feat(backend/blocks): add latest grok models (#11422)

This PR adds some of the latest grok models to the platform
``x-ai/grok-4-fast``, ``x-ai/grok-4.1-fast`` and ``ai/grok-code-fast-1``

#### For code changes:
- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [x] I have tested my changes according to the test plan:
  <!-- Put your test plan here: -->
- [x] Test all of the latest grok models to make sure they work and they
do!

<img width="1089" height="714" alt="image"
src="https://github.com/user-attachments/assets/0d1e3984-69e8-432b-982a-b04c16bc4f41"
/>

Author: Bentlybro

autogpt_platform/backend/backend/blocks/llm.py

@@ -152,6 +152,9 @@ class LlmModel(str, Enum, metaclass=LlmModelMeta):
     META_LLAMA_4_SCOUT = "meta-llama/llama-4-scout"
     META_LLAMA_4_MAVERICK = "meta-llama/llama-4-maverick"
     GROK_4 = "x-ai/grok-4"
+    GROK_4_FAST = "x-ai/grok-4-fast"
+    GROK_4_1_FAST = "x-ai/grok-4.1-fast"
+    GROK_CODE_FAST_1 = "x-ai/grok-code-fast-1"
     KIMI_K2 = "moonshotai/kimi-k2"
     QWEN3_235B_A22B_THINKING = "qwen/qwen3-235b-a22b-thinking-2507"
     QWEN3_CODER = "qwen/qwen3-coder"
@@ -277,6 +280,9 @@ def max_output_tokens(self) -> int | None:
     LlmModel.META_LLAMA_4_SCOUT: ModelMetadata("open_router", 131072, 131072),
     LlmModel.META_LLAMA_4_MAVERICK: ModelMetadata("open_router", 1048576, 1000000),
     LlmModel.GROK_4: ModelMetadata("open_router", 256000, 256000),
+    LlmModel.GROK_4_FAST: ModelMetadata("open_router", 2000000, 30000),
+    LlmModel.GROK_4_1_FAST: ModelMetadata("open_router", 2000000, 30000),
+    LlmModel.GROK_CODE_FAST_1: ModelMetadata("open_router", 256000, 10000),
     LlmModel.KIMI_K2: ModelMetadata("open_router", 131000, 131000),
     LlmModel.QWEN3_235B_A22B_THINKING: ModelMetadata("open_router", 262144, 262144),
     LlmModel.QWEN3_CODER: ModelMetadata("open_router", 262144, 262144),

autogpt_platform/backend/backend/data/block_cost_config.py

@@ -116,6 +116,9 @@
     LlmModel.LLAMA_API_LLAMA3_3_8B: 1,
     LlmModel.LLAMA_API_LLAMA3_3_70B: 1,
     LlmModel.GROK_4: 9,
+    LlmModel.GROK_4_FAST: 1,
+    LlmModel.GROK_4_1_FAST: 1,
+    LlmModel.GROK_CODE_FAST_1: 1,
     LlmModel.KIMI_K2: 1,
     LlmModel.QWEN3_235B_A22B_THINKING: 1,
     LlmModel.QWEN3_CODER: 9,