OpenAI has released GPT-5.6, a new family of three models: Sol, Terra, and Luna, all optimized for agentic tool calling. Launched on July 9, 2026, these models share a 1 million token context window and a 128K max output, with varying costs and reasoning capabilities. The key innovation is Programmatic Tool Calling, which allows models to chain tool calls in a single script, reducing token usage and improving efficiency for agents. GPT-5.6 also features an ultra multi-agent mode that enhances performance on complex tasks. AI
IMPACT Sets a new standard for agentic tool calling with tiered models and programmatic execution, potentially lowering costs and increasing efficiency for AI agents.
RANK_REASON Frontier-lab model release with system card. [lever_c_demoted from frontier_release: ic=1 ai=1.0]
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