GPT-5.6 Sol

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The cut applies for three months to API and credit usage for the model.

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OpenAI Codex engineer Tibo Sottiaux posted configuration steps to unlock the larger window for ChatGPT accounts.

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The mode launches first via the OpenAI API to a select group of customers.

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Users share benchmark results and integration updates for the new xAI model.

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OpenAI Codex lead Tibo resets paid account limits to mark GPT-5.6 Sol release.

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OpenAI expands access to GPT-5.6 Sol and Luna while adding a reasoning slider for ChatGPT users.

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Major API pricing adjustments follow efficiency gains amid intensifying AI competition.

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OpenAI engineers show retained reasoning and compaction lift base model results on complex tasks.

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Post-deployment self-optimization delivered kernel and speculative-decoding gains on the production model.