-08-2025

---

Important

Update Cohere model to command-a-reasoning-08-2025 across documentation, examples, and tests, while retaining deprecated models for compatibility.

• Model Update:
  • Update Cohere model from command-r-plus to command-a-reasoning-08-2025 in document_segmentation.md, cohere.md, and cohere.py.
  • Update from_provider() in auto_client.py to include command-a-reasoning-08-2025.
  • Add command-a-reasoning-08-2025 to KnownModelName in models.py.
• Tests:
  • Update tests in test_json_schema.py and test_new_client.py to use command-a-reasoning-08-2025.
  • Modify test_auto_client.py to include command-a-reasoning-08-2025 in the list of providers to test.
• Misc:
  • Keep deprecated command-r-plus model in models.py for backward compatibility.

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[ellipsis-dev]

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1. instructor/models.py:25

• Draft comment:
  Duplicate model entry: 'cohere/command-r7b-12-2024' appears twice. Consider removing the duplicate to avoid ambiguity.
• Reason this comment was not posted:
  Comment was not on a location in the diff, so it can't be submitted as a review comment.

Workflow ID: wflow_rUMyeBLRlrNtm8AV

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