Json

GPT-4o returns JSON with trailing comma in tool call While parsing function‑call output from GPT‑4o the JSON loader threw: json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 98 (char 97) The model emitted: { "name": "getStockPrice", "arguments": { "ticker": "AMD", }, "id": "abc" } Note the trailing comma after "AMD". Added a pre‑parse scrub: import re, json clean = re.sub(r",\s*([}\]])", r"\1", raw) data = json.loads(clean) Also set response_format={"type":"json_object"} in the request; 4o obeys the flag half the time.

OpenRouter API response missing ’text’ in JSON payload Testing OpenRouter with gpt‑4 turbo. Request looked fine but the completion field came back empty: { "id":"chatcmpl-xxxx", "choices":[ {"index":0,"logprobs":null,"finish_reason":"stop"} ], "model":"gpt-4-turbo-preview", "usage":{...} } No choices[0].message.content. cURL request: curl https://openrouter.ai/api/v1/chat/completions -H "Authorization: Bearer $OPENROUTER_KEY" -H "Content-Type: application/json" -d '{"model":"gpt-4-turbo-preview","messages":[{"role":"user","content":"hi"}]}' Turns out OpenRouter now requires the header HTTP-Referer (your site) and X-Title (app name) for non‑localhost keys.