Add gpt-5.4-codex and gpt-5.4-thinking

[EthantLu]

Hi, gpt-5.4-codex and gpt-5.4-thinking are released, could you please add these models ?
Thanks for your hard work!

[RayBytes]

hey, GPT-5.4 has already been added. I don't see any GPT-5.4-Codex release though.