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fix(model_metadata): add xAI Grok context length fallbacks

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xAI /v1/models does not return context_length metadata, so Hermes
probes down to the 128k default whenever a user configures a custom
provider pointing at https://api.x.ai/v1. This forces every xAI user
to manually override model.context_length in config.yaml (2M for
Grok 4.20 / 4.1-fast / 4-fast) or lose most of the usable context
window.

Add DEFAULT_CONTEXT_LENGTHS entries for the Grok family so the
fallback lookup returns the correct value via substring matching.
Values sourced from models.dev (2026-04) and cross-checked against
the xAI /v1/models listing:

  - grok-4.20-*          2,000,000  (reasoning, non-reasoning, multi-agent)
  - grok-4-1-fast-*      2,000,000
  - grok-4-fast-*        2,000,000
  - grok-4 / grok-4-0709   256,000
  - grok-code-fast-1       256,000
  - grok-3*                131,072
  - grok-2 / latest        131,072
  - grok-2-vision*           8,192
  - grok (catch-all)       131,072

Keys are ordered longest-first so that specific variants match before
the catch-all, consistent with the existing Claude/Gemma/MiniMax entries.

Add TestDefaultContextLengths.test_grok_models_context_lengths and
test_grok_substring_matching to pin the values and verify the full
lookup path. All 77 tests in test_model_metadata.py pass.
This commit is contained in:
Julien Talbot 2026-04-10 12:08:16 +04:00 • committed by Teknium
parent 5b22e61cfa
commit b577697189
2 changed files with 70 additions and 0 deletions
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15
agent/model_metadata.py
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@ -126,6 +126,21 @@ DEFAULT_CONTEXT_LENGTHS = {
"minimax": 1048576,
# GLM
"glm": 202752,
# xAI Grok — xAI /v1/models does not return context_length metadata,
# so these hardcoded fallbacks prevent Hermes from probing-down to
# the default 128k when the user points at https://api.x.ai/v1
# via a custom provider. Values sourced from models.dev (2026-04).
# Keys use substring matching (longest-first), so e.g. "grok-4.20"
# matches "grok-4.20-0309-reasoning" / "-non-reasoning" / "-multi-agent-0309".
"grok-code-fast": 256000, # grok-code-fast-1
"grok-4-1-fast": 2000000, # grok-4-1-fast-(non-)reasoning
"grok-2-vision": 8192, # grok-2-vision, -1212, -latest
"grok-4-fast": 2000000, # grok-4-fast-(non-)reasoning
"grok-4.20": 2000000, # grok-4.20-0309-(non-)reasoning, -multi-agent-0309
"grok-4": 256000, # grok-4, grok-4-0709
"grok-3": 131072, # grok-3, grok-3-mini, grok-3-fast, grok-3-mini-fast
"grok-2": 131072, # grok-2, grok-2-1212, grok-2-latest
"grok": 131072, # catch-all (grok-beta, unknown grok-*)
# Kimi
"kimi": 262144,
# Arcee

55
tests/agent/test_model_metadata.py
View file

@ -132,6 +132,61 @@ class TestDefaultContextLengths:
if "gemini" in key:
assert value == 1048576, f"{key} should be 1048576"
def test_grok_models_context_lengths(self):
# xAI /v1/models does not return context_length metadata, so
# DEFAULT_CONTEXT_LENGTHS must cover the Grok family explicitly.
# Values sourced from models.dev (2026-04).
expected = {
"grok-4.20": 2000000,
"grok-4-1-fast": 2000000,
"grok-4-fast": 2000000,
"grok-4": 256000,
"grok-code-fast": 256000,
"grok-3": 131072,
"grok-2": 131072,
"grok-2-vision": 8192,
"grok": 131072,
}
for key, value in expected.items():
assert key in DEFAULT_CONTEXT_LENGTHS, f"{key} missing from DEFAULT_CONTEXT_LENGTHS"
assert DEFAULT_CONTEXT_LENGTHS[key] == value, (
f"{key} should be {value}, got {DEFAULT_CONTEXT_LENGTHS[key]}"
)
def test_grok_substring_matching(self):
# Longest-first substring matching must resolve the real xAI model
# IDs to the correct fallback entries without 128k probe-down.
from agent.model_metadata import get_model_context_length
from unittest.mock import patch as mock_patch
# Fake the provider/API/cache layers so the lookup falls through
# to DEFAULT_CONTEXT_LENGTHS.
with mock_patch("agent.model_metadata.fetch_model_metadata", return_value={}), mock_patch("agent.model_metadata.fetch_endpoint_model_metadata", return_value={}), mock_patch("agent.model_metadata.get_cached_context_length", return_value=None):
cases = [
("grok-4.20-0309-reasoning", 2000000),
("grok-4.20-0309-non-reasoning", 2000000),
("grok-4.20-multi-agent-0309", 2000000),
("grok-4-1-fast-reasoning", 2000000),
("grok-4-1-fast-non-reasoning", 2000000),
("grok-4-fast-reasoning", 2000000),
("grok-4-fast-non-reasoning", 2000000),
("grok-4", 256000),
("grok-4-0709", 256000),
("grok-code-fast-1", 256000),
("grok-3", 131072),
("grok-3-mini", 131072),
("grok-3-mini-fast", 131072),
("grok-2", 131072),
("grok-2-vision", 8192),
("grok-2-vision-1212", 8192),
("grok-beta", 131072),
]
for model_id, expected_ctx in cases:
actual = get_model_context_length(model_id)
assert actual == expected_ctx, (
f"{model_id}: expected {expected_ctx}, got {actual}"
)
def test_all_values_positive(self):
for key, value in DEFAULT_CONTEXT_LENGTHS.items():
assert value > 0, f"{key} has non-positive context length"