feat(/model): merge models.dev entries for lesser-loved providers (#14221)

New and newer models from models.dev now surface automatically in
/model (both hermes model CLI and the gateway Telegram/Discord picker)
for a curated set of secondary providers — no Hermes release required
when the registry publishes a new model.

Primary user-visible fix: on OpenCode Go, typing '/model mimo-v2.5-pro'
no longer silently fuzzy-corrects to 'mimo-v2-pro'. The exact match
against the merged models.dev catalog wins.

Scope (opt-in frozenset _MODELS_DEV_PREFERRED in hermes_cli/models.py):
  opencode-go, opencode-zen, deepseek, kilocode, fireworks, mistral,
  togetherai, cohere, perplexity, groq, nvidia, huggingface, zai,
  gemini, google.

Explicitly NOT merged:
  - openrouter and nous (never): curated list is already a hand-picked
    subset / Portal is source of truth.
  - xai, xiaomi, minimax, minimax-cn, kimi-coding, kimi-coding-cn,
    alibaba, qwen-oauth (per-project decision to keep curated-only).
  - providers with dedicated live-endpoint paths (copilot, anthropic,
    ai-gateway, ollama-cloud, custom, stepfun, openai-codex) — those
    paths already handle freshness themselves.

Changes:
  - hermes_cli/models.py: add _MODELS_DEV_PREFERRED + _merge_with_models_dev
    helper. provider_model_ids() branches on the set at its curated-fallback
    return. Merge is models.dev-first, curated-only extras appended,
    case-insensitive dedup, graceful fallback when models.dev is offline.
  - hermes_cli/model_switch.py: list_authenticated_providers() calls the
    same merge in both its code paths (PROVIDER_TO_MODELS_DEV loop +
    HERMES_OVERLAYS loop). Picker AND validation-fallback both see
    fresh entries.
  - tests/hermes_cli/test_models_dev_preferred_merge.py (new): 13 tests —
    merge-helper unit tests (empty/raise/order/dedup), opencode-go/zen
    behavior, openrouter+nous explicitly guarded from merge.
  - tests/hermes_cli/test_opencode_go_in_model_list.py: converted from
    snapshot-style assertion to a behavior-based floor check, so it
    doesn't break when models.dev publishes additional opencode-go
    entries.

Addresses a report from @pfanis via Telegram: newer Xiaomi variants
on OpenCode Go weren't appearing in the /model picker, and /model
was silently routing requests for new variants to older ones.

hermes_cli/model_switch.py

@@ -810,7 +810,10 @@ def list_authenticated_providers(
         get_provider_info as _mdev_pinfo,
     )
     from hermes_cli.auth import PROVIDER_REGISTRY
-    from hermes_cli.models import OPENROUTER_MODELS, _PROVIDER_MODELS
+    from hermes_cli.models import (
+        OPENROUTER_MODELS, _PROVIDER_MODELS,
+        _MODELS_DEV_PREFERRED, _merge_with_models_dev,
+    )
 
     results: List[dict] = []
     seen_slugs: set = set()  # lowercase-normalized to catch case variants (#9545)
@@ -856,8 +859,13 @@ def list_authenticated_providers(
         if not has_creds:
             continue
 
-        # Use curated list, falling back to models.dev if no curated list
+        # Use curated list, falling back to models.dev if no curated list.
+        # For preferred providers, merge models.dev entries into the curated
+        # catalog so newly released models (e.g. mimo-v2.5-pro on opencode-go)
+        # show up in the picker without requiring a Hermes release.
         model_ids = curated.get(hermes_id, [])
+        if hermes_id in _MODELS_DEV_PREFERRED:
+            model_ids = _merge_with_models_dev(hermes_id, model_ids)
         total = len(model_ids)
         top = model_ids[:max_models]
 
@@ -961,6 +969,9 @@ def list_authenticated_providers(
 
         # Use curated list — look up by Hermes slug, fall back to overlay key
         model_ids = curated.get(hermes_slug, []) or curated.get(pid, [])
+        # Merge with models.dev for preferred providers (same rationale as above).
+        if hermes_slug in _MODELS_DEV_PREFERRED:
+            model_ids = _merge_with_models_dev(hermes_slug, model_ids)
         total = len(model_ids)
         top = model_ids[:max_models]
 

hermes_cli/models.py

@@ -1589,11 +1589,84 @@ def _resolve_copilot_catalog_api_key() -> str:
         return ""
 
 
+# Providers where models.dev is treated as authoritative: curated static
+# lists are kept only as an offline fallback and to capture custom additions
+# the registry doesn't publish yet. Adding a provider here causes its
+# curated list to be merged with fresh models.dev entries (fresh first, any
+# curated-only names appended) for both the CLI and the gateway /model picker.
+#
+# DELIBERATELY EXCLUDED:
+#   - "openrouter": curated list is already a hand-picked agentic subset of
+#     OpenRouter's 400+ catalog. Blindly merging would dump everything.
+#   - "nous": curated list and Portal /models endpoint are the source of
+#     truth for the subscription tier.
+# Also excluded: providers that already have dedicated live-endpoint
+# branches below (copilot, anthropic, ai-gateway, ollama-cloud, custom,
+# stepfun, openai-codex) — those paths handle freshness themselves.
+_MODELS_DEV_PREFERRED: frozenset[str] = frozenset({
+    "opencode-go",
+    "opencode-zen",
+    "deepseek",
+    "kilocode",
+    "fireworks",
+    "mistral",
+    "togetherai",
+    "cohere",
+    "perplexity",
+    "groq",
+    "nvidia",
+    "huggingface",
+    "zai",
+    "gemini",
+    "google",
+})
+
+
+def _merge_with_models_dev(provider: str, curated: list[str]) -> list[str]:
+    """Merge curated list with fresh models.dev entries for a preferred provider.
+
+    Returns models.dev entries first (in models.dev order), then any
+    curated-only entries appended. Preserves case for curated fallbacks
+    (e.g. ``MiniMax-M2.7``) while trusting models.dev for newer variants.
+
+    If models.dev is unreachable or returns nothing, the curated list is
+    returned unchanged — this is the offline/CI fallback path.
+    """
+    try:
+        from agent.models_dev import list_agentic_models
+        mdev = list_agentic_models(provider)
+    except Exception:
+        mdev = []
+
+    if not mdev:
+        return list(curated)
+
+    # Case-insensitive dedup while preserving order and curated casing.
+    seen_lower: set[str] = set()
+    merged: list[str] = []
+    for mid in mdev:
+        key = str(mid).lower()
+        if key in seen_lower:
+            continue
+        seen_lower.add(key)
+        merged.append(mid)
+    for mid in curated:
+        key = str(mid).lower()
+        if key in seen_lower:
+            continue
+        seen_lower.add(key)
+        merged.append(mid)
+    return merged
+
+
 def provider_model_ids(provider: Optional[str], *, force_refresh: bool = False) -> list[str]:
     """Return the best known model catalog for a provider.
 
     Tries live API endpoints for providers that support them (Codex, Nous),
-    falling back to static lists.
+    falling back to static lists. For providers in ``_MODELS_DEV_PREFERRED``
+    (opencode-go/zen, xiaomi, deepseek, smaller inference providers, etc.),
+    models.dev entries are merged on top of curated so new models released
+    on the platform appear in ``/model`` without a Hermes release.
     """
     normalized = normalize_provider(provider)
     if normalized == "openrouter":
@@ -1659,7 +1732,10 @@ def provider_model_ids(provider: Optional[str], *, force_refresh: bool = False)
             live = fetch_api_models(api_key, base_url)
             if live:
                 return live
-    return list(_PROVIDER_MODELS.get(normalized, []))
+    curated_static = list(_PROVIDER_MODELS.get(normalized, []))
+    if normalized in _MODELS_DEV_PREFERRED:
+        return _merge_with_models_dev(normalized, curated_static)
+    return curated_static
 
 
 def _fetch_anthropic_models(timeout: float = 5.0) -> Optional[list[str]]: