From 5a4297a11a83c38ac24eec7df0e4e41d6b3dbb9f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=BE=BE=E4=BB=A4=E5=B0=8F=E6=96=B0?=
 <xiaoxingitee@gmail.com>
Date: Tue, 9 Jun 2026 03:25:05 +0800
Subject: [PATCH] fix(model_metadata): prefer hardcoded 1M for MiniMax M3 over
 stale models.dev probe

---
 agent/model_metadata.py | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/agent/model_metadata.py b/agent/model_metadata.py
index b2c5a1c9fe8..3a71e974fdb 100644
--- a/agent/model_metadata.py
+++ b/agent/model_metadata.py
@@ -1838,6 +1838,17 @@ def get_model_context_length(
         from agent.models_dev import lookup_models_dev_context
         ctx = lookup_models_dev_context(effective_provider, model)
         if ctx:
+            # MiniMax M3: models.dev reports 512K but actual context is 1M.
+            # Prefer hardcoded catalog over stale probe value.
+            if _model_name_suggests_minimax_m3(model):
+                catalog = DEFAULT_CONTEXT_LENGTHS.get("minimax-m3")
+                if catalog and ctx < catalog:
+                    logger.info(
+                        "Rejecting models.dev context=%s for %r "
+                        "(MiniMax-M3 underreport); using hardcoded default %s",
+                        ctx, model, f"{catalog:,}",
+                    )
+                    ctx = catalog
             return ctx
 
     # 6. OpenRouter live API metadata — provider-unaware fallback.