GPT-6 Luna and GPT-6.1 Sol save files again

When your chat runs on GPT-6 Luna or GPT-6.1 Sol, the agent now creates and rewrites files in your project as expected.

• New files get written. Before, these models could not save a file: the agent tried again and again, and the file never appeared. Edits to files that already existed were not affected.
• A rejected step says so. If the agent's attempt to save a file is refused, the chat now shows that the step did not go through, and the agent sees why on its next turn instead of repeating the same attempt.