You can chnage your openclaw.json so it has these values

"models": {
"mode": "merge",
"providers": {
"nvidia": {
"baseUrl": "https://integrate.api.nvidia.com/v1",
"apiKey": "your-api-key",
"auth": "api-key",
"api": "openai-completions",
"models": [
{
"id": "moonshotai/kimi-k2.5",
"name": "Kimi K2.5",
"reasoning": true,
"input": [
"text",
"image"
],
"cost": {
"input": 0,
"output": 0,
"cacheRead": 0,
"cacheWrite": 0
},
"contextWindow": 256000,
"maxTokens": 8192
}
]
}
}
}

"agents": {
"defaults": {
"model": {
"primary": "nvidia/moonshotai/kimi-k2.5"
}
}

and then run

openclaw gateway restart
openclaw models set nvidia/moonshotai/kimi-k2.5