chore: replace gpt-4o-mini with gpt-5-nano everywhere

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.env.example

@@ -95,9 +95,9 @@ OPENROUTER_API_KEY=sk-or-v1-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
 
 # Default model for new conversations (must exist in your configured provider).
 #
-# [OPTIONAL]  Examples: openai/gpt-4o-mini, openrouter/deepseek/deepseek-chat:free
+# [OPTIONAL]  Examples: openai/gpt-5-nano, openrouter/deepseek/deepseek-chat:free
 #
-# OPENCLAW_DEFAULT_MODEL=openai/gpt-4o-mini
+# OPENCLAW_DEFAULT_MODEL=openai/gpt-5-nano
 
 
 # ─── PERFORMANCE ──────────────────────────────────────────────────────────

README.md

@@ -85,7 +85,7 @@ Go to **Settings → Repository secrets** and configure:
 | `OPENROUTER_API_KEY` | Optional | [OpenRouter](https://openrouter.ai) API key (200+ models, free tier) |
 | `ANTHROPIC_API_KEY` | Optional | Anthropic Claude API key |
 | `GOOGLE_API_KEY` | Optional | Google / Gemini API key |
-| `OPENCLAW_DEFAULT_MODEL` | Optional | Default model, e.g. `openrouter/openai/gpt-oss-20b:free` or `openai/gpt-4o-mini` |
+| `OPENCLAW_DEFAULT_MODEL` | Optional | Default model, e.g. `openrouter/openai/gpt-oss-20b:free` or `openai/gpt-5-nano` |
 
 > For the full list of environment variables, see [`.env.example`](.env.example).
 

scripts/sync_hf.py

@@ -69,7 +69,7 @@ OPENCLAW_PASSWORD = os.environ.get("OPENCLAW_PASSWORD", "huggingclaw")
 
 # Default model for new conversations (infer from provider if not set)
 OPENCLAW_DEFAULT_MODEL = os.environ.get("OPENCLAW_DEFAULT_MODEL") or (
-    "openai/gpt-4o-mini" if OPENAI_API_KEY else "openrouter/openai/gpt-oss-20b:free"
+    "openai/gpt-5-nano" if OPENAI_API_KEY else "openrouter/openai/gpt-oss-20b:free"
 )
 
 # HF Spaces built-in env vars (auto-set by HF runtime)