feat(registry): add openai reasoning-family fallback generalization

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

litellm/model_prices_and_context_window_backup.json

@@ -57470,6 +57470,14 @@
                 "model_info": {
                     "supports_reasoning": true
                 }
+            },
+            {
+                "name": "openai-reasoning-family-baseline",
+                "pattern": "^(?!.*search-api)(?:[a-z0-9_.-]+/)*(?:ft:)?(?:o[1-9]\\d*(?![a-z0-9])|gpt-(?:[5-9]|[1-9]\\d)(?:\\.\\d+)?(?![0-9.])|(?:[a-z0-9.-]+-)?(?:codex|deep-research|chat-latest))",
+                "description": "OpenAI reasoning families by id shape, under any provider namespace and with an optional ft: prefix: the o-series (o1, o3-pro, o4-mini), any gpt-5 or later major including dotted minors and suffixed variants (gpt-5.5-cyber, gpt-6-astra), and the codex, deep-research and chat-latest lines. gpt-5-search-api is excluded because it is a search-only surface. Every model here is a reasoning model, and the Responses API drops the caller's reasoning param for any mapped OpenAI model whose info lacks supports_reasoning, so an id the registry has not named yet keeps its reasoning settings instead of silently losing them. Rules lose to exact entries. Carries no mode and no pricing, so cost stays on the standard unpriced behavior.",
+                "model_info": {
+                    "supports_reasoning": true
+                }
             }
         ]
     },

model_prices_and_context_window.json

@@ -57470,6 +57470,14 @@
                 "model_info": {
                     "supports_reasoning": true
                 }
+            },
+            {
+                "name": "openai-reasoning-family-baseline",
+                "pattern": "^(?!.*search-api)(?:[a-z0-9_.-]+/)*(?:ft:)?(?:o[1-9]\\d*(?![a-z0-9])|gpt-(?:[5-9]|[1-9]\\d)(?:\\.\\d+)?(?![0-9.])|(?:[a-z0-9.-]+-)?(?:codex|deep-research|chat-latest))",
+                "description": "OpenAI reasoning families by id shape, under any provider namespace and with an optional ft: prefix: the o-series (o1, o3-pro, o4-mini), any gpt-5 or later major including dotted minors and suffixed variants (gpt-5.5-cyber, gpt-6-astra), and the codex, deep-research and chat-latest lines. gpt-5-search-api is excluded because it is a search-only surface. Every model here is a reasoning model, and the Responses API drops the caller's reasoning param for any mapped OpenAI model whose info lacks supports_reasoning, so an id the registry has not named yet keeps its reasoning settings instead of silently losing them. Rules lose to exact entries. Carries no mode and no pricing, so cost stays on the standard unpriced behavior.",
+                "model_info": {
+                    "supports_reasoning": true
+                }
             }
         ]
     },

tests/test_litellm/litellm_core_utils/test_fallback_generalizations.py

@@ -677,3 +677,34 @@ def test_deployment_model_info_beats_the_seeded_rule_defaults(shipped_cost_map):
 
     assert litellm.model_cost[model]["supports_reasoning"] is False
     assert litellm.supports_reasoning(model="some-org/NoThink-1", custom_llm_provider="wandb") is False
+
+
+def test_shipped_rules_flag_unmapped_openai_reasoning_families(shipped_cost_map):
+    """OpenAI ships reasoning families faster than this registry names them. Any id in
+    the o-series, gpt-5+ major, codex, deep-research or chat-latest shape resolves as
+    reasoning-capable through the rule, under any provider namespace and an optional
+    ft: prefix, so the Responses API keeps the caller's reasoning settings instead of
+    silently dropping them."""
+    for model in ("gpt-5.7-nova", "openai/gpt-6", "ft:gpt-5.1-2025-11-13:org::abc", "o5-mini", "gpt-5.6-codex-max", "o4-mini-deep-research-2027-01-01", "gpt-5.7-chat-latest", "azure/gpt-5.7-cyber"):
+        assert model not in litellm.model_cost, model
+        assert match_capability_generalizations(model) == {"supports_reasoning": True}, model
+    info = litellm.get_model_info("gpt-5.7-nova", custom_llm_provider="openai")
+    assert info["litellm_provider"] == "openai"
+    assert info["supports_reasoning"] is True
+    assert info.get("mode") is None
+    assert not info.get("input_cost_per_token")
+    assert litellm.supports_reasoning(model="gpt-5.7-nova", custom_llm_provider="openai") is True
+
+
+def test_shipped_openai_reasoning_rule_skips_non_reasoning_gpt_ids(shipped_cost_map):
+    """The rule is gated on the reasoning-family shapes, so gpt-4.x, gpt-oss, realtime,
+    image, moderation, embedding and search-api ids all stay unflagged."""
+    for model in ("gpt-4o", "gpt-4.1-nano-new", "gpt-oss-120b", "gpt-realtime-2027", "gpt-image-2", "gpt-5-search-api-2027-01-01", "omni-moderation-new", "text-embedding-4"):
+        assert match_capability_generalizations(model) is None, model
+
+
+def test_shipped_openai_reasoning_rule_loses_to_mapped_entries(shipped_cost_map):
+    """Rules lose to exact entries: gpt-5-search-api is mapped non-reasoning, and the
+    search-api negative lookahead keeps the rule from flagging it anyway."""
+    assert "gpt-5-search-api" in litellm.model_cost
+    assert litellm.supports_reasoning(model="gpt-5-search-api", custom_llm_provider="openai") is False