Add Watson X foundation model definitions to model_prices_and_context…

[Gal-bloch]

Description

Added Watson X foundation model definitions to model_prices_and_context_window.json to support all currently available Watson X models.

Changes Made

• Added 29 new Watson X models with pricing, context windows, and capability flags
• Updated 2 existing Watson X models (granite-13b-instruct-v2, granite-13b-chat-v2) with correct information
• Added validation test test_watsonx_models_in_model_prices_file() in tests/test_litellm/llms/watsonx/test_watsonx.py

Models Added

IBM Granite Models:

• granite-4-h-small, granite-3-3-8b-instruct
• granite-guardian-3-2-2b, granite-guardian-3-3-8b
• granite-vision-3-2-2b
• granite-ttm-512-96-r2, granite-ttm-1024-96-r2, granite-ttm-1536-96-r2

Meta Llama Models:

• llama-3-2-1b-instruct, llama-3-2-3b-instruct
• llama-3-2-11b-vision-instruct, llama-3-2-90b-vision-instruct
• llama-3-3-70b-instruct, llama-4-maverick-17b, llama-guard-3-11b-vision

Mistral Models:

• mistral-large-2411, mistral-medium-2505, mistral-small-2503, pixtral-12b-2409

Other Models:

• Google flan-t5-xl-3b, OpenAI gpt-oss-120b, BigScience mt0-xxl-13b
• SDAIA allam-1-13b-instruct, Core42 jais-13b-chat

Source

All model information sourced from official IBM Watson X documentation:
https://dataplatform.cloud.ibm.com/docs/content/wsj/analyze-data/fm-models.html

Testing

✅ All checks passed:

• make format - Applied Black formatting
• make lint - Passed (Black, Ruff, MyPy, circular imports, import safety)
• make test-unit - Passed unit tests
• Added new test: test_watsonx_models_in_model_prices_file() validates all watsonx models have required fields with correct data types and constraints

Checklist

• Signed CLA
• Added testing (new validation test in test_watsonx.py)
• All checks pass (make lint, make test-unit)
• Scope isolated (single feature: Watson X model definitions)
• Followed Google Python Style Guide
• Used type hints where applicable

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All committers have signed the CLA.

[ishaan-jaff]

LGTM