You had to use your own key for o3 at least.

> Note that BYOK is required for this model. Set up here: https://openrouter.ai/settings/integrations

https://openrouter.ai/api/v1/models

> {"id":"openai/gpt-5-chat","canonical_slug":"openai/gpt-5-chat-2025-08-07","hugging_face_id":"","name":"OpenAI: GPT-5 Chat","created":1754587837,"description":"GPT-5 Chat is designed for advanced, natural, multimodal, and context-aware conversations for enterprise applications.","context_length":400000,"architecture":{"modality":"text+image->text","input_modalities":["file","image","text"],"output_modalities":["text"],"tokenizer":"GPT","instruct_type":null},"pricing":{"prompt":"0.00000125","completion":"0.00001","request":"0","image":"0","audio":"0","web_search":"0","internal_reasoning":"0","input_cache_read":"0.000000125"},"top_provider":{"context_length":400000,"max_completion_tokens":128000,"is_moderated":true},"per_request_limits":null,"supported_parameters":["max_tokens","response_format","seed","structured_outputs"]},

If you look at the JSON you linked, it does not enforce BYOK for openai/gpt-5-chat, nor for openai/gpt-5-mini or openai/gpt-5-nano.

Did I say GPT-5? I said o3. :) That was a rebuttal to you saying you have never needed to add your key to use an OpenAI model before.

Fair, I should not have said "any".

It does for the model this thread is about: openai/gpt-5.

What's openai/gpt-5 vs openai/gpt-5-chat?