OpenAI has launched GPT-5.6 with models Sol, Terra, and Luna across ChatGPT, Codex, and its API. GPT-5.6 Sol introduces a four-agent reasoning system and higher-compute modes. OpenAI confirms SpaceXAI will release Grok 4.5, intensifying competition in the advanced AI models market. Pricing for the API starts at $5 per one million input tokens for Sol.

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