LM Studio (Local)

LM Studio provides local model execution with an OpenAI-compatible API and a GUI model manager.

Requirements

• LM Studio installed.
• A model downloaded and loaded.

Setup

1. Install LM Studio from lmstudio.ai.
2. Load a model.
3. Start local server (Developer -> Start Server).
4. Configure in AI Backend settings tab.

Configuration

Setting	Default	Description
Preferred Backend	lmstudio	Select backend.
LM Studio URL	http://127.0.0.1:1234	Server API base URL.
LM Studio Model	lmstudio	Model identifier.
LM Studio API Key	(empty)	Optional bearer token.
LM Studio Headers	(empty)	Extra headers (Header: value).
LM Studio Auto-Start	On	Start server command automatically.
LM Studio Server Command	lms server start	Auto-start command.
LM Studio Timeout	120	Request timeout in seconds.

Notes

Use Auto-Start only if your LM Studio server command is stable in the same runtime environment as Burp.

Output Token Limits

The extension sets max_tokens per request type to bound output and reduce avoidable truncation:

Request Type	max_tokens
Chat	4096
Scanner (single request)	2048
Scanner (batch analysis)	4096
Payload generation	1024

Troubleshooting

• Connection refused: verify server is running and URL/port match.
• Model not found: confirm model ID from LM Studio server logs.
• Timeouts: increase timeout or use smaller model.
• Slow responses: local hardware constraints are expected on CPU-only setups.

Retry Behavior

If a request throws a classified transient transport exception, the extension makes up to 6 total attempts with five possible delays (500/1000/1500/2000/3000 ms). The connection's circuit breaker opens after 5 recorded transient failures and allows one half-open model request after 30 seconds. Each actual retry is logged in the AI Request Logger. See Backends Overview → Retry Behavior.

Related Pages

• Backends Overview
• Troubleshooting