fix(prices): fix xai/grok-4 capabilities

[HoosseinRahimi]

TLDR

Problem this solves:

• In model_prices_and_context_window.json and litellm/model_prices_and_context_window_backup.json, capability flags (supports_reasoning, supports_vision, and supports_response_schema) were missing on xai/grok-4 and its snapshot aliases.

How it solves it:

• Flags xai/grok-4, xai/grok-4-0709, xai/grok-4-latest, and xai/grok-4-fast-reasoning with "supports_reasoning": true, "supports_vision": true, and "supports_response_schema": true.
• Flags xai/grok-4-fast-non-reasoning with "supports_vision": true and "supports_response_schema": true.
• Retains existing "deprecation_date": "2026-05-15" in accordance with xAI redirected slug requirements and regression tests.
• Keeps model_prices_and_context_window.json and litellm/model_prices_and_context_window_backup.json byte-for-byte identical.

Relevant issues

Fixes #41370

Type

🐛 Bug Fix

Pre-Submission checklist

• I have verified file parity between root and backup price maps.
• My PR passes the cost map guard check (python ci_cd/cost_map_guard.py).
• My PR's scope is as isolated as possible; it only solves 1 specific problem.

[CLAassistant]

All committers have signed the CLA.

[greptile-apps]

Greptile Summary

This PR updates Grok-4 capability metadata and removes deprecation dates from ten xAI model entries. The root and backup maps remain byte-for-byte identical, but an existing xAI registry test still classifies those entries as retired and will fail

Confidence Score: 4/5

This PR is not safe to merge until the xAI retired-slug test and intended lifecycle classification are made consistent

Removing deprecation_date from the Grok-4 entries makes the unchanged registry assertion disagree with the price maps, causing the xAI test suite to fail

Files Needing Attention: model_prices_and_context_window.json, litellm/model_prices_and_context_window_backup.json

Important Files Changed

Filename	Overview
model_prices_and_context_window.json	Adds Grok-4 capability flags and removes deprecation dates, conflicting with the existing retired-slug registry test
litellm/model_prices_and_context_window_backup.json	Mirrors the root metadata changes exactly and therefore carries the same test-breaking conflict

_{Reviews (1): Last reviewed commit: "fix(prices): fix xai/grok-4 capabilities..." | Re-trigger Greptile}

[greptile-apps]

Retired-slug test fails

Removing these dates leaves the unchanged registry test expecting every Grok-4 slug to be marked retired, causing the xAI test suite to fail

[codspeed]

Merging this PR will not alter performance

✅ 31 untouched benchmarks

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_{Comparing HoosseinRahimi:fix-xai-grok-4-metadata (6832ba5) with main (5960881)¹}

Footnotes

1. No successful run was found on main (a8979fe) during the generation of this report, so 5960881 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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