2026-09-23 16:44:53.437 main LOG [llm] → Custom endpoint models: https://api.deepseek.com/v1/models
2026-09-23 16:44:58.757 main LOG [llm] → Custom endpoint deepseek-flash (thinking=medium, tier=standard, maxTokens=65536, schema=connection_test)
2026-09-23 16:44:58.757 main LOG [llm] → system: (truncated, 20 chars)
2026-09-23 16:44:58.757 main LOG [llm] → user: Ping.
2026-09-23 16:44:59.089 main LOG [llm] ✕ Custom endpoint deepseek-flash HTTP 400 after 332ms
2026-09-23 16:44:59.089 main ERROR [ipc] llm:testWriter failed: {
code: 'LLM_REQUEST_REJECTED',
message: 'Custom endpoint rejected the request (HTTP 400).',
detail: 'invalid_request_error This response_format type is unavailable now'
}